School personnel information




Ultra-high-capacity optical fiber transmission, ultra-dense wavelength-division-multiplexed techniques, mode-multiplexed techniques


Organization 【 display / non-display

  • 2013.10.01 - , Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Associate Professor

Research topics 【 display / non-display

  • The introduction of the coherent reception technique with adaptive equalization and forward error correction (FEC) makes the transmission capacity in optical fiber transmission increased so far by around 50 times in the last ten years. Nevertheless, there has been effective solution to suppress signal distortion due to phase noise accompanied with coherent detection and nonlinear effect with fiber transmission. The phase noise restricts to use higher-order quadrature-amplitude modulation signals, and fiber nonlinearity makes the launched power into a fiber, resulting in limitation of the transmission capacity and distance.
    In order to suppress the intrinsic nonlinear distortion specified in optical fiber transmission, we have proposed iterative decoding between a decoder for compensating for the nonlinear distortion and a decoder for outer FEC. We numerically and experimentally evaluate the performance of our proposed scheme for polarization-multiplexed optical coherent systems.
    Communication and network engineering-related, Electron device and electronic equipment-related


Academic Papers 【 display / non-display

  • Channel Compensation and CPR for PDM System Based on Channel Hardening Effect, S. Tanaka, T. Takahashi, S. Ibi, K. Igarashi, S. Sampei, 2019 Asia Communications and Photonics Conference (ACP), 2019.11, International Conference(Proceedings)

  • Reduction of crosstalk influence in a 7-core multicore fiber by frequency interleave, Shun Orii, Kyo Inoue and Koji Igarashi, IEICE TRANSACTIONS on Communications,vol.E102-B, No.8, 1590-1594, 2019.08, Papers

  • Bit-error-rate degradation due to inter-channel crosstalk of different signal format, Naruki Shinohara, Koji Igarashi, Kyo Inoue, IEICE Transaction on Communication,vol. E102-B, no. 5, pp. 1000-1004, 2019.05, Papers

  • Generation efficiency of four-wave mixing for phase-shift keying signal light, Kyo Inoue, Koji Igarashi, IEICE Transaction on Communication,vol. E102-B, no. 5, pp. 1005-1010, 2019.05, Papers

  • Data-Associated Channel Compensation and Carrier Phase Recovery Based on Large-System Limit for PDM System, Seiji Tanaka, Noboru Osawa, Shinsuke Ibi, Koji Igarashi, Seiichi Sampei, IEICE Tech. Rep,vol. 118, no. 288, OCS2018-57, pp. 69-74, 2018.11, Conference Report / Oral Presentation (In Japanese)

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