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2020 – today
- 2023
[j8]Hiroki Kawahara, Koji Igarashi, Kyo Inoue:
Level Allocation of Four-Level Pulse-Amplitude Modulation Signal in Optically Pre-Amplified Receiver Systems. IEICE Trans. Commun. 106(8): 652-659 (2023)- [c43]Kenta Ito, Takumi Takahashi, Koji Igarashi, Shinsuke Ibi, Seiichi Sampei:
AoA Estimation-Aided Bayesian Receiver Design via Bilinear Inference for mmWave Massive MIMO. ICC 2023: 6474-6479 - [c42]Shohei Beppu, Masahiro Kikuta, Daiki Soma, Yoichi Yaegashi, Koji Igarashi, Masahiro Shigihara, Kazuhiko Aizawa, Noboru Yoshikane, Takehiro Tsuritani:
Real-time 6-Mode 19-Core Fiber Transmission. OFC 2023: 1-3 - [c41]Koji Igarashi:
Real-time MIMO Adaptive Equalization with Carrier-phase Recovery for Mode-division Multiplexed Optical Coherent System. OFC 2023: 1-3 - 2022
- [j7]Pierre Sillard
, Kaoutar Benyahya, Daiki Soma, Guillaume Labroille, Pu Jian, Koji Igarashi, Roland Ryf, Nicolas K. Fontaine, Georg Rademacher, Kohki Shibahara:
Few-Mode Fiber Technology, Deployments, and Systems. Proc. IEEE 110(11): 1804-1820 (2022) - [c40]Koji Igarashi, Takumi Takahashi, Seiichi Sampei, Kyo Inoue:
Soft-decision FEc Designed for Optically Preamplified PAM4 Direct Detection. OECC/PSC 2022: 1-4 - [c39]Yusuke Shimizu, Koji Igarashi:
Complex Field Measurement of Optical Frequency Combs over 100-GHz Bandwidth Using a Spectrally-Slicing-and-Synthesizing Method. OECC/PSC 2022: 1-4 - 2021
- [j6]Hiroki Kawahara, Kyo Inoue, Koji Igarashi:
Analysis of Signal Distribution in ASE-Limited Optical On-Off Keying Direct-Detection Systems. IEICE Trans. Commun. 104-B(11): 1386-1394 (2021) - [c38]Shohei Beppu, Masahiro Kikuta, Koji Igarashi, Hiroshi Mukai, Masahiro Shigihara, Yasuo Saito, Daiki Soma, Hidenori Takahashi, Noboru Yoshikane, Takehiro Tsuritani:
Mode-multiplexed 16QAM transmission over 60-km coupled four-core fibres using real-time MIMO-DSP with high-accuracy frequency offset estimation. ECOC 2021: 1-4 - [c37]Shohei Beppu, Koji Igarashi, Masahiro Kikuta, Hiroshi Mukai, Masahiro Shigihara, Yasuo Saito, Daiki Soma, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani:
Real-time MIMO-DSP Technologies for SDM Systems. OFC 2021: 1-3 - [c36]Shohei Beppu, Masahiro Kikuta, Koji Igarashi, Hiroshi Mukai, Masahiro Shigihara, Yasuo Saito, Daiki Soma, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Masatoshi Suzuki, Takehiro Tsuritani:
Real-time Transoceanic Coupled 4-core Fiber Transmission. OFC 2021: 1-3 - [c35]Tsuyoshi Yoshida, Koji Igarashi, Yoshiaki Konishi, Magnus Karlsson, Erik Agrell:
FPGA Implementation of Hierarchical Subcarrier Rate and Distribution Matching for up to 1.032 Tb/s or 262144-QAM. OFC 2021: 1-3 - [i1]Tsuyoshi Yoshida, Koji Igarashi, Magnus Karlsson, Erik Agrell:
Compressed Shaping: Concept and FPGA Demonstration. CoRR abs/2102.03958 (2021) - 2020
- [c34]Hayato Kiwata, Masahiro Kikuta, Masahiro Shigihara, Koji Igarashi:
Ultra-long-time (0.8 s) characterization of laser phase noise with high temporal resolution (800 ps) based on heterodyne reception with FPGA data acquisition. ECOC 2020: 1-4 - [c33]Tsuyoshi Yoshida, Koji Igarashi, Magnus Karlsson, Erik Agrell:
Sparse-Dense MLC for Peak Power Constrained Channels. ECOC 2020: 1-4 - [c32]Tsuyoshi Yoshida, Koji Igarashi, Masashi Binkai, Shun Chikamori, Mikael Mazur, Jochen Schröder, Keisuke Matsuda, Shota Koshikawa, Naoki Suzuki, Magnus Karlsson, Erik Agrell:
Required and Received SNRs in Coded Modulation. ECOC 2020: 1-4 - [c31]Shohei Beppu, Koji Igarashi, Hiroshi Mukai, Masahiro Kikuta, Masahiro Shigihara, Daiki Soma, Takehiro Tsuritani, Itsuro Morita:
Real-Time Strongly-Coupled 4-Core Fiber Transmission. OFC 2020: 1-3 - [c30]Yasuhiro Kawabata, Naoki Urakawa, K. Kinoshita, Koji Igarashi:
Spectrally Slicing Coherent Optical Spectrum Analyzer for Measuring Complex Field Waveforms of Optical QAM Signals. OFC 2020: 1-3
2010 – 2019
- 2019
- [j5]Shuai Yuan, Koji Igarashi:
Simplified Iterative Decoder for Polybinary-Shaped Optical Signals in Super-Nyquist Wavelength Division Multiplexed Systems. IEICE Trans. Commun. 102-B(4): 818-823 (2019) - [j4]Naruki Shinohara, Koji Igarashi, Kyo Inoue:
Bit-Error-Rate Degradation Due to Inter-Channel Crosstalk of Different Signal Format. IEICE Trans. Commun. 102-B(5): 1000-1004 (2019) - [j3]Kyo Inoue, Koji Igarashi:
Generation Efficiency of Fiber Four-Wave Mixing for Phase-Shift Keying Signal Light. IEICE Trans. Commun. 102-B(5): 1005-1009 (2019) - [j2]Noboru Osawa, Shinsuke Ibi, Koji Igarashi, Seiichi Sampei:
EXIT Chart-Aided Design of LDPC Codes for Self-Coherent Detection with Turbo Equalizer for Optical Fiber Short-Reach Transmissions. IEICE Trans. Commun. 102-B(7): 1301-1312 (2019) - [j1]Shun Orii, Kyo Inoue, Koji Igarashi:
Reduction of Crosstalk Influence in a 7-Core Multicore Fiber by Frequency Interleave. IEICE Trans. Commun. 102-B(8): 1590-1594 (2019) - [c29]Shohei Beppu, Daiki Soma, Yuta Wakayama, Seiya Sumita, Koji Igarashi, Hidenori Takahashi, Takehiro Tsuritani:
Mode-Dependent Probabilistic Shaping for Highly-Efficient Weakly Coupled 10-Mode Fiber Transmission. OFC 2019: 1-3 - [c28]Koji Igarashi, Naoki Urakawa:
Constellation Monitor of QPSK Optical Signals Based on Spectrally-sliced Coherent Optical Spectrum Analyzers. OECC/PSC 2019: 1-3 - [c27]Gen Kawabata, Koji Igarashi:
Numerical Evaluation of Modal Crosstalk Statistics in Multiple Connectors of Weakly-coupled 10-mode Fibers. OECC/PSC 2019: 1-3 - [c26]Masahiro Kikuta, Shohei Beppu, Tomoyuki Nagai, Yasuo Saito, Takehiro Tsuritani, Koji Igarashi:
Real-Time DSP for Adaptive FIR Filters Based on LMS Algorithm. OECC/PSC 2019: 1-3 - 2018
- [c25]Koji Igarashi, Yuta Wakayama, Daiki Soma, Takehiro Tsuritani, Itsuro Morita, Kyung Jun Park, Jaekwon Ko, Byoung Yoon Kim:
Low-loss and Low-crosstalk All-fiber-based Six-mode Multiplexer and Demultiplexer for Mode-Multiplexed QAM Signals in C-band. OFC 2018: 1-3 - [c24]Noboru Osawa, Shinsuke Ibi, Koji Igarashi, Seiichi Sampei:
An Iterative Soft Interference Cancellation for Pilot-Assisted Optical-OFDM with LDPC Code Optimized by EXIT Chart. OFC 2018: 1-3 - [c23]Yuta Wakayama, Daiki Soma, Shohei Beppu, Seiya Sumita, Koji Igarashi, Takehiro Tsuritani:
266.1-Tbit/s Repeatered Transmission over 90.4-km 6-Mode Fiber Using Dual C+L-Band 6-Mode EDFA. OFC 2018: 1-3 - 2017
- [c22]Daiki Soma, Shohei Beppu, Yuta Wakayama, Yu Kawaguchi, Koji Igarashi, Takehiro Tsuritani:
257-Tbit/s Partial MIMO-based 10-Mode C+L-band WDM Transmission over 48-km FMF. ECOC 2017: 1-3 - [c21]Daiki Soma, Yuta Wakayama, Shohei Beppu, Seiya Sumita, Takehiro Tsuritani, Tetsuya Hayashi, Takuji Nagashima, Masato Suzuki, Hidenori Takahashi, Koji Igarashi, Itsuro Morita, Masatoshi Suzuki:
10.16 Peta-bit/s Dense SDM/WDM transmission over Low-DMD 6-Mode 19-Core Fibre Across C+L Band. ECOC 2017: 1-3 - [c20]Yuta Wakayama, Daiki Soma, Koji Igarashi, Hidenori Taga, Takehiro Tsuritani:
Dual C+L-Band Six-Mode Optical Amplifier with Widely Erbium-Doped Fibre. ECOC 2017: 1-3 - [c19]Daiki Soma, Yuta Wakayama, Koji Igarashi, Takehiro Tsuritani:
Partial MIMO-based 10-mode-multiplexed transmission over 81km weakly-coupled few-mode fiber. OFC 2017: 1-3 - 2016
- [c18]Masatoshi Suzuki, Daiki Soma, Koji Igarashi, Yuta Wakayama, Koki Takeshima, Yu Kawaguchi, Noboru Yoshikane, Takehiro Tsuritani, Itsuro Morita:
Ultra-dense space division multiplexing technologies towards multi-Peta bit/s optical transmission. ICTON 2016: 1-4 - [c17]Shinya Kajikawa, Takuya Akasaka, Koji Igarashi:
A new VSJ mechanism for multi-directional passivity and quick response. IROS 2016: 246-251 - [c16]Tetsuya Hayashi, Takuji Nagashima, Kazuhiro Yonezawa, Yuta Wakayama, Daiki Soma, Koji Igarashi, Takehiro Tsuritani, Takashi Sasaki:
6-Mode 19-core fiber for weakly-coupled mode-multiplexed transmission over uncoupled cores. OFC 2016: 1-3 - [c15]Koji Igarashi, Kyung Jun Park, Daiki Soma, Yuta Wakayama, Takehiro Tsuritani, Byoung Yoon Kim:
All-fiber-based selective mode multiplexer and demultiplexer for six-mode multiplexed signals. OFC 2016: 1-3 - [c14]Yuta Wakayama, Daiki Soma, Koji Igarashi, Hidenori Taga, Takehiro Tsuritani:
Intermediate mode interchange for reduction of differential mode-group delay in weakly-coupled 6-mode fiber transmission line. OFC 2016: 1-3 - 2015
- [c13]Koji Igarashi, Takehiro Tsuritani, Itsuro Morita:
Experimental study on polybinary-pulse-shaped QAM signals for highly-spectral-efficient Super-Nyquist-WDM systems. ECOC 2015: 1-3 - [c12]Daiki Soma, Koji Igarashi, Yuta Wakayama, Koki Takeshima, Yu Kawaguchi, Noboru Yoshikane, Takehiro Tsuritani, Itsuro Morita, Masatoshi Suzuki:
2.05 Peta-bit/s super-nyquist-WDM SDM transmission using 9.8-km 6-mode 19-core fiber in full C band. ECOC 2015: 1-3 - [c11]Yuta Wakayama, Hidenori Taga, Koji Igarashi, Takehiro Tsuritani:
DMD measurement of 114-SDM transmission fibre using low-coherence interferometry with digital holographic processing. ECOC 2015: 1-3 - [c10]Koji Igarashi, Daiki Soma, Yuta Wakayama, Koki Takeshima, Yu Kawaguchi, Takehiro Tsuritani, Itsuro Morita, Masatoshi Suzuki:
114 space-division-multiplexed transmission over 9.8-km weakly-coupled-6-mode uncoupled-19-core fibers. OFC 2015: 1-3 - [c9]Koki Takeshima, Takehiro Tsuritani, Yukihiro Tsuchida, Koichi Maeda, Tsunetoshi Saito, Kengo Watanabe, Toru Sasa, Katsunori Imamura, Ryuichi Sugizaki, Koji Igarashi, Itsuro Morita, Masatoshi Suzuki:
51.1-Tbit/s MCF transmission over 2, 520 km using cladding pumped 7-core EDFAs. OFC 2015: 1-3 - 2014
- [c8]Koji Igarashi, Daiki Soma, Takehiro Tsuritani:
Selective mode conversion using phase plates for 10-mode fiber. ECOC 2014: 1-3 - [c7]Koji Igarashi, Takehiro Tsuntani, Itsuro Morita:
1-Exabit/s×km super-Nyquist-WDM multi-core-fiber transmission. ECOC 2014: 1-3 - [c6]Daiki Soma, Koki Takeshima, Koji Igarashi, Takehiro Tsuritani:
Degenerate modes multiplexer/demultiplexer using Mach-Zehnder interferometer with image inversion. ECOC 2014: 1-3 - [c5]Koji Igarashi, Takehiro Tsuritani, Itsuro Morita:
Bit-error rate performance of super-Nyquist-WDM DP-QPSK signals with duobinary-pulse shaping. OFC 2014: 1-3 - [c4]Hidenori Takahashi, Koji Igarashi, Takehiro Tsuritani:
Long-haul transmission using multicore fibers. OFC 2014: 1-3 - 2013
- [c3]Changyo Han, Koji Igarashi, Kazuro Kikuchi:
Influence of channel misalignment of time-interleaved DAC on sensitivity degradation in coherent optical receivers. OFC/NFOEC 2013: 1-3 - [c2]Koji Igarashi, Takehiro Tsuritani, Itsuro Morita, Kazuhiro Katoh, Kazuro Kikuchi:
Frequency stabilization of multiple semiconductor lasers for Nyquist-WDM transmission systems. OFC/NFOEC 2013: 1-3 - [c1]Noboru Yoshikane, Koji Igarashi, Takehiro Tsuritani:
Comparison of network cost and power consumption between a single-line-rate network and a flexible-bitrate network in the beyond-100-Gb/s networks era. OFC/NFOEC 2013: 1-3
Coauthor Index
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