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Tokushima University > Research Clusters > Research Clusters (Registered) > 1704053 光パラメトリック中継技術を用いた超大容量光ファイバ伝送システムの研究 >
Tokushima University > Research Clusters > Research Clusters (Registered) > 1804009 人工知能を用いた海水養殖支援システムの開発 >
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Research Activity

Field of Study

Communication Engineering

Subject of Study

Coherent optical communication technologies (Multi-level modulated optical signals, Optical signal processing, Optical Code Division Multiplexing, Phase-sensitive optical amplification, digital signal processing, Coherent Detection, Green Optical Communications)

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. 2018.
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. 2017.

Academic Paper (Judged Full Paper):

1.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.
(DOI: 10.7567/1347-4065/ab27b4)
2.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: 113285,   DOI: 10.1587/transcom.2018EBP3085,   Elsevier: Scopus)
3.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: 113286)
4.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.
(DOI: 10.1364/OE.24.026300,   PubMed: 27857365,   Elsevier: Scopus)
5.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.
(DOI: 10.1364/OE.21.003298,   PubMed: 23481789)
6.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.
(CiNii: 10029621976)

Academic Letter:

1.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.
(DOI: 10.1587/comex.2017XBL0098)
2.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.
(DOI: 10.1587/comex.2016XBL0034)
3.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.
(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.

Proceeding of International Conference:

1.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.
2.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.
3.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.
4.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.
5.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.
6.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.
(DOI: 10.1109/ICP.2018.8533203,   Elsevier: Scopus)
7.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.
(DOI: 10.1364/OFC.2018.M3E.4,   Elsevier: Scopus)
8.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.
(DOI: 10.23919/MOC.2017.8244618,   Elsevier: Scopus)
9.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.
(DOI: 10.23919/MOC.2017.8244619,   Elsevier: Scopus)
10.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.
(DOI: 10.1109/OECC.2017.8115034,   Elsevier: Scopus)
11.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), Sapporo, Nov. 2016.
12.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.
(DOI: 10.1109/IPCon.2016.7831205,   Elsevier: Scopus)
13.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), Niigata, Jul. 2016.
14.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.
15.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.
(DOI: 10.1109/ICP.2016.7510033,   Elsevier: Scopus)
16.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.
17.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), Beijing, Nov. 2015.
18.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.
(DOI: 10.1109/MOC.2015.7416487,   Elsevier: Scopus)
19.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.
(DOI: 10.1109/MOC.2015.7416486,   Elsevier: Scopus)
20.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.
21.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.
22.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.
23.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.
24.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.
25.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.
26.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), Edinburgh, Sep. 2013.
27.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.
28.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.
29.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.
30.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), Hong Kong, Nov. 2012.
31.Masanori Hanawa and Yasuhiro Okamura :
Simultaneous digital detection of Fourier-encoded OCDM signals,
7th International Workshop on OPS and OCDMA (IWOO2012), Hong Kong, Nov. 2012.
32.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.
33.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), Okinawa, Dec. 2011.
34.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.
35.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.
36.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.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.
2.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.
3.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.
4.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.
5.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.
6.Yasuhiro Okamura and Atsushi Takada :
Wavelength-Conversion Free Optical Phase-Conjugator with Difference-Frequency Generation,
Proceedings of IEICE Society Conference, Sep. 2019.
7.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.
8.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.
9.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.
10.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.
11.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.
12.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.
13.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.
14.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.
15.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.
16.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.
17.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.
18.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.
19.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.
20.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.
21.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.
22.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.
23.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.
24.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.
25.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.
26.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.
27.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.
28.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.
29.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.
30.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.
31.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.
32.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.
33.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.
34.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.
35.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.
36.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.
37.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.
38.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.
39.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.
40.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.
41.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.
42.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.
43.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.
44.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.
45.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.
46.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.
47.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.
48.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.
49.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.
50.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.
51.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.
52.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.
53.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.
54.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.
55.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.
56.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.
57.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.
58.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.
59.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.
60.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.
61.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.
62.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.
63.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.
64.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.
(CiNii: 40019733740)
65.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.
66.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.
67.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.
68.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.
69.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.
70.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.
71.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.
72.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.
73.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.
74.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.
75.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.
76.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.
77.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.
78.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.
79.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.
80.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.
81.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.
82.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.
83.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.
84.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.
85.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.
86.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.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.
2.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.
3.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.
4.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.
5.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.
6.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.
7.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.

Patent:

1.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).
2.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), .

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

  • 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)