Tokushima University / Educator and Researcher Directory --- Okamura, Yasuhiro

Personal Web Page

https://researchmap.jp/y-okamura (researchmap)

Field of Study

○	Communication Engineering

Subject of Study

○	Optical communication technologies (multi-level modulated optical signals, optical signal processing, optical code division multiplexing, phase-sensitive optical amplification, digital signal processing, optical communication, coherent optical communication)

Book / Paper

Book:

1.	Yoshiyasu Ishimaru, Shin-ichi Ito, Takeshi Uno, Yasuhiro Okamura, Kenji Ohira, Kosuke Ono, Hidekazu Kakei, Kazuhide Kanenishi, Maiko Sawada, Toru Hasunuma, Ray S. Furuya, Kenji Matsuura, Kazuyuki Matsumoto, 土岐順子, 阿部香織, 山﨑紅, 辰巳丈夫 and 勝村幸博 : 情報科学入門, 日経BP社, Tokyo, Apr. 2019.
2.	Yoshiyasu Ishimaru, Shin-ichi Ito, Takeshi Uno, Yasuhiro Okamura, Kenji Ohira, Kosuke Ono, Hidekazu Kakei, Kazuhide Kanenishi, Maiko Sawada, Toru Hasunuma, Ray S. Furuya, Kenji Matsuura, Kazuyuki Matsumoto, 土岐順子, 阿部香織, 山﨑紅, 辰巳丈夫 and 勝村幸博 : 情報科学入門, 日経BP社, Tokyo, Apr. 2018.
3.	Yoshiyasu Ishimaru, Shin-ichi Ito, Takeshi Uno, Yasuhiro Okamura, Kenji Ohira, Kosuke Ono, Hidekazu Kakei, Kazuhide Kanenishi, Maiko Sawada, Toru Hasunuma, Ray S. Furuya, Kenji Matsuura, Kazuyuki Matsumoto, 土岐順子, 阿部香織, 山﨑紅, 辰巳丈夫 and 勝村幸博 : 情報科学入門, 日経BP社, Tokyo, Apr. 2017.

Academic Paper (Judged Full Paper):

1.	Yu Tokizane, Shota Okada, Takumi Kikuhara, Hiroki Kishikawa, Yasuhiro Okamura, Yoshihiro Makimoto, Kenji Nishimoto, Takeo Minamikawa, Eiji Hase, Junichi Fujikata, Masanobu Haraguchi, Atsushi Kann, Shintaro Hisatake, Naoya Kuse and Takeshi Yasui : Wireless data transmission in the 560-GHz band utilizing terahertz wave generated through photomixing of a pair of distributed feedback lasers injection-locking to a Kerr micro-resonator soliton comb, Optics Continuum, Vol.3, No.1, 1-8, 2024. (Link to Publication Site) ● Publication site (DOI): 10.1364/OPTCON.504431 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OPTCON.504431 (DOI: 10.1364/OPTCON.504431)
2.	Yudai Matsumura, Yu Tokizane, Eiji Hase, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Isao Morohashi, Atsushi Kannno, Shintaro Hisatake and Takeshi Yasui : Carrier conversion from terahertz wave to dual-wavelength near-infrared light for photonic terahertz detection in wireless communication, Optics Express, Vol.31, No.20, 33103-33112, 2023. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.499472 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OE.499472 (DOI: 10.1364/OE.499472)
3.	Yu Tokizane, Shota Okada, Kenji Nishimoto, Yasuhiro Okamura, Hiroki Kishikawa, Takeo Minamikawa, Eiji Hase, Junichi Fujikata, Masanobu Haraguchi, Atsushi Kanno, Shintaro Hisatake, Naoya Kuse and Takeshi Yasui : Terahertz wireless communication in a 560-GHz band using a Kerr micro-resonator soliton comb, Optics Continuum, Vol.2, No.5, 1267-1275, 2023. (Tokushima University Institutional Repository) ● Metadata: 118500 (Link to Publication Site) ● Publication site (DOI): 10.1364/OPTCON.491729 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1364/OPTCON.491729 (Tokushima University Institutional Repository: 118500, DOI: 10.1364/OPTCON.491729)
4.	Yasuhiro Okamura and Atsushi Takada : Effect of shift in refractive index of dispersive elements in waveband-shift-free optical phase conjugator based on DFG, Optical Review, Vol.28, No.2, 174-180, 2021. (Tokushima University Institutional Repository) ● Metadata: 115629 (Link to Publication Site) ● Publication site (DOI): 10.1007/s10043-021-00647-7 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10043-021-00647-7 (Tokushima University Institutional Repository: 115629, DOI: 10.1007/s10043-021-00647-7)
5.	Yasuhiro Okamura and Atsushi Takada : Waveband-shift-free optical phase conjugator based on difference-frequency generation, Optics Express, Vol.28, No.5, 7596-7606, 2020. (Summary) In this paper, a waveband-shift-free optical phase conjugator based on difference-frequency generation (DFG-OPC) that enables broadband operation is proposed and theoretically investigated. First, the principle of phase-conjugated (PC) wave generation with the DFG-OPC is mathematically described. Using a Sagnac loop interferometer with a χ optical nonlinear material and two dispersive elements (DEs), a PC wave with the same wavelength as a signal can be generated. Subsequently, the required DE length difference for the PC wave generation is theoretically calculated. The calculation results indicate the minimal DE length difference is 20.0 μm, and this is because the DFG-OPC enables broadband operation. Second, the wavelength characteristics of the DFG-OPC are investigated through numerical simulation. The operation bandwidth of the DFG-OPC depends on the DE length difference, and an operating bandwidth of the DFG-OPC of 54.5 nm can be achieved when the DE length difference is less than 0.01 m. Finally, the influence of the splitting ratio of an optical 3-dB coupler in the DFG-OPC is numerically studied. The results indicate that tolerance of the optical coupler splitting ratio is equal to or less than ±6% for the DFG-OPC. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.387590 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 32225984 ● Summary page in Scopus @ Elsevier: 2-s2.0-85081126658 (DOI: 10.1364/OE.387590, PubMed: 32225984, Elsevier: Scopus)
6.	Takushi Kazama, Takeshi Umeki, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Atsushi Takada and Ryoichi Kasahara : PPLN-based Low-noise Phase Sensitive Amplification Using an Optical Phase-locked Pump, IEICE Transactions on Communications, 2020. (Link to Publication Site) ● Publication site (DOI): 10.1587/transcom.2019OBP0005 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1587/transcom.2019OBP0005 (DOI: 10.1587/transcom.2019OBP0005)
7.	Yasuhiro Okamura and Atsushi Takada : Simultaneous carrier extraction from wavelength-division-multiplexed phase-conjugated twin waves by using sum-frequency generation with second-order optical nonlinear medium for phase-sensitive optical amplifier repeaters, Japanese Journal of Applied Physics, Part 1 (Special Issues), Vol.58, 2019. (Link to Publication Site) ● Publication site (DOI): 10.7567/1347-4065/ab27b4 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85072834243 (DOI: 10.7567/1347-4065/ab27b4, Elsevier: Scopus)
8.	Kimura Takeshi, Yasuhiro Okamura and Atsushi Takada : Optical QPSK Signal Quality Degradation due to Phase Error of Pump Light in Optical Parametric Phase-Sensitive Amplifier Repeaters, IEICE Transactions on Communications, Vol.E102-B, No.4, 810-817, 2019. (Tokushima University Institutional Repository) ● Metadata: 113285 (Link to Publication Site) ● Publication site (DOI): 10.1587/transcom.2018EBP3085 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85064004248 (Tokushima University Institutional Repository: 113285, DOI: 10.1587/transcom.2018EBP3085, Elsevier: Scopus)
9.	Yasuhiro Okamura, Ikuya Nagatomi and Atsushi Takada : Polarization Dependence of Carrier Extraction from Dual-Polarization Phase-Conjugated Twin Waves with Sum-Frequency Generation, The Review of Laser Engineering, Vol.46, No.6, 326-330, 2018. (Tokushima University Institutional Repository) ● Metadata: 113286 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050282813437683584 (Tokushima University Institutional Repository: 113286, CiNii: 1050282813437683584)
10.	Yasuhiro Okamura, Masashi Abe, Kotaro Kondo, Yuya Ohmichi, Takushi Kazama, Takeshi Umeki, Masafumi Koga and Atsushi Takada : Optical pump phase locking to a carrier wave extracted from phase-conjugated twin waves for phase-sensitive optical amplifier repeaters, Optics Express, Vol.24, No.23, 26300-26306, 2016. (Summary) In this paper, an optical phase-locked loop assisted by sum-frequency and second-harmonic generation (SS-OPLL) for frequency nondegenerate optical parametric phase-sensitive amplifier repeaters is experimentally demonstrated. First, theoretical derivations show that carrier extraction from phase-conjugated twin waves (PCTWs) and reference light generation are achieved by sum-frequency generation; therefore, the SS-OPLL circuit enables optical phase locking between PCTWs and a pump wave by a simple architecture based on a balanced OPLL. Then, optical phase locking between 20-Gbit/s quadrature phase-shift keying PCTWs and an individual pump source is experimentally demonstrated. Experimental results indicate that phase errors were reduced during the SS-OPLL operation. (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.24.026300 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 27857365 ● Summary page in Scopus @ Elsevier: 2-s2.0-84995426953 (DOI: 10.1364/OE.24.026300, PubMed: 27857365, Elsevier: Scopus)
11.	Yasuhiro Okamura, Osamu Iijima, Satoshi Shimizu, Naoya Wada and Masanori Hanawa : Simultaneous detection of 10-Gbit/s QPSK x 2-ch. Fourier-encoded synchronous OCDM signals with digital coherent receiver, Optics Express, Vol.21, No.3, 3298-3307, 2013. (Summary) We experimentally demonstrate the simultaneous detection of 10-Gbit/s quadrature phase shift keying (QPSK) × 2-channel Fourier-encoded synchronous optical code division multiplexing (FE-SOCDM) signals using a digital coherent receiver, for the first time. First, we analytically verify that simultaneous detection can be achieved with an N-point discrete Fourier transform (DFT) using digital signal processing (DSP) because the N-channel Fourier encoding corresponds to an N × N inverse DFT, then the operation is experimentally confirmed. Simultaneous detection of 10-Gbit/s QPSK × 2-channel FE-SOCDM signals is evaluated. The proposed scheme dramatically expands the capability of OCDM systems. (Keyword) Equipment Design / Equipment Failure Analysis / Fourier Analysis / Information Storage and Retrieval / Optical Devices / Signal Processing, Computer-Assisted / Telecommunications (Link to Publication Site) ● Publication site (DOI): 10.1364/OE.21.003298 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 23481789 ● Search Scopus @ Elsevier (PMID): 23481789 ● Search Scopus @ Elsevier (DOI): 10.1364/OE.21.003298 (DOI: 10.1364/OE.21.003298, PubMed: 23481789)
12.	Yasuhiro Okamura and 塙雅典 : ディジタルコヒーレント受信機におけるイントラダイン方式の適用可能性の検討, The Review of Laser Engineering, Vol.39, No.9, 711-716, 2011. (Keyword) Intradyne detection / ADC / Sampling rate / Digital coherent receiver / 2nd harmonic interference (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679626515072 (CiNii: 1390282679626515072)

Academic Letter:

1.	Akira Tanaka, Yasuhiro Okamura and Atsushi Takada : Amplitude Noise Suppression of BPSK Signals Using Transmission Optical Fibers and Optical Parametric Phase-Sensitive Amplifiers, IEICE Electronics Express, Vol.19, No.13, 1-5, 2022. (Keyword) phase-sensitive optical amplifier / optical Kerr effect / self-phase-modulation / amplitude noise suppression (Link to Publication Site) ● Publication site (DOI): 10.1587/elex.19.20220196 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390574181068788352 ● Summary page in Scopus @ Elsevier: 2-s2.0-85135400928 (DOI: 10.1587/elex.19.20220196, CiNii: 1390574181068788352, Elsevier: Scopus)
2.	Yasuhiro Okamura and Atsushi Takada : Dispersion compensation of wavelength-division multiplexed signals using waveband shift-free optical phase conjugators, IEICE Communications Express, Vol.11, No.1, 33-38, 2021. (Link to Publication Site) ● Publication site (DOI): 10.1587/comex.2021XBL0180 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1587/comex.2021XBL0180 (DOI: 10.1587/comex.2021XBL0180)
3.	Yasuhiro Okamura, Masashi Abe, Kotaro Kondo, Takumi Okabe, Takushi Kazama, Akihide Sano, Takeshi Umeki, Ryoichi Kasahara and Atsushi Takada : Pump phase-locking to fiber-transmitted QPSK phase-conjugated twin waves for non-degenerate phase-sensitive amplifier repeaters, IEICE Communications Express, Vol.6, No.10, 566-571, 2017. (Link to Publication Site) ● Publication site (DOI): 10.1587/comex.2017XBL0098 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1587/comex.2017XBL0098 (DOI: 10.1587/comex.2017XBL0098)
4.	Yasuhiro Okamura, Masafumi Koga and Atsushi Takada : First demonstration of phase-sensitive gain stabilization by using heterodyne Costas optical phase-locked loop, IEICE Communications Express, Vol.5, No.6, 152-157, 2016. (Link to Publication Site) ● Publication site (DOI): 10.1587/comex.2016XBL0034 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1587/comex.2016XBL0034 (DOI: 10.1587/comex.2016XBL0034)
5.	Yasuhiro Okamura and Masanori Hanawa : All Optical Generation of Optical BPSK/QPSK Signals Interleaved with Reference Light, IEEE Photonics Technology Letters, Vol.24, No.20, 1789-1791, 2012. (Link to Publication Site) ● Publication site (DOI): 10.1109/LPT.2012.2209867 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/LPT.2012.2209867 (DOI: 10.1109/LPT.2012.2209867)

Review, Commentary:

1.	Atsushi Takada, Yasuhiro Okamura and Masafumi Koga : 光パラメトリック増幅と低雑音位相感応光中継増幅, O plus E, Vol.37, No.8, 628-635, Aug. 2015. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520010379931728640 (CiNii: 1520010379931728640)

Proceeding of International Conference:

1.	Yu Tokizane, Takumi Kikuhara, Y. Makimoto, Hiroki Kishikawa, Yasuhiro Okamura, Kenji Nishimoto, A. Kanno, S. Hisatake, Naoya Kuse and Takeshi Yasui : 560 GHz wireless communication using soliton microcomb modes and photomixing with heterodyne detection, 49th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz2024),, Sep. 2024.
2.	Takumi Kikuhara, Yoshihiro Makimoto, Yu Tokizane, Naoya Kuse, Eiji Hase, Yudai Matsumura, Hiroki Kishikawa, Yasuhiro Okamura, A. Kanno, S. Hisatake and Takeshi Yasui : Baseband modulation in terahertz wave communication using micro-optical comb, 16th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR2024), Aug. 2024.
3.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, T. Kaji, A. Otomo, I. Morohashi, A. Kanno, S. Hisatake and Takeshi Yasui : THz to optical carrier conversion using electro-optic polymer modulators and pptical combs, 16th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR2024), Aug. 2024.
4.	Yudai Matsumura, Yu Tokizane, Eiji Hase, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, T. Kaji, A. Otomo, I. Morohashi, A. Kanno, S. Hisatake and Takeshi Yasui : Carrier Conversion From Terahertz Wave To Dual-Wavelength Near-Infrared Light Injection-Locked Optical Comb For Photonic Terahertz Detection In Wireless Communication, 4th URSI Atlantic Radio Science Meeting (AT-RASC 2024), May 2024.
5.	Takumi Kikuhara, Y. Makimoto, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Kenji Nishimoto, Takeo Minamikawa, Eiji Hase, Junichi Fujikata, A. Kanno, S. Hisatake, Naoya Kuse and Takeshi Yasui : Wireless Data Transmission in a 560-GHz Band Utilizing Terahertz Waves Generated through Photomixing by Injection-Locked Distributed Feedback Lasers with Kerr Micro-Resonator Soliton Comb, 4th URSI Atlantic Radio Science Meeting (AT-RASC 2024), May 2024.
6.	Yu Tokizane, Takumi Kikuhara, Y. Makimoto, Hiroki Kishikawa, Yasuhiro Okamura, Kenji Nishimoto, A. Kanno, S. Hisatake, Naoya Kuse and Takeshi Yasui : Terahertz wave generation by dual-wavelength laser lights injection-locked to a soliton microcomb in mode spacing of 560 GHz for wireless communication with advanced modulation format, Conference on Lasers and Electro-Optics (CLEO) 2024, JTu2A.65, May 2024.
7.	Shota Okada, Kenji Nishimoto, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse and Takeshi Yasui : Generation of Terahertz Wave at 560 GHz based on Photomixing of 560-GHz-spacing Soliton Microcomb with UTC-PD, 28th Microoptics Conference (MOC2023), PO-28, Miyazaki, Sep. 2023. (Link to Publication Site) ● Publication site (DOI): 10.23919/MOC58607.2023.10302868 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.23919/MOC58607.2023.10302868 (DOI: 10.23919/MOC58607.2023.10302868)
8.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : Dual-wavelength CW lasers injection-locked to optical comb modes for carrier conversion from THz wave to near-infrared light via electro-optical polymer modulator, 48th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz2023), Th-P2-63, Montreal, Sep. 2023. (Link to Publication Site) ● Publication site (DOI): 10.1109/IRMMW-THz57677.2023.10299276 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/IRMMW-THz57677.2023.10299276 (DOI: 10.1109/IRMMW-THz57677.2023.10299276)
9.	Yu Tokizane, Shota Okada, Kenji Nishimoto, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : Terahertz wave generated by photomixing of dual-wavelength laser lights injection-locked to a 560-GHz-spacing soliton microcomb for THz wireless communication, 48th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz2023), Th-AM-1-5, Montreal, Sep. 2023. (Link to Publication Site) ● Publication site (DOI): 10.1109/IRMMW-THz57677.2023.10298947 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85177635952 (DOI: 10.1109/IRMMW-THz57677.2023.10298947, Elsevier: Scopus)
10.	Takumi Kikuhara, Yoshihiro Makimoto, Yu Tokizane, Naoya Kuse, Eiji Hase, Yudai Matsumura, Hiroki Kishikawa, Atsushi Kanno, Shintaro Hisatake, Yasuhiro Okamura and Takeshi Yasui : Phase moduration in terahertz wave communication using micro-optical comb, 10th International Symposium on Terahertz-Related Devices and Technologies (TeraTech 2023), WeP-23, Sep. 2023.
11.	Yu Tokizane, Shota Okada, Kenji Nishimoto, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse, Atsushi Kanno, Shinataro Hisatake and Takeshi Yasui : Generation of terahertz wave by photo mixing of micro soliton comb modes and its application to terahertz wireless communication, The Third Philippines - Japan Terahertz Research Workshop in 2023 (PJTW 2023), Inv5, Manila, Jul. 2023.
12.	Shota Okada, Kenji Nishimoto, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse and Takeshi Yasui : Generation of terahertz wave at 560 GHz based on photomixing of 560-GHz-spacing soliton microcomb with UTC-PD, Photonics and Electromagnetics Research Symposium (PIERS2023), 1A4, Praha, Jul. 2023.
13.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : Dual-wavelength, low-phase-noise, optical carrier for terahertz-to-optical carrier conversion with electro-optic polymer modulator, Photonics and Electromagnetics Research Symposium (PIERS2023), 1P4a, Praha, Jul. 2023.
14.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : Terahertz-to-optical carrier conversion using optical-comb-injection-locked dual-wavelength laser light and electro-optic polymer modulator, Conference on Lasers and Electro-Optics (CLEO) Europe 2023, CC-P11, Munich, Jun. 2023. (Link to Publication Site) ● Publication site (DOI): 10.1109/CLEO/Europe-EQEC57999.2023.10232178 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/CLEO/Europe-EQEC57999.2023.10232178 (DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10232178)
15.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kannno, Shintaro Hisatake, Naoya Kuse and Takeshi Yasui : Carrier conversion from 100-GHz THz wave to dual-wavelength optical carrier injection-locked to optical comb modes using electro-optical polymer modulator for photonic THz detection, Conference on Lasers and Electro-Optics (CLEO) 2023, JTh2A.98, San Jose, May 2023.
16.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : Fundamental study on optical heterodyned terahertz detection using optical-comb-injection-locked dual-wavelength laser light and electro- optic polymer modulator, pLED International symposium 2023: Exploring Invisible Light Technology, P-20, Tokushima, Mar. 2023.
17.	Shota Okada, Kenji Nishimoto, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse and Takeshi Yasui : Microcomb-based 560-GHz terahertz wave generation for next-generation wireless communication, Photonics West 2023: OPTO 2023, 12420-38, San Francisco, Feb. 2023. (Link to Publication Site) ● Publication site (DOI): 10.1117/12.2651342 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85160742825 (DOI: 10.1117/12.2651342, Elsevier: Scopus)
18.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : All-photonic THz detection using CW laser injection-locked to microcomb, 13th International Conference on Organic Nonlinear Optics (ICONO13), P2-13, Nara, Nov. 2022.
19.	Shota Okada, Nishimoto KENJI, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse and Takeshi Yasui : Basic study on THz wireless communication using Kerr mcro-resonator frequency combs, 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz2022), Mo-P-18, Delft, Aug. 2022.
20.	Yu Tokizane, Yasuhiro Okamura, Hiroki Kishikawa, Naoya Kuse and Takeshi Yasui : THz-wave generation and modulation for wireless communication using mIcro soliton comb, Conference on Lasers and Electro-Optics 2022 (CLEO2022), AW5L.2, San Jose, May 2022. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85139907813 (Elsevier: Scopus)
21.	Yu Tokizane, Okada Shota, Yasuhiro Okamura, Hiroki Kishikawa, Naoya Kuse and Takeshi Yasui : Investigation of THz-wave generation using micro-resonator frequency comb with spontaneous amplified emission, The 11th Advanced Lasers and Photon Sources (ALPS2022), ALPSp-28, Yokohama, Apr. 2022.
22.	Yu Tokizane, Yasuhiro Okamura, Hiroki Kishikawa, Naoya Kuse and Takeshi Yasui : Modulation of THz-wave for THz wireless communication using micro soliton comb, International Symposium on Novel maTerials and quantum Technologies 2021 (ISNTT2021), P2-248-3, Online, Dec. 2021.
23.	Yasuhiro Okamura and Atsushi Takada : Influence of Phase Constant Difference between Dispersive Elements in Difference-Frequency Generation Based Optical-Phase-Conjugation Circuit, 24th Microoptics Conference (MOC2019), P-75, Toyama, Nov. 2019. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85081104226 (Elsevier: Scopus)
24.	Yasuhiro Okamura, Yusuke Seto, Naotaka Ishimura and Atsushi Takada : Transmission Performance of 16QAM Signal Interleaved with Amplified Reference Light, 24th Microoptics Conference (MOC2019), P-57, Toyama, Nov. 2019. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85081103903 (Elsevier: Scopus)
25.	Kazama Takushi, Umeki Takeshi, Yasuhiro Okamura, Enbutsu Koji, Tadanaga Osamu, Atsushi Takada and Kasahara Ryoichi : Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump, 24th Optoelectronics and Communications Conference (OECC 2019)/International Conference on Photonics in Switching and Computing 2019 (PSC 2019), Hakata, Jul. 2019. (Link to Publication Site) ● Publication site (DOI): 10.23919/PS.2019.8818030 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85072348547 (DOI: 10.23919/PS.2019.8818030, Elsevier: Scopus)
26.	Yasuhiro Okamura, Noami Shunsuke and Atsushi Takada : Wavelength-Conversion Free Optical Phase Conjugator Based on Difference Frequency Generation, 24th Optoelectronics and Communications Conference (OECC 2019)/International Conference on Photonics in Switching and Computing 2019 (PSC 2019), Hakata, Jul. 2019. (Link to Publication Site) ● Publication site (DOI): 10.23919/PS.2019.8818009 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85072330885 (DOI: 10.23919/PS.2019.8818009, Elsevier: Scopus)
27.	Yasuhiro Okamura, Kenta Kondou and Atsushi Takada : Optical Carrier Extraction from Wavelength-Division Multiplexed Phase-Conjugate Twin Waves for Phase-Sensitive Optical Amplifier Repeaters, 23rd Microoptics Conference, P-13, Taipei, Oct. 2018.
28.	Yasuhiro Okamura, Ikuya Nagatomi, Shinsuke Sharyo and Atsushi Takada : Novel Carrier Extraction for Pump Phase-Locking to Polarized PDM-PCTWs in Phase-Sensitive Optical Amplifier Repeaters, 2018 7th IEEE International Conference on Photonics (ICP2018), Langkawi, Apr. 2018. (Link to Publication Site) ● Publication site (DOI): 10.1109/ICP.2018.8533203 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85058494510 (DOI: 10.1109/ICP.2018.8533203, Elsevier: Scopus)
29.	Takeshi Umeki, Takushi Kazama, Takayuki Kobayashi, Shigehiro Takasaka, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Hirokazu Takenouchi, Ryuichi Sugizaki, Atsushi Takada, Ryoichi Kasahara and Yutaka Miyamoto : Polarization-diversity In-line Phase Sensitive Amplifier for Simultaneous Amplification of Fiber-transmitted WDM PDM-16QAM Signals, 2018 Optical Fiber Communication Conference (OFC), Vol.F84-OFC, No.2018, M3E.4, San Diego, Mar. 2018. (Link to Publication Site) ● Publication site (DOI): 10.1364/OFC.2018.M3E.4 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85047115220 (DOI: 10.1364/OFC.2018.M3E.4, Elsevier: Scopus)
30.	Yasuhiro Okamura, Kotaro Kondo, Takumi Okabe, Masafumi Koga and Atsushi Takada : Pump Phase-Locking to Phase-Conjugated Twin Waves with Heterodyne OPLL Assisted by Sum-Frequency and Second Harmonic Generation for ND-PSAs, The 22nd Microoptics Conference (MOC2017), P-96, Tokyo, Nov. 2017. (Link to Publication Site) ● Publication site (DOI): 10.23919/MOC.2017.8244618 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85045883791 (DOI: 10.23919/MOC.2017.8244618, Elsevier: Scopus)
31.	Yasuhiro Okamura, Hayaki Uno, Masanori Hanawa and Atsushi Takada : Quadrature Imbalance Compensation for M-ary Modulated Signals Interleaved with Reference Light, The 22nd Microoptics Conference (MOC2017), 328-329, Tokyo, Nov. 2017. (Link to Publication Site) ● Publication site (DOI): 10.23919/MOC.2017.8244619 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85045946211 (DOI: 10.23919/MOC.2017.8244619, Elsevier: Scopus)
32.	Yasuhiro Okamura, Shingo Seki and Atsushi Takada : Pump Phase-Locking Method Dependence of ND- PSA Repeaters on Multi-Span Transmission of QPSK-PCTWs in Dispersion Compensated Links, 2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC), P3-040, Singapore, Aug. 2017. (Link to Publication Site) ● Publication site (DOI): 10.1109/OECC.2017.8115034 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85048294791 (DOI: 10.1109/OECC.2017.8115034, Elsevier: Scopus)
33.	Yasuhiro Okamura, Masashi Abe, Kotaro Kondo, Yuya Ohmichi, Takushi Kazama, Takeshi Umeki, Masafumi Koga and Atsushi Takada : First Demonstration of Non-Degenerate Phase- Sensitive Amplification with Pump Light Recovered by Optical Phase-Locked Loop, The 2016 IEEE Photonics Conference (IPC 2016), 511-512, Waikoloa, Oct. 2016. (Link to Publication Site) ● Publication site (DOI): 10.1109/IPCon.2016.7831205 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85014263917 (DOI: 10.1109/IPCon.2016.7831205, Elsevier: Scopus)
34.	Yasuhiro Okamura, Kotaro Kondo, Yuya Ohmichi, Masafumi Koga and Atsushi Takada : Optical phase-locking among phase-conjugated twin waves and free-running pump by using sum-frequency and second harmonic generation assisted OPLL for ND-PSA repeaters, Conference on Lasers and Electro-Optics 2016 (CLEO 2016), SF1G.6, San Jose, Jun. 2016. (Link to Publication Site) ● Publication site (DOI): 10.1364/CLEO_SI.2016.SF1G.6 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85010695862 (DOI: 10.1364/CLEO_SI.2016.SF1G.6, Elsevier: Scopus)
35.	ALOUNSOULIYA ALY, Yasuhiro Okamura and Atsushi Takada : Noise characteristics of non-degenerate optical parametric phase-sensitive amplifier with gain saturation and distributed loss in gain medium, The 2016 IEEE 6th International Conference on Photonics (ICP2016), Sarawak, Malaysia, Mar. 2016. (Link to Publication Site) ● Publication site (DOI): 10.1109/ICP.2016.7510033 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84981716538 (DOI: 10.1109/ICP.2016.7510033, Elsevier: Scopus)
36.	Yasuhiro Okamura, Kotaro Kondo, Shingo Seki, Yuya Ohmichi, Masafumi Koga and Atsushi Takada : Frequency Nondegenerate Optical Parametric Phase-sensitive Amplifier Repeater by Using Recovered Pump Carrier Generated from Phase-conjugated Twin Waves, The Optical Fiber Communication Conference and Exhibition 2016 (OFC 2016), Th2A.7, Anaheim, Mar. 2016. (Link to Publication Site) ● Publication site (DOI): 10.1364/ofc.2016.th2a.7 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84986216972 (DOI: 10.1364/ofc.2016.th2a.7, Elsevier: Scopus)
37.	Yasuhiro Okamura, Naotaka Ishimura, Yusuke Mitsui, Masanori Hanawa and Atsushi Takada : Influence of Chromatic Dispersion on Optical Transmission of 16QAM Signals Interleaved with Reference Light, 20th Microoptics Conference (MOC 2015), H-80, Fukuoka, Oct. 2015. (Link to Publication Site) ● Publication site (DOI): 10.1109/MOC.2015.7416487 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84969543195 (DOI: 10.1109/MOC.2015.7416487, Elsevier: Scopus)
38.	Yasuhiro Okamura and Atsushi Takada : Degradation of Signal Quality Due to Pump-Phase Fluctuation on Non-Degenerated Fiber Parametric Phase-Sensitive Amplifier Repeaters, 20th Microoptics Conference (MOC 2015), H-79, Fukuoka, Oct. 2015. (Link to Publication Site) ● Publication site (DOI): 10.1109/MOC.2015.7416486 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84969506348 (DOI: 10.1109/MOC.2015.7416486, Elsevier: Scopus)
39.	Yasuhiro Okamura, Koryo Higashiyama, Masafumi Koga and Atsushi Takada : Optical phase lock loop circuit for Non-degenerate optical parametric phase sensitive amplifiers with wide signal-idler optical frequency spacing, Conference on Lasers and Electro-Optics 2015 (CLEO 2015), SM1M-2, San Jose, May 2015. (Link to Publication Site) ● Publication site (DOI): 10.1364/CLEO_SI.2015.SM1M.2 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84954072055 (DOI: 10.1364/CLEO_SI.2015.SM1M.2, Elsevier: Scopus)
40.	Yasuhiro Okamura, Atsushi Takada and Masanori Hanawa : Influence of I/Q imbalance on Multi-level modulated Signals Interleaved with Reference Light, International Conference on Optical Internet 2014 (COIN 2014), Cheju, Aug. 2014.
41.	Masanori Hanawa, Hiroshi Mizukami and Yasuhiro Okamura : 10-Gbit/s QPSK self-homodyne transmission using a quadrature-phase-modulated and polarization-multiplexed pilot carrier, OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology 2014 (OECC/ACOFT 2014), Jul. 2014.
42.	Atsushi Takada, Koryo Higashiyama, Eiji Hamada, Yasuhiro Okamura, Akira Mizutori and Masafumi Koga : Optical phase locking between pump and multiple-carrier signal lights in frequency-nondegenerate parametric phase-sensitive amplifier, OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology 2014 (OECC/ACOFT 2014), Jul. 2014.
43.	Yasuhiro Okamura and Atsushi Takada : Nonlinear Degradation in 10-Gbit/s Nyquist BPSK Signal Transmission Systems with In-Line Phase-Sensitive Amplifiers, OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology 2014 (OECC/ACOFT 2014), Jul. 2014.
44.	Yasuhiro Okamura, Osamu Iijima, Satoshi Shimizu, Naoya Wada and Masanori Hanawa : 10-Gbit/s QPSK x single-channel Fourier-encoded synchronous OCDM transmission over 50-km SMF, 18th Microoptics Conference (MOC 2013), Tokyo, Oct. 2013.
45.	Hiroshi Mizukami, Yasuhiro Okamura and Masanori Hanawa : Self-homodyne Detection of Phase Modulated Signals using Quadrature-phase-modulated and Polarization-multiplexed Pilot Carrier, 18th Opto-Electronics and Communications Conference (OECC 2013), Kyoto, Jul. 2013.
46.	Osamu Iijima, Yasuhiro Okamura and Masanori Hanawa : Digital Compensation of Phase and Wavelength Errors in FBG Encoders for FE-SOCDM system, 18th Opto-Electronics and Communications Conference (OECC 2013), Kyoto, Jul. 2013.
47.	Yasuhiro Okamura, Osamu Iijima, Satoshi Shimizu, Naoya Wada and Masanori Hanawa : Simultaneous detection of 10-Gbit/s QPSK x 4-channel FE-SOCDM signals, 18th Opto-Electronics and Communications Conference (OECC 2013), Kyoto, Jul. 2013.
48.	Yasuhiro Okamura and Masanori Hanawa : All optical interleave of multi-level modulated signal with reference light, 17th Opto-Electronics and Communications Conference (OECC 2012), Busan, Jul. 2012.
49.	Masanori Hanawa, Shohei Nozaki, Kenta Hosoya, Yasuhiro Okamura and Koji Nonaka : BER characteristics of 2ch OOK-OCDM using 16-chip concatenated Fourier code, 16th Opto-Electronics and Communications Conference (OECC 2011), Kaohsiung, Jul. 2011.
50.	Masanori Hanawa, Yasuhiro Okamura, Shohei Nozaki and Kenta Hosoya : Experimental demonstration of optical concatenated coding enabling channel grouping on OCDM networks, International Conference on Optical Internet 2010 (COIN 2010), Cheju, Jul. 2010.
51.	Masanori Hanawa, Kouichi Toda, Yasuhiro Okamura, Tomoyuki Ishikawa and Setsuya Shimegi : Implementation of compact and dense optical comb-like filter by interleaved superstructure fiber Bragg grating, 9th Optoelectronics and Communications Conference/3rd International Conference on Optical Internet (OECC/COIN 2004), Yokohama, Jul. 2004.

Proceeding of Domestic Conference:

1.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : OOK変調THz波のTHz/光キャリア変換, 電子情報通信学会ソサエティ大会 2024, C-14-05, Sep. 2024.
2.	Takumi Kikuhara, 牧本宣大, Yu Tokizane, Naoya Kuse, Yudai Matsumura, Hiroki Kishikawa, 菅野敦史, 久武信太郎, Yasuhiro Okamura and Takeshi Yasui : ヘテロダイン検波を用いた560GHz帯マイクロ光コム駆動型THz通信, 電子情報通信学会ソサエティ大会 2024, C-14-02, Sep. 2024.
3.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : 光コム注入同期CWレーザーを用いたオール光型THz検出 (3) ~変調THz信号検出に関する検討~, 第71回応用物理学会春季学術講演会, 25p-11E-4, Mar. 2024.
4.	Takumi Kikuhara, 牧本宜大, Yu Tokizane, Naoya Kuse, Yudai Matsumura, Hiroki Kishikawa, 菅野敦史, 久武信太郎, Yasuhiro Okamura and Takeshi Yasui : マイクロ光コム駆動型テラヘルツ通信における位相ノイズの評価, 電子情報通信学会総合大会2024, C-14-09, Mar. 2024.
5.	Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : 電気光学ポリマー変調器と光コムを用いたTHz/光キャリア変換, 電子情報通信学会総合大会2024, C-14-08, Mar. 2024.
6.	Takumi Kikuhara, 牧本宣大, Yu Tokizane, Naoya Kuse, Yudai Matsumura, Hiroki Kishikawa, 菅野敦史, 久武信太郎, Yasuhiro Okamura and Takeshi Yasui : マイクロ光コムを用いたテラヘルツ通信における位相変調方式の検討, 第84回応用物理学会秋季学術講演会, 20p-B203-2, Sep. 2023.
7.	, Yasuhiro Okamura, Atsushi Takada and 佐藤隆宣 : 水中移動体光無線通信のための送受信ビーム角度制御によるレーザービーム追尾技術の検討, Vol.0, No.0, 0, Sep. 2023.
8.	YUDAI Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 諸橋功, 久武信太郎 and Takeshi Yasui : マイクロ光コム注入同期 CW レーザーを用いたオール光型 THz 検出(2) ~光キャリアと変調サイドバンドのRFビート信号検出~, 第70回応用物理学会春季学術講演会, 17p-A202-4, Mar. 2023.
9.	Yu Tokizane, Shota Okada, KENJI Nishimoto, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse, 菅野敦史, 久武信太郎 and Takeshi Yasui : マイクロ光コム注入同期2モード光のフォトミキシングを用いたオール光型テラヘルツ通信, 第70回応用物理学会春季学術講演会, 17p-A202-3, Mar. 2023.
10.	Yasuhiro Okamura and Atsushi Takada : 四光波混合を用いた伝送路分布位相感応型光増幅中継技術, レーザー学会学術講演会, Vol.0, No.0, 0, Jan. 2023.
11.	Yasuhiro Okamura and Atsushi Takada : 波長帯域シフトフリー位相共役光伝送における伝送路パワープロファイルの影響, レーザー学会ン弁治大会, Vol.0, No.0, 0, Jan. 2023.
12.	YUDAI Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : マイクロ光コム注入同期レーザーを用いた電気光学ポリマー変調デバイスの評価, 第7回フォトニクスワークショップ, 1-P-17, Nov. 2022.
13.	Shota Okada, KENJI Nishimoto, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse and Takeshi Yasui : 光注入同期を用いて低ノイズ・光増強したマイクロ光コムによるテラヘルツ無線通信, 第7回フォトニクスワークショップ, 1-P-16, Nov. 2022.
14.	YUDAI Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : マイクロ光コム注入同期CWレーザーを用いたオール光型THz検出(1) ~電気光学ポリマー・デバイスを用いた変調サイドバンドの光スペクトル計測~, 第83回応用物理学会秋季学術講演会, 21p-A202-9, Sep. 2022.
15.	Hiroki Kishikawa, Yasuhiro Okamura, Yu Tokizane, Naoya Kuse, Takahiro Kaji, Atsushi Kanno, Shintaro Hisatake and Takeshi Yasui : Influence of Optical Signal-to-Noise Ratio of Comb Modes on THz Communication Signal Generation with Microresonator Soliton Comb, 2022年電子情報通信学会ソサイエティ大会, C-14-14, Sep. 2022.
16.	yuma takeda, KAZUYA Matsuda, Yasuhiro Okamura, Yu Nakadoi, Yuya Haoka and Atsushi Takada : ナロービームによる水中移動体光無線情報伝送における伝送速度の伝送距離依存性の理論検討, 2022年電子情報通信学会ソサイエティ大会, B-10-15, Sep. 2022.
17.	Shota Okada, KENJI Nishimoto, Yu Tokizane, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse and Takeshi Yasui : マイクロ光コムの光/THz変換を用いたテラヘルツ通信の品質向上についての検討~前方励起ファイバー光増幅によるASEの抑制~, 第69回応用物理学会春季学術講演会, 25p-D315-6, Mar. 2022.
18.	Yasuhiro Okamura, akira tanaka and Atsushi Takada : Optical Parametric Signal Processing for Optical Fiber Communication, IEICE Technical Report, Vol.IEICE-121, No.350, 51-55, Jan. 2022.
19.	Yu Tokizane, Yasuhiro Okamura, Hiroki Kishikawa, Naoya Kuse and Takeshi Yasui : 電気光学変調とフォトミキシングを用いたマイクロ光コムテラヘルツ波の変調, Optics & Photonics Japan 2021, 29pE10, Oct. 2021.
20.	Atsushi Ohmori, Yasuhiro Okamura and Atsushi Takada : Study on Quantization Conditions in Digitization of Optical Phase-Locked Loop Circuit for Phase-Sensitive Optical Amplification, 令和 3 年度電気・電子・情報関係学会四国支部連合大会, 12-26, Sep. 2021.
21.	takahiro kanamori, Yasuhiro Okamura, Yu Nakadoi, Yuya Haoka, Kaoru Nakayama and Atsushi Takada : A Study on center-position estimation of received beam for optical wireless communication system, 令和 3 年度電気・電子・情報関係学会四国支部連合大会, 12-25, Sep. 2021.
22.	kenta takara, Yasuhiro Okamura and Atsushi Takada : Study on quality deterioration of quadrature phase component in multi-relay transmission system using degenerate phase sensitive optical amplification repeater, 令和 3 年度電気・電子・情報関係学会四国支部連合大会, 12-22, Sep. 2021.
23.	Akira Tanaka, Yasuhiro Okamura and Atsushi Takada : Amplitude noise suppression phase-sensitive optical amplified multi-relay transmission system using optical Kerr effect, Proceedings of IEICE Society Conference, B-10-20, Sep. 2021.
24.	Yu Tokizane, Yasuhiro Okamura, Hiroki Kishikawa, Naoya Kuse and Takeshi Yasui : マイクロ光コムを用いたテラヘルツ無線通信の検討, 第82回応用物理学会秋季学術講演会予稿集, 13a-N105-11, Sep. 2021.
25.	akira tanaka, Yasuhiro Okamura and Atsushi Takada : Amplitude noise suppression by using non-degenerate phase sensitive amplification and optical Kerr effect, 電子情報通信学会総合大会, B-10-27, Mar. 2021.
26.	Yasuhiro Okamura and Atsushi Takada : Multi-span transmission of WDM signals repeated by waveband-shift free optical-phase conjugator, レーザー学会学術講演会第41回年次大会, G04-19p-VII-04, Jan. 2021.
27.	taichi kito, Yasuhiro Okamura and Atsushi Takada : Basic Study of Optical Gate Pulse Width in Demultiplexing of Optical Time Division Multiplexing Signals, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
28.	(名) ikegawa, Yasuhiro Okamura and Atsushi Takada : A Study on Suppression of Residual Amplitude Modulation Component of Optical Phase-Locked Loop Circuit for Optical Quadrature Amplitude Modulation Signal, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
29.	kenya ishikawa, Yasuhiro Okamura and Atsushi Takada : A Study on Eye Pattern and Wavelength Conversion Bandwidth of Wavelength Converter Using Cascaded Second-Order Nonlinear Effect in Periodically Polarized Lithium Niobate Waveguide, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
30.	michio yamamoto, Yasuhiro Okamura and Atsushi Takada : A study on Optical Time Division Multiplexed Transmission System Relayed by Phase-Sensitive Optical Amplifiers, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
31.	tomoya miyake, Yasuhiro Okamura and Atsushi Takada : A Study on Noise Measurement Method for Optical Phase-Locked Loop Generated Pump light for Phase-sensitive Optical Amplification, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
32.	shinnosuke araki, Yasuhiro Okamura and Atsushi Takada : Pump light quality using Optical Phase-Locked Loop in Phase Sensitive Optical Amplifier Repeaters, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
33.	風間拓志, 梅木毅伺, Yasuhiro Okamura, 圓佛晃次, 忠永修, Atsushi Takada and 笠原亮一 : 位相同期局発光源を用いた位相感応増幅器の低雑音性の実証, 電子情報通信学会総合大会講演論文集, B-10-12, Mar. 2020.
34.	Yasuhiro Okamura and Atsushi Takada : 差周波光発生を用いた波長無変換型位相共役光発生器における分散性素子間屈折率偏差の影響, 電子情報通信学会総合大会講演論文集, B-10-13, Mar. 2020.
35.	Akira Tanaka, Yasuhiro Okamura and Atsushi Takada : 位相感応型光増幅器と光カー効果を用いた振幅雑音抑圧法の検討, 電子情報通信学会総合大会講演論文集, B-10-11, Mar. 2020.
36.	Yasuhiro Okamura and Atsushi Takada : Influence of splitting ratio deviation on difference-frequency generation based optical phase conjugation circuit, レーザー学会学術講演会第40回年次大会, G01-21p-X-04, Jan. 2020.
37.	Tatsuya Nishizaki, Yasuhiro Okamura and Atsushi Takada : Polarization Independent Carrier Extraction in Pump Phase-Locked Loop for Phase-Sensitive Amplifier Repeaters Using Polarization Orthogonal Dual Pilot Tone, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2019.
38.	Atsushi Nii, Yasuhiro Okamura and Atsushi Takada : Proposal of noise characteristics evaluation index of phase sensitive optical amplifier and its dependency on a deterioration factor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2019.
39.	Hideaki Hayashi, Yasuhiro Okamura and Atsushi Takada : Study on numerical-simulation method in analysis of optical phase lock loop circuit, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2019.
40.	miyamoto ryo, Yasuhiro Okamura and Atsushi Takada : Mitigation of Multi-User Interference on Fourier-Encoded Optical Code Division Multiplexing Systems with Encoded Symbol Copy Insertion, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2019.
41.	Atsushi Nii, Yasuhiro Okamura and Atsushi Takada : Proposal of noise characteristics evaluation index of phase sensitive optical amplifier and its dependency on a deterioration factor, Proceedings of IEICE Society Conference, Sep. 2019.
42.	Yasuhiro Okamura and Atsushi Takada : Wavelength-Conversion Free Optical Phase-Conjugator with Difference-Frequency Generation, Proceedings of IEICE Society Conference, Sep. 2019.
43.	Yasuhiro Okamura and Atsushi Takada : Simultaneous Carrier Extraction from WDM-Phase-Conjugated Twin Waves on Pump Phase-Locking for Phase-Sensitive Amplifier Repeaters, レーザー学会学術講演会第39回年次大会, G113a02, Jan. 2019.
44.	Yusuke Seto, Yasuhiro Okamura and Atsushi Takada : Waveform Degradation on Demodulation of Interleaved 16QAM Signals with Amplified Reference Light with Single Photodetector, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 12-30, Sep. 2018.
45.	Takashi Hioka, Yasuhiro Okamura and Atsushi Takada : Compensation of Optical Nonlinear Degradation Using Phase Conjugated Twin Waves on Fourier-Encoded Synchronous Optical Code Division Multiplexed Systems, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 12-29, Sep. 2018.
46.	Ryo Miyamoto, Yasuhiro Okamura and Atsushi Takada : Improvement of Symbol Asynchronization Penalty in Fourier-Encoded Synchronous Optical Code Division Multiplexing Systems with Oversampling Detection, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 12-28, Sep. 2018.
47.	Wataru Nakanishi, Kouhei Aga, Ikuya Nagatomi, Tatsuya Nishizaki, Yasuhiro Okamura and Atsushi Takada : Feedback Control of Carrier Component Extraction from Polarization-Division Multiplexed Signal for Optical Phase-Locked Loop in Phase-Sensitive Amplifier Repeaters, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 12-27, Sep. 2018.
48.	Ryo Morimoto, Yasuhiro Okamura and Atsushi Takada : Study on Performance Index of Phase Sensitive Optical Parametric Amplifier for Polarization Multiplexed Signal, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 12-26, Sep. 2018.
49.	Yu Inoue, Yasuhiro Okamura and Atsushi Takada : A study on Transmission Quality of Carrier Phase Locked Wavelength Division Multiplexed Optical Fiber Transmission System with Non-Degenerate Phase-Sensitive Optical Amplification, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 12-18, Sep. 2018.
50.	Takeshi Umeki, Takushi Kazama, Takayuki Kobayashi, Shigehiro Takasaka, Yasuhiro Okamura, Koji Enbutsu, Ryuichi Sugizaki, Atsushi Takada, Ryoichi Kasahara and Yutaka Miyamoto : PDM-16QAM信号の高利得・WDM一括位相感応光中継増幅, 電子情報通信学会総合大会講演論文集, B-10-24, Mar. 2018.
51.	Ikuya Nagatomi, Kohei Aga, Takumi Okabe, Wataru Nakanishi, Yasuhiro Okamura and Atsushi Takada : Pump Phase-Locked to PDM Phase-Conjugated Twin Waves by using Phase Modulation in Optical Parametric Phase-Sensitive Amplifier Repeaters, IEICE Technical Report, Feb. 2018.
52.	Kohei Aga, Takumi Okabe, Ikuya Nagatomi, Wataru Nakanishi, Yasuhiro Okamura, Ryoichi Kasahara, Takeshi Umeki and Atsushi Takada : Optical Phase-Locked Loop in Optical Parametric Phase-Sensitive Amplifier Repeaters for Dual Polarization Phase-Conjugated Twin Waves, レーザー学会学術講演会第38回年次大会, G225pIX09, Jan. 2018.
53.	Yasuhiro Okamura and Atsushi Takada : Optical phase-locked loop with carrier extraction by using quadrature squeezing and second-harmonic generation for polarization-multiplexed M-QAM phase-conjugated twin waves, レーザー学会学術講演会第38回年次大会, G225pIX10, Jan. 2018.
54.	Satoki Nakajima, Yasuhiro Okamura and Atsushi Takada : Frequency Estimation Using Polarization Multiplexed Optical Phase Conjugate Signal on Fourier-Encoded Synchronous Optical Code Division Multiplexed Systems, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 134, Sep. 2017.
55.	Takumi Okabe, Yasuhiro Okamura and Atsushi Takada : Study on Optimum Design of Loop Filter in Pump Phase Synchronization using Optical Phase-lock Loop in Optical Parametric Phase-sensitive Amplifier, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 133, Sep. 2017.
56.	Aki Yamamoto, Yasuhiro Okamura and Atsushi Takada : Study on the Inter Symbol Interference in Optical Fiber Transmission System Employing Nondegenerate Optical Parametric Phase-Sensitive Amplifier Repeaters for Quadrature Amplitude Modulated Optical Signal, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 132, Sep. 2017.
57.	Syunsuke Noami, Yasuhiro Okamura and Atsushi Takada : Study on phase conjugate light generation circuit without wavelength conversion using difference frequency generation by second order optical nonlinear medium, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 131, Sep. 2017.
58.	Hayaki Uno, Yasuhiro Okamura and Atsushi Takada : Proposal of Signal Generation Method for Multi-level Modulated Signals Interleaved with Amplified Reference Light, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 126, Sep. 2017.
59.	Kenta Kondo, Yasuhiro Okamura and Atsushi Takada : The study of extracted carrier power on dispersion of transmission optical fiber in phase-sensitive optical amplifiers using WDM signals, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 125, Sep. 2017.
60.	Yasuhiro Okamura, Masashi Abe, Kotaro Kondo, Takumi Okabe, Takushi Kazama, Akihide Sano, Takeshi Umeki, Ryoichi Kasahara and Atsushi Takada : Parametric Amplification of 80-km transmitted QPSK Phase-Conjugated Twin Waves by Non-Degenerate Phase-Sensitive Optical Amplifier Repeater with Pump Phase Locking Circuit, 電子情報通信学会総合大会講演論文集, Mar. 2017.
61.	Yuya Omichi, Masashi Abe, Kotaro Kondo, Yasuhiro Okamura, Takushi Kazama, Takeshi Umeki, Masafumi Koga and Atsushi Takada : Amplification experiment using optical phase-lock loop with sum-frequency generation of signal and phase conjugate lights in non-degenerate optical parametric phase-sensitive amplifiers, レーザー学会学術講演会第37回年次大会, Jan. 2017.
62.	Takeshi Kimura, Yasuhiro Okamura and Atsushi Takada : A study on the acceptable phase error of phase locked pump light for nondegenerate optical parametric phase-sensitive amplifier-repeater transmission systems, レーザー学会学術講演会第37回年次大会, Jan. 2017.
63.	Reo Osada, Songyuan Dai, Yasuhiro Okamura and Masanori Hanawa : 20Gbit/s-PAM4×4OCDM experiment using low timing jitter gain-switched short optical pulse source, レーザー学会学術講演会第37回年次大会, Jan. 2017.
64.	Yuki Fujita, Kotaro Kondo, Yasuhiro Okamura and Atsushi Takada : A study on bias voltage control of a single sideband optical modulator for optical voltage-controlled oscillator, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2016.
65.	Shinsuke Sharyo, Yasuhiro Okamura and Atsushi Takada : Influence of Polarization Fluctuation in Transmission Fiber on Sum-Frequency Generation Based Carrier Extraction of Polarization Multiplexed Phase-Conjugated Twin Waves, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2016.
66.	Yuya Omichi, Kotaro Kondo, Yasuhiro Okamura, Masafumi Koga and Atsushi Takada : Pump phase synchronization experiment using optical phase-lock loop with sum-frequency generation of signal and phase conjugate lights in non-degenerate optical parametric phase-sensitive amplifiers, Proceedings of the Society Conference of IEICE, Sep. 2016.
67.	Kotaro Kondo, Yuya Omichi, Yasuhiro Okamura and Atsushi Takada : Pump phase synchronization experiment using optical phase-lock loop with sum-frequency generation of signal and phase conjugate lights in non-degenerate optical parametric phase-sensitive amplifiers, 電子情報通信学会総合大会講演論文集, Mar. 2016.
68.	Shingo Seki, Yasuhiro Okamura and Atsushi Takada : Phase-Conjugated Twin Waves Transmission on Multi-Span Systems using Nondegenerate Optical Parametric Phase-Sensitive Amplifier Repeaters with Optical Phase-Locked Loop, 電子情報通信学会総合大会講演論文集, Mar. 2016.
69.	Yasuhiro Okamura, Naotaka Ishimura, Masanori Hanawa and Atsushi Takada : Nonlinear Crosstalk Degradation on Symbol-Synchronous WDM Transmission of M-ary Modulated Signals Interleaved with Reference Light, 電子情報通信学会総合大会講演論文集, Mar. 2016.
70.	Naotaka Ishimura, Yasuhiro Okamura, Masanori Hanawa and Atsushi Takada : Dispersion Tolerance Improvement on Transmission of 16-QAM signals Interleaved with Reference Light by Adjustment of Electric Field Amplitude, IEICE Technical Report, Vol.OCS2015-97, 51-56, Jan. 2016.
71.	Yasuhiro Okamura, Naotaka Ishimura, Masanori Hanawa and Atsushi Takada : WDM-PON based on multi-level modulated signals interleaved with reference light, レーザー学会学術講演会第36回年次大会, Jan. 2016.
72.	Fuminori Kiryu, Yasuhiro Okamura and Atsushi Takada : 非縮退パラメトリック位相感応型光増幅のための Decision-Driven 励起光位相同期ループ回路における信号光・アイドラ光差周波抽出回路の検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2015.
73.	Shinji Shimokawa, Atsushi Takada and Yasuhiro Okamura : 信号光と光位相共役光の共伝送信号位相感応型光増幅中継伝送系における信号品質劣化に関する研究, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2015.
74.	Takaaki Miyake, Atsushi Takada and Yasuhiro Okamura : 光周波数シフタを用いたループ型短光パルス発生系におけるパルス幅/スペクトルフラットネスの光源線幅依存性に関する研究, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2015.
75.	Takaaki Nishioka, Yasuhiro Okamura and Atsushi Takada : 光パラメトリック位相感応型増幅における出力信号光品質の励起光雑音依存性に関する検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2015.
76.	Haruka Funahashi, Eiji Hamada, Takaaki Nishioka, Yasuhiro Okamura and Atsushi Takada : 高非線形光ファイバを用いた光パラメトリック増幅器における誘導ブリルアン散乱による利得抑圧に関する検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2015.
77.	Naotaka Ishimura, Yasuhiro Okamura, Masanori Hanawa and Atsushi Takada : インターリーブ伝送における参照光振幅拡大による分散劣化の低減, Proceedings of IEICE Society Conference, Sep. 2015.
78.	Yasuhiro Okamura, Masafumi Koga and Atsushi Takada : 励起光位相同期回路を用いた光ファイバパラメトリック位相感応利得の安定化実験, Proceedings of IEICE Society Conference, Sep. 2015.
79.	Masanori Hanawa, Yamato Iwama and Yasuhiro Okamura : 偏光多重光セルフホモダイン方式における交番直交位相変調パイロットキャリアの帯域制限による分散耐性向上, Proceedings of IEICE Society Conference, Sep. 2015.
80.	Masanori Hanawa and Yasuhiro Okamura : Improvement in IQ-imbalance by Chromatic Dispersion in Optical Pol-Mux Self-Homodyne Scheme Using Circular-Quadrature-Phase-Modulated (CQPM) Pilot Carrier, 電子情報通信学会総合大会講演論文集, 405, Mar. 2015.
81.	Hamada Eiji, Yasuhiro Okamura and Atsushi Takada : Characteristics of simultaneous amplification in a non-degenerate optical parametric phase-sensitive amplifier, 電子情報通信学会総合大会講演論文集, 399, Mar. 2015.
82.	Ozaki Shouta, Yasuhiro Okamura, Masanori Hanawa and Atsushi Takada : PAPR Characteristics of Fourier Encoded Synchronous Optical Code Division Multiplexed Signals, 電子情報通信学会総合大会講演論文集, 368, Mar. 2015.
83.	Yasuhiro Okamura, Masanori Hanawa and Atsushi Takada : Influence of Laser Linewidth on Multi-level Modulated Signals Interleaved with Reference Light, 電子情報通信学会総合大会講演論文集, 376, Mar. 2015.
84.	Yasuhiro Okamura, Masanori Hanawa and Atsushi Takada : Influence of chromatic dispersion on optical fiber transmission of QPSK signals interleaved with reference light, レーザー学会学術講演会年次大会, Jan. 2015.
85.	Atsushi Takada, Yasuhiro Okamura and Masafumi Koga : コヒーレント信号の位相感応型光パラメトリック増幅, 東北大学電気通信研究所共同プロジェクト研究会「マルチキャリア光波による先進通信・計測システムに関する研究」, Dec. 2014.
86.	KORYO HIGASHIYAMA, Yasuhiro Okamura, MASAFUMI KOGA and Atsushi Takada : Detection of control signal of pump light for frequency-nondegenerate optical phase sensitive amplifiers, Proceedings of IEICE Society Conference, Sep. 2014.
87.	EIJI HAMADA, Yasuhiro Okamura and Atsushi Takada : Gain bandwidth in a non-degenerate optical parametric phase-sensitive amplifier, Proceedings of IEICE Society Conference, Sep. 2014.
88.	YUSUKE MITSUI, Yasuhiro Okamura, Atsushi Takada and MASANORI HANAWA : Blind Compensation of IQ Imbalance with Iterative CMA on M-PSK Signals Interleaved with Reference Light, Proceedings of IEICE Society Conference, Sep. 2014.
89.	SHOTA OZAKI, Yasuhiro Okamura, MASANORI HANAWA and Atsushi Takada : Influence of the Error Threshold on Iterative-Modified Constant Modulus Algorithm, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2014.
90.	YUSUKE MITSUI, NAOTAKA ISHIMURA, Yasuhiro Okamura and Atsushi Takada : Signal-Quality Monitor Creation for Multi-level Modulated Signals Interleaved with Reference Light, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2014.
91.	NAOTAKA ISHIMURA, YUSUKE MITSUI, Yasuhiro Okamura and Atsushi Takada : 24.7-km Optical-Fiber Transmission of 5-Gbaud BPSK/QPSK Signals Interleaved with Reference Light, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2014.
92.	Yasuhiro Okamura and Masanori Hanawa : Blind Dispersion Equalization on Fourier-encoded Synchronous OCDM Signals by Iteration of Modified CMA Scheme, 電子情報通信学会技術報告光通信システム, Jul. 2014.
93.	Atsushi Takada, Yasuhiro Okamura and 古賀正文 : 位相感応型光増幅中継技術, 電子情報通信学会マイクロ波フォトニクス研究会技術報告, Vol.114, No.14, 33-38, Apr. 2014.
94.	Yasuhiro Okamura, Atsushi Takada and Masanori Hanawa : 参照光時間インターリーブ多値光変調方式におけるI/Qインバランスのディジタル補償, 電子情報通信学会総合大会講演論文集, Mar. 2014.
95.	Masanori Hanawa, Hiroshi Mizukami and Yasuhiro Okamura : 交番直交位相変調された偏光多重パイロットキャリアを用いる20Gbit/s-QPSK信号のセルフホモダイン検出における波長分散の影響, 電子情報通信学会総合大会講演論文集, Mar. 2014.
96.	Yasuhiro Okamura, Atsushi Takada and Masanori Hanawa : 参照光時間インターリーブ方式における光遅延干渉計位相誤差の影響, レーザー学会学術講演会年次大会, Jan. 2014.
97.	Hiroyuki Matsuda, Masahiro Kasuga, Yasuhiro Okamura and Atsushi Takada : 光位相変調と自己位相変調による広帯域マルチキャリア光発生回路の検討, レーサー学会学術講演会年次大会, Jan. 2014.
98.	Yuya Sakai, Yasuhiro Okamura, Masafumi Koga and Atsushi Takada : 搬送波位相同期 WDM 伝送系における位相感応増幅中継による波長チャネル間クロストーク抑圧法の検討, Proceedings of the Society Conference of IEICE, Vol.B, No.10, 51, Sep. 2013.
99.	Sakai Yuya, Yasuhiro Okamura, Masafumi Koga and Atsushi Takada : 搬送波位相同期波長分割多重伝送系における位相感応増幅中継による波長チャネル間クロストーク抑圧法の検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.2013, Sep. 2013.
100.	Hiroshi Mizukami, Yasuhiro Okamura and Masanori Hanawa : Self-homodyne Detection of Phase Modulated Signals using Quadrature-phase-modulated and Polarization-multiplexed Pilot Carrier, IEICE Technical Report, Vol.113, No.156, 7-11, Jul. 2013. (Summary) A simple self-homodyne detection for optical phase modulated signal using a quadrature-phase-modulated and polarization-multiplexed pilot carrier is proposed and experimentally demonstrated. A receiver for the proposed scheme is simple enough just including a polarization controller, a polarization beam splitter and a photo detector. Experimentally obtained eye-diagrams and constellation maps shows that in-phase and quadrature phase components can be detected with the simple receiver configuration. (Keyword) セルフホモダイン / 直交位相変調 / 偏光多重パイロットキャリア / Self-homodyne / Quadrature-phase-modulation / Polarization-multiplexing pilot carrier (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520290884039666176 (CiNii: 1520290884039666176)
101.	飯島理, Yasuhiro Okamura and 塙雅典 : フーリエ符号化同期光符号分割多重信号のディジタル一括復号における光符号器の波長ずれ補償, 電子情報通信学会総合大会, Mar. 2013.
102.	Yasuhiro Okamura, 飯島理, 清水智, 和田尚也 and 塙雅典 : 10 Gbit/s QPSK x 2/4 チャネルフーリエ符号化同期OCDM信号のディジタル一括検出実験, 電子情報通信学会総合大会, Mar. 2013.
103.	Yasuhiro Okamura, Osamu Iijima, Satoshi Shimizu, Naoya Wada and Masanori Hanawa : Experimental Demonstration on Digital Decoding of 10Gbit/s Fourier-Encoded QPSK Signals and a study of Compensation Method for Improvement of Received Signal Quality, 電子情報通信学会技術報告フォトニックネットワーク, Oct. 2012.
104.	Yasuhiro Okamura, Osamu Iijima, Satoshi Shimizu, Naoya Wada and Masanori Hanawa : 10Gbit/sフーリエ符号化QPSK信号のディジタル復号実験, Proceedings of IEICE Society Conference, Sep. 2012.
105.	Yasuhiro Okamura and Masanori Hanawa : 参照光が光学的に時間インターリーブされた多値光変調信号における偏光変動の影響, IEICE Technical Report, Jul. 2012.
106.	Yasuhiro Okamura and Masanori Hanawa : 参照光が時間インターリーブされたBPSK 信号の実時間I/Q 分離, 電子情報通信学会総合大会, Mar. 2012.
107.	Yasuhiro Okamura and Masanori Hanawa : 多値変調信号を適用した時間拡散位相符号化OCDMシステムにおける相関器位相誤差の影響, レーザー学会学術講演会年次大会, Jan. 2012.
108.	Yasuhiro Okamura and Masanori Hanawa : ディジタル信号処理によるフーリエ符号化同期光符号分割多重信号の一括検出, IEICE Technical Report, Oct. 2011.
109.	Yasuhiro Okamura and Masanori Hanawa : 時間領域位相符号化OCDM信号における光相関器位相誤差の影響, Proceedings of IEICE Society Conference, Sep. 2011.
110.	Nozaki Shohei, Yasuhiro Okamura, Masanori Hanawa and Koji Nonaka : 光符号分割多重のための連接直交符号, IEICE Technical Report, Jul. 2011.
111.	Masanori Hanawa and Yasuhiro Okamura : 直交位相変調した参照光がインターリーブされた多値光変調信号のハーフシンボル光遅延干渉計による自己ホモダイン検出, 電子情報通信学会総合大会, Mar. 2011.
112.	Shohei Nozaki, Kenta Hosoya, Yasuhiro Okamura, Masanori Hanawa and Koji Nonaka : 連接符号を用いた2OCDM信号の誤り率特性, 電子情報通信学会総合大会, Mar. 2011.
113.	Yasuhiro Okamura and Masanori Hanawa : イントラダイン受信とディジタル信号処理による光QPSK信号のIQ分離, レーザー学会学術講演会年次大会, Jan. 2011.
114.	Masanori Hanawa, Yasuhiro Okamura, Shohei Nozaki and Kenta Hosoya : 4チップフーリエ符号の連接による16チップOCDM符号, Proceedings of IEICE Society Conference, Sep. 2010.
115.	Kenta Hosoya, Masanori Hanawa, Shohei Nozaki and Yasuhiro Okamura : 連接符号用FBG型可変光相関器の符号語切り替え, Proceedings of IEICE Society Conference, Sep. 2010.
116.	Yasuhiro Okamura, Masanori Hanawa and Kazuhiko Nakamura : FBG型符号可変光相関器を用いたWDM/OCDMハイブリッドループバック光アクセス方式, 電子情報通信学会総合大会講演論文集, Mar. 2005.
117.	Yasuhiro Okamura and Masanori Hanawa : 符号可変復号器によるOCDM信号の符号選択実験, Proceedings of IEICE Society Conference, Sep. 2004.
118.	Yasuhiro Okamura, Masanori Hanawa and Takafumi Ogai : FBG型符号可変符号器・復号器を用いた光符号分割多重の一検討, 電子情報通信学会技術研究報告(光通信システム), Jun. 2004.
119.	Masanori Hanawa, Koichi Toda, Yasuhiro Okamura, Tomoyuki Ishikawa and Setsuya Shimegi : 波長インターリーブした超格子構造ファイバグレーティングによる小型高密度光コムフィルタの実装, 電子情報通信学会総合大会講演論文集, Mar. 2004.
120.	Yasuhiro Okamura, Masanori Hanawa and Tomoyuki Ishikawa : 加温による超格子構造ファイバグレーティングの位相制御, 電子情報通信学会総合大会講演論文集, Mar. 2004.
121.	Masanori Hanawa, Yasuhiro Okamura, Setsuya Shimegi, Naoto Yoshitomi and Koichi Toda : WDM信号の一括3R再生中継のための遅延等化器, 電子情報通信学会技術研究報告(光通信システム), Oct. 2003.
122.	Yasuhiro Okamura, Masanori Hanawa and Setsuya Shimegi : ホモジナイザにより均一化したエキシマレーザビームによるユニフォームファイバグレーティングの製造, Proceedings of IEICE Society Conference, Sep. 2003.

Et cetera, Workshop:

1.	KIKUHARA Takumi, 牧本宣広, Yu Tokizane, Naoya Kuse, MATSUMURA Yudai, Hiroki Kishikawa, 菅野敦史, 久武信太郎, Yasuhiro Okamura and Takeshi Yasui : マイクロ光コム駆動型テラヘルツ通信における多値変調方式の評価, 次世代光フォーラム2024 in 徳島, P-12, Jan. 2024.
2.	MATSUMURA Yudai, Eiji Hase, Yu Tokizane, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : 次世代移動通信に向けたOOK信号伝送によるアイパターンの評価, 次世代光フォーラム2024 in 徳島, P-14, Jan. 2024.
3.	YUDAI Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : 電気光学ポリマー変調器と光コムモードに注入同期された 2波長CWレーザーを用いたTHz波から近赤外光へのキャリア変換, 第7回超高速光エレクトロニクス研究会 "超高速ダイナミクスを探る先端光源と計測技術", Apr. 2023.
4.	YUDAI Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Junichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, 梶貴博, 大友明, 菅野敦史, 久武信太郎 and Takeshi Yasui : 光コム注入同期2波長レーザー光と電気光学ポリマー変調器を用いた光ヘテロダイン式テラヘルツ検出に関する基礎検討, 次世代光フォーラム2023 in 徳島, P-15, Feb. 2023.
5.	Yasuhiro Okamura and Atsushi Takada : Waveband-shift free optical phase-conjugation with difference frequency generation, 1 st AiPT International All-Optical Signal Processing Workshop, Apr. 2022.
6.	Atsushi Takada and Yasuhiro Okamura : 光パラメトリック技術と光ファイバ通信への応用, 第一回電子情報通信学会支部CoEシンポジウム光をコアとするセンターオブエクセレンス(CoE)を目指してー四国から世界へー, Jan. 2021.
7.	Yasuhiro Okamura and Atsushi Takada : Pump Phase-Locking Techniques for Frequency Non-Degenerate Optical Parametric Phase-Sensitive Amplifier Repeaters, 11th International Workshop on Optical signal processing and Optical switching (IWOO 2016), Nov. 2016.
8.	Yasuhiro Okamura : 光アクセスネットワークの低消費電力・低遅延化に応える高速多値光ファイバ伝送方式, 第16回徳島大学エンジニアリングフェスティバル 2016, 9, Sep. 2016.
9.	Takeshi Umeki, Shigehiro Takasaka, Yasuhiro Okamura, Hirokazu Takenouchi, Ryuichi Sugizaki, Atsushi Takada and Yutaka Miyamoto : R&D on Optical Parametric Amplifiers in Coherent lambda Project, 21st Optoelectronics and Communications Conference / International Conference on Photonics in Switching 2016 (OECC/PS 2016), Jul. 2016.
10.	Masanori Hanawa, Yamato Iwama and Yasuhiro Okamura : IQ Imbalance Improvement in Optical Pol-Mux Self-Homodyne Scheme by Band Limited Alternately-Quadrature-Phase-Modulated Pilot Carrier, 第29回OCSシンポジウムポスター発表, P9, Dec. 2015.
11.	Yasuhiro Okamura and Atsushi Takada : Frequency Nondegenerate Optical Parametric Phase-Sensitive Amplifiers with Optical Phase-Locked Loop Circuit for Multi-Span Transmission Systems, 10th International Workshop on Optical signal processing and Optical switching (IWOO 2015), Nov. 2015.
12.	Yasuhiro Okamura : 参照光時間インターリーブ多値光変調方式を用いた次世代光ネットワーク, 第15回徳島大学エンジニアリングフェスティバル 2015, 13, Sep. 2015.
13.	Yasuhiro Okamura : 超高速参照光時間インターリーブ信号の光ファイバ伝送, 第14回徳島大学エンジニアリングフェスティバル 2014, 13, Sep. 2014.
14.	Hiroshi Mizukami, Yasuhiro Okamura and Masanori Hanawa : 直交位相変調を行った偏光多重パイロットキャリアを用いた10 Gbit/s QPSK 信号のセルフホモダイン検出, 第27回光通信システムシンポジウムポスター発表, Dec. 2013.
15.	Osamu Iijima, Yasuhiro Okamura and Masanori Hanawa : 4チャネルフーリエ符号化同期OCDM信号に対するModified CMA適用によるチャネル間干渉等化, 第27回光通信システムシンポジウムポスター発表, Dec. 2013.
16.	Yasuhiro Okamura : 参照光を時間インターリーブした多値光変調信号の光学的生成, 第13回徳島大学エンジニアリングフェスティバル 2013, 17, Sep. 2013.
17.	Masanori Hanawa, Yasuhiro Okamura and Osamu Iijima : DSP-based multi-channel simultaneous detection of 10-Gbit/s Fourier encoded-synchronous optical code division multiplexing signals, 8th International Workshop on Optical Signal Processing and Optical Switching (IWOO2013), Sep. 2013.
18.	Osamu Iijima, Yasuhiro Okamura and Masanori Hanawa : Digital Compensation of Phase Errors in FBG-based Optical Correlators in Simultaneous Digital Detection of 10Gbit/s Fourier-Encoded QPSK Signals, 7th International Workshop on OPS and OCDMA (IWOO2012), Nov. 2012.
19.	Masanori Hanawa and Yasuhiro Okamura : Simultaneous digital detection of Fourier-encoded OCDM signals, 7th International Workshop on OPS and OCDMA (IWOO2012), Nov. 2012.
20.	Yasuhiro Okamura and Masanori Hanawa : Influence of phase errors in optical correlators on 4ch Fourier encoded OCDM systems, 6th International Workshop on OPS & OCDMA (IWOO2011), Dec. 2011.

Patent:

1.	塙雅典 and Yasuhiro Okamura : コヒーレント光通信受信方式を用いた受信方法および装置, 2012-147101 (Aug. 2012), .
2.	Yasuhiro Okamura : 波長可変光フィルタ, 2008-134448 (Jun. 2008), .
3.	Takeshi Yasui, Naoya Kuse, Yu Tokizane, Eiji Hase, Hiroki Kishikawa, Yasuhiro Okamura and Junichi Fujikata : コヒーレント合成光電気変換装置, PCT/JP2023/ 26378 (Jul. 2023), .
4.	Takeshi Yasui, Naoya Kuse, Yu Tokizane, Eiji Hase, Hiroki Kishikawa, Yasuhiro Okamura, 梶貴博, 鎌田隼, 諸橋功 and 久武信太郎 : 無線受信装置, 2022-134397 (Aug. 2022), 2024-031081 (Mar. 2024), .
5.	Takeshi Yasui, Naoya Kuse, Yu Tokizane, Eiji Hase, Hiroki Kishikawa, Yasuhiro Okamura, 梶貴博, 鎌田隼, 諸橋功 and 久武信太郎 : 無線受信装置, 2022-134378 (Aug. 2022), 2024-031069 (Mar. 2024), .
6.	Takeshi Yasui, Naoya Kuse, Yu Tokizane, Eiji Hase, Hiroki Kishikawa, Yasuhiro Okamura and Junichi Fujikata : コヒーレント合成光電気変換装置, 2022-115259 (Jul. 2022), 2024-013294 (Feb. 2024), .
7.	Takeshi Yasui, Naoya Kuse, Yu Tokizane, Eiji Hase, Hiroki Kishikawa, Yasuhiro Okamura and Junichi Fujikata : 周波数多重無線伝送装置, 2022-82057 (May 2022), 2023-170363 (Dec. 2023), .
8.	Takeshi Yasui, Naoya Kuse, Yu Tokizane, Eiji Hase, Hiroki Kishikawa, Yasuhiro Okamura and Junichi Fujikata : 光電気変換装置, 2022-82054 (May 2022), 2023-170362 (Dec. 2023), .
9.	中山薫, 中土井祐, 羽岡侑哉, Atsushi Takada and Yasuhiro Okamura : 水中通信システムおよび水中通信方法, 2021-035621 (2021), .
10.	梅木毅伺, 風間拓志, 小林孝行, 笠原亮一, 宮本裕, Atsushi Takada and Yasuhiro Okamura : 光増幅器性能評価方法および評価回路, 2018-060629 (Mar. 2018), 2019-174550 (2019), .
11.	梅木毅伺, 風間拓志, 小林孝行, 笠原亮一, 宮本裕, Yasuhiro Okamura and Atsushi Takada : 励起光位相同期ループ回路および励起光位相同期方法, 2018-060743 (Mar. 2018), 2019-174558 (2019), .
12.	Atsushi Takada, Yasuhiro Okamura and Masafumi Koga : 位相感応型光増幅器及び励起光位相同期回路, (Feb. 2014), P11134 (Feb. 2014).
13.	Atsushi Takada, Yasuhiro Okamura and Masafumi Koga : 増幅中継光ファイバ伝送システム及び光ファイバ伝送システム用増幅中継器, (Aug. 2013), 2015-050670 (2015), .

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Ultra-low latency optical communication systems based on combination of time-reversed optical signal transmission and machine learning technique (Project/Area Number: 21K04063 )
Phase sensitive amplified repeated optical fiber transmission system using carrier phase locked optical time domain multiplexed signal ligtht (Project/Area Number: 20H02153 )
Study on over 1-Tbit/s ultra high-speed optical access networks (Project/Area Number: 26820146 )
Simultaneous decoding/demultiplexing of optically Fourier-encoded optical code division multiplexing signals (Project/Area Number: 25630160 )
Search by Researcher Number (90706996)