Koji Igarashi

Publication Activity (10 Years)

Years Active: 2013-2023
Publications (10 Years): 39

Top Topics

Transmission Line

Top Venues

IEICE Trans. Commun.

Publications

Koji Igarashi
Real-time MIMO Adaptive Equalization with Carrier-phase Recovery for Mode-division Multiplexed Optical Coherent System. OFC (2023)
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) (2023)
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)
Shohei Beppu, Masahiro Kikuta, Daiki Soma, Y. Yaegashi, Koji Igarashi, Masahiro Shigihara, K. Aizawa, Noboru Yoshikane, Takehiro Tsuritani
Real-time 6-Mode 19-Core Fiber Transmission. OFC (2023)
Koji Igarashi, Takumi Takahashi, Seiichi Sampei, Kyo Inoue
Soft-decision FEc Designed for Optically Preamplified PAM4 Direct Detection. OECC/PSC (2022)
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)
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) (2022)
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)
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)
Tsuyoshi Yoshida, Koji Igarashi, Magnus Karlsson, Erik Agrell
Compressed Shaping: Concept and FPGA Demonstration. CoRR (2021)
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)
Hiroki Kawahara, Kyo Inoue, Koji Igarashi
Analysis of Signal Distribution in ASE-Limited Optical On-Off Keying Direct-Detection Systems. IEICE Trans. Commun. (11) (2021)
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)
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)
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)
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)
Tsuyoshi Yoshida, Koji Igarashi, Magnus Karlsson, Erik Agrell
Sparse-Dense MLC for Peak Power Constrained Channels. ECOC (2020)
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)
Gen Kawabata, Koji Igarashi
Numerical Evaluation of Modal Crosstalk Statistics in Multiple Connectors of Weakly-coupled 10-mode Fibers. OECC/PSC (2019)
Kyo Inoue, Koji Igarashi
Generation Efficiency of Fiber Four-Wave Mixing for Phase-Shift Keying Signal Light. IEICE Trans. Commun. (5) (2019)
Shuai Yuan, Koji Igarashi
Simplified Iterative Decoder for Polybinary-Shaped Optical Signals in Super-Nyquist Wavelength Division Multiplexed Systems. IEICE Trans. Commun. (4) (2019)
Koji Igarashi, Naoki Urakawa
Constellation Monitor of QPSK Optical Signals Based on Spectrally-sliced Coherent Optical Spectrum Analyzers. OECC/PSC (2019)
Shun Orii, Kyo Inoue, Koji Igarashi
Reduction of Crosstalk Influence in a 7-Core Multicore Fiber by Frequency Interleave. IEICE Trans. Commun. (8) (2019)
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. (7) (2019)
Naruki Shinohara, Koji Igarashi, Kyo Inoue
Bit-Error-Rate Degradation Due to Inter-Channel Crosstalk of Different Signal Format. IEICE Trans. Commun. (5) (2019)
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)
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)
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)
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)
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)
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)
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)
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)
Daiki Soma, Yuta Wakayama, Koji Igarashi, Takehiro Tsuritani
Partial MIMO-based 10-mode-multiplexed transmission over 81km weakly-coupled few-mode fiber. OFC (2017)
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)
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)
Shinya Kajikawa, Takuya Akasaka, Koji Igarashi
A new VSJ mechanism for multi-directional passivity and quick response. IROS (2016)
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)
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)
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)
Koji Igarashi, Takehiro Tsuritani, Itsuro Morita
Experimental study on polybinary-pulse-shaped QAM signals for highly-spectral-efficient Super-Nyquist-WDM systems. ECOC (2015)
Koki Takeshima, Takehiro Tsuritani, Yukihiro Tsuchida, Koichi Maeda, T. Saito, Kengo Watanabe, T. Sasa, Katsunori Imamura, Ryuichi Sugizaki, Koji Igarashi, Itsuro Morita, M. Suzuki
51.1-Tbit/s MCF transmission over 2, 520 km using cladding pumped 7-core EDFAs. OFC (2015)
Daiki Soma, Koji Igarashi, Yuta Wakayama, Koki Takeshima, Y. Kawaguchi, Noboru Yoshikane, Takehiro Tsuritani, Itsuro Morita, M. 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)
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)
Koji Igarashi, Takehiro Tsuntani, Itsuro Morita
1-Exabit/s×km super-Nyquist-WDM multi-core-fiber transmission. ECOC (2014)
Daiki Soma, Koki Takeshima, Koji Igarashi, Takehiro Tsuritani
Degenerate modes multiplexer/demultiplexer using Mach-Zehnder interferometer with image inversion. ECOC (2014)
Koji Igarashi, Takehiro Tsuritani, Itsuro Morita
Bit-error rate performance of super-Nyquist-WDM DP-QPSK signals with duobinary-pulse shaping. OFC (2014)
Koji Igarashi, Daiki Soma, Takehiro Tsuritani
Selective mode conversion using phase plates for 10-mode fiber. ECOC (2014)
Hidenori Takahashi, Koji Igarashi, Takehiro Tsuritani
Long-haul transmission using multicore fibers. OFC (2014)
Koji Igarashi, Takehiro Tsuritani, Itsuro Morita, Kazuhiro Katoh, Kazuro Kikuchi
Frequency stabilization of multiple semiconductor lasers for Nyquist-WDM transmission systems. OFC/NFOEC (2013)
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)
Changyo Han, Koji Igarashi, Kazuro Kikuchi
Influence of channel misalignment of time-interleaved DAC on sensitivity degradation in coherent optical receivers. OFC/NFOEC (2013)