Koji Igarashi

发表

Generation Efficiency of Fiber Four-Wave Mixing for Phase-Shift Keying Signal Light

Kyo Inoue, Koji Igarashi, Kyo Inoue, 2019, IEICE Trans. Commun..

First Demonstration of MC-EDFA-Repeatered SDM Transmission of 40 × 128-Gbit/s PDM-QPSK Signals per Core over 6,160-km 7-core MCF

Takehiro Tsuritani, Masatoshi Suzuki, Ryuichi Sugizaki, 2012 .

Report on ECOC2013 -- Point-To-Point Transmission Systems

Takehiro Tsuritani, Koji Igarashi, T. Tsuritani, 2013 .

A Highly Nonlinear Fiber Module and its Application to the Generation of Ultra-High Repetition-Rate Sub-Picosecond Optical Pulse Trains

Shu Namiki, Masanori Takahashi, Takeshi Yagi, 2004 .

Real-Time Strongly-Coupled 4-Core Fiber Transmission

Takehiro Tsuritani, Daiki Soma, Itsuro Morita, 2020, 2020 Optical Fiber Communications Conference and Exhibition (OFC).

Iterative decoding between feed-forward carrier recovery and FEC decoding to compensate for laser phase noise

Shuai Yuan, Koji Igarashi, 2017, 2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC).

Transmission of 160-Gbit/s QPSK signals on a single carrier over 1,000 km using digital coherent receivers

Yojiro Mori, Chao Zhang, Koji Igarashi, 2009, 2009 35th European Conference on Optical Communication.

Real-Time DSP for Adaptive FIR Filters Based on LMS Algorithm

Takehiro Tsuritani, Koji Igarashi, Yasuo Saito, 2019, 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC).

MAP Decoder for Nonlinear Compensation in WDM DP-QPSK Systems

Shuai Yuan, Koji Igarashi, 2018, 2018 Asia Communications and Photonics Conference (ACP).

Intermediate mode interchange for reduction of differential mode-group delay in weakly-coupled 6-mode fiber transmission line

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

Long-haul transmission using multicore fibers

Takehiro Tsuritani, Hidenori Takahashi, Koji Igarashi, 2014, OFC.

Turbo Equalization with 20%-overhead Turbo Code in Super-Nyquist WDM Systems

Takehiro Tsuritani, Itsuro Morita, Shuai Yuan, 2016 .

Maximum-likelihood-sequence estimation for 30-Gbit/s 8-PSK signals using digital coherent receivers

Chao Zhang, Koji Igarashi, Kazuro Kikuchi, 2009 .

A method and video game system for producing a field Planes

Keisuke Fukuda, Koji Igarashi, Hiroto Yamaguchi, 2000 .

Real-Time All-Optical Waveform Sampling Using a Free-Running Passively Mode-Locked Fiber Laser as the Sampling Pulse Source

Takuo Tanemura, Koji Igarashi, Kazuro Kikuchi, 2006 .

114 space-division-multiplexed transmission over 9.8-km weakly-coupled-6-mode uncoupled-19-core fibers

Takehiro Tsuritani, Masatoshi Suzuki, Daiki Soma, 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

Simplified Iterative Decoder for Polybinary-Shaped Optical Signals in Super-Nyquist Wavelength Division Multiplexed Systems

Shuai Yuan, Koji Igarashi, K. Igarashi, 2019, IEICE Trans. Commun..

Long-haul transmission using multicore fibers

Takehiro Tsuritani, Hidenori Takahashi, Koji Igarashi, 2014, OFC 2014.

A new VSJ mechanism for multi-directional passivity and quick response

Shinya Kajikawa, Koji Igarashi, Takuya Akasaka, 2016, 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

Bit-Error Ratio Performance Improvement Using Iterative Decoding for Polybinary-Shaped Super-Nyquist Wavelength Division Multiplexed Signals

Takehiro Tsuritani, Itsuro Morita, Shuai Yuan, 2017, Journal of Lightwave Technology.

Selective mode conversion using phase plates for 10-mode fiber

Takehiro Tsuritani, Koji Igarashi, Daiki Souma, 2014, 2014 The European Conference on Optical Communication (ECOC).

Equalization of nonlinear transmission impairments by maximum-likelihood-sequence estimation in digital coherent receivers.

Chao Zhang, Koji Igarashi, Kazuro Kikuchi, 2010, Optics express.

Frequency interleave in multicore fiber transmission systems for reducing influence of inter-core crosstalk

Kyo Inoue, Koji Igarashi, Shohei Okada, 2016 .

Spectrally Slicing Coherent Optical Spectrum Analyzer for Measuring Complex Field Waveforms of Optical QAM Signals

Koji Igarashi, Y. Kawabata, N. Urakawa, 2020, 2020 Optical Fiber Communications Conference and Exhibition (OFC).

257-Tbit/s Partial MIMO-based 10-Mode C+L-band WDM Transmission over 48-km FMF

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2017, 2017 European Conference on Optical Communication (ECOC).

Improvement on Post-FEC BER Performance by Iterative Decoding Between a Feed-forward Carrier-Phase Estimator and an FEC Decoder

Shuai Yuan, Koji Igarashi, 2017, 2017 Asia Communications and Photonics Conference (ACP).

Adaptive equalization combined with maximum likelihood decoder for trellis code modulation based on high-order QAM signals

Koji Igarashi, 2017, 2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC).

10.16 Peta-bit/s Dense SDM/WDM transmission over Low-DMD 6-Mode 19-Core Fibre Across C+L Band

Takehiro Tsuritani, Masato Suzuki, Masatoshi Suzuki, 2017, 2017 European Conference on Optical Communication (ECOC).

All-fiber-based selective mode multiplexer and demultiplexer for six-mode multiplexed signals

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

Multi-impairment monitoring from adaptive finite-impulse-response filters in a digital coherent receiver.

Yojiro Mori, Chao Zhang, Koji Igarashi, 2010, Optics express.

Bit-error rate performance of super-Nyquist-WDM DP-QPSK signals with duobinary-pulse shaping

Takehiro Tsuritani, Koji Igarashi, Itsuro Morita, 2014, OFC.

Reduction of Crosstalk Influence in a 7-Core Multicore Fiber by Frequency Interleave

Kyo Inoue, Koji Igarashi, Shun Orii, 2019, IEICE Trans. Commun..

Constellation Monitor of QPSK Optical Signals Based on Spectrally-sliced Coherent Optical Spectrum Analyzers

Koji Igarashi, Naoki Urakawa, 2019, 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC).

1-Exabit/s×km super-Nyquist-WDM multi-core-fiber transmission

Itsuro Morita, Koji Igarashi, Takehiro Tsuntani, 2014, 2014 The European Conference on Optical Communication (ECOC).

Bit-Error-Rate Degradation Due to Inter-Channel Crosstalk of Different Signal Format

Kyo Inoue, Koji Igarashi, Naruki Shinohara, 2019, IEICE Trans. Commun..

Optoelectronic regeneration of binary phase-shift keying optical signals based on a feed-forward control of a LiNbO3 intensity modulator

Kyo Inoue, Koji Igarashi, Shohei Okada, 2014, 2014 OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology.

Ultra-long-haul transmission using multicore fiber repeatered by multicore EDFA

Takehiro Tsuritani, Itsuro Morita, Hidenori Takahashi, 2013, 2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching (OECC/PS).

Bit-error rate performance of super-Nyquist-WDM DP-QPSK signals with duobinary-pulse shaping

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2014, OFC 2014.

An Iterative Soft Interference Cancellation for Pilot-Assisted Optical-OFDM with LDPC Code Optimized by EXIT Chart

Shinsuke Ibi, Seiichi Sampei, Koji Igarashi, 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

266.1-Tbit/s Repeatered Transmission over 90.4-km 6-Mode Fiber Using Dual C+L-Band 6-Mode EDFA

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

Turbo equalization for duobinary-shaped signals in Super-Nyquist WDM systems

Shuai Yuan, Koji Igarashi, 2016, 2016 21st OptoElectronics and Communications Conference (OECC) held jointly with 2016 International Conference on Photonics in Switching (PS).

Low-loss and Low-crosstalk All-fiber-based Six-mode Multiplexer and Demultiplexer for Mode-Multiplexed QAM Signals in C-band

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

6-Mode 19-core fiber for weakly-coupled mode-multiplexed transmission over uncoupled cores

Takehiro Tsuritani, Takashi Sasaki, Daiki Soma, 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

Partial MIMO-based 10-mode-multiplexed transmission over 81km weakly-coupled few-mode fiber

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).

Mode-Dependent Probabilistic Shaping for Highly-Efficient Weakly Coupled 10-Mode Fiber Transmission

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2019, 2019 Optical Fiber Communications Conference and Exhibition (OFC).

A coherent Ising machine for 2000-node optimization problems

Ken-ichi Kawarabayashi, Kazuyuki Aihara, Takeshi Umeki, 2016, Science.

Numerical Evaluation of Modal Crosstalk Statistics in Multiple Connectors of Weakly-coupled 10-mode Fibers

Koji Igarashi, Gen Kawabata, 2019, 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC).

Dual C+L-Band Six-Mode Optical Amplifier with Widely Erbium-Doped Fibre

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2017, 2017 European Conference on Optical Communication (ECOC).

EXIT Chart-Aided Design of LDPC Codes for Self-Coherent Detection with Turbo Equalizer for Optical Fiber Short-Reach Transmissions

Shinsuke Ibi, Seiichi Sampei, Koji Igarashi, 2019, IEICE Trans. Commun..

Real-Time Implementation of Adaptive MIMO Equalization with Fast Carrier-Phase Tracking

Takehiro Tsuritani, Daiki Soma, Koji Igarashi, 2020 .

Experimental study on polybinary-pulse-shaped QAM signals for highly-spectral-efficient Super-Nyquist-WDM systems

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2015, 2015 European Conference on Optical Communication (ECOC).

Degenerate modes multiplexer/demultiplexer using Mach-Zehnder interferometer with image inversion

Takehiro Tsuritani, Daiki Soma, Koji Igarashi, 2014, 2014 The European Conference on Optical Communication (ECOC).

Sub-100 fs Higher Order Soliton Compression in Dispersion-Flattened Fibers

Masahiro Tsuchiya, Koji Igarashi, S. Saito, 2002 .

Mode-multiplexed 16QAM transmission over 60-km coupled four-core fibres using real-time MIMO-DSP with high-accuracy frequency offset estimation

Noboru Yoshikane, Takehiro Tsuritani, Daiki Soma, 2021, 2021 European Conference on Optical Communication (ECOC).

FPGA Implementation of Hierarchical Subcarrier Rate and Distribution Matching for up to 1.032 Tb/s or 262144-QAM

Yoshiaki Konishi, Erik Agrell, Magnus Karlsson, 2021, 2021 Optical Fiber Communications Conference and Exhibition (OFC).

Real-time Transoceanic Coupled 4-core Fiber Transmission

Noboru Yoshikane, Takehiro Tsuritani, Daiki Soma, 2021, 2021 Optical Fiber Communications Conference and Exhibition (OFC).

Real-time MIMO-DSP Technologies for SDM Systems

Noboru Yoshikane, Takehiro Tsuritani, Daiki Soma, 2021, 2021 Optical Fiber Communications Conference and Exhibition (OFC).

Analysis of signal distribution in ASE-limited optical on-off keying direct-detection systems

Kyo Inoue, Koji Igarashi, Hiroki Kawahara, 2021 .

Compressed Shaping: Concept and FPGA Demonstration

Erik Agrell, Magnus Karlsson, Tsuyoshi Yoshida, 2021, Journal of Lightwave Technology.

Higher-Order Soliton Compression of Optical Pulses from 5 ps to 20 fs by a 15.1-m-long Single-Stage Step-like Dispersion Profiled Fiber

Masato Kishi, Masahiro Tsuchiya, Koji Igarashi, 2001 .

Straight-line 1,073-km transmission of 640-Gbit/s dual-polarization QPSK signals on a single carrier

Yojiro Mori, Chao Zhang, Koji Igarashi, 2009, 2009 35th European Conference on Optical Communication.

Second-order PMD monitoring from adaptive FIR-filter tap coefficients in a digital coherent receiver

Yojiro Mori, Chao Zhang, Koji Igarashi, 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

1 Exabit/s·km transmission with multi-core fiber and spectral efficient modulation format

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2014, 2014 OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology.

51.1-Tbit/s MCF Transmission Over 2520 km Using Cladding-Pumped Seven-Core EDFAs

Takehiro Tsuritani, Ryuichi Sugizaki, Itsuro Morita, 2016, Journal of Lightwave Technology.

Sub-100 fs SDPF optical soliton compressor for diode laser pulses

Masahiro Tsuchiya, K. Taira, Koji Igarashi, 2001 .

Demodulation of 1.28-Tbit/s polarization-multiplexed 16-QAM signals on a single carrier with digital coherent receiver

Yojiro Mori, Chao Zhang, Koji Igarashi, 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver.

Yojiro Mori, Chao Zhang, Koji Igarashi, 2009, Optics express.

Effective area measurement of few-mode fiber using far field scan technique with Hankel transform generalized for circularly-asymmetric mode.

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2018, Optics express.

110.9-Tbit/s SDM transmission over 6,370 km using a full C-band seven-core EDFA.

Takehiro Tsuritani, Ryuichi Sugizaki, Itsuro Morita, 2013, Optics express.

Super-Nyquist-WDM transmission over 7,326-km seven-core fiber with capacity-distance product of 1.03 Exabit/s · km.

Takehiro Tsuritani, Ryuichi Sugizaki, Itsuro Morita, 2014, Optics express.

266.1-Tbit/s Transmission Over 90.4-km 6-Mode Fiber With Inline Dual C+L-Band 6-Mode EDFA

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2019, Journal of Lightwave Technology.

Optoelectronic time-division demultiplexing of 160-Gbit/s optical signal based on phase modulation and spectral filtering.

Koji Igarashi, Kazuro Kikuchi, K. Kikuchi, 2007, Optics express.

257-Tbit/s Weakly Coupled 10-Mode C + L-Band WDM Transmission

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2018, Journal of Lightwave Technology.

Ultra-Long-Haul High-Capacity Super-Nyquist-WDM Transmission Experiment Using Multi-Core Fibers

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2015, Journal of Lightwave Technology.

Six-Mode 19-Core Fiber With 114 Spatial Modes for Weakly-Coupled Mode-Division-Multiplexed Transmission

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2017, Journal of Lightwave Technology.

Broad-band and extremely flat super-continuum generation via optical parametric gain extended spectrally by fourth-order dispersion in anomalous-dispersion-flattened fibers

Masato Kishi, Masahiro Tsuchiya, Koji Igarashi, 2002 .

Multicore erbium doped fiber amplifier with 5 THz bandwidth, high-gain and low NF

Takehiro Tsuritani, Ryuichi Sugizaki, Itsuro Morita, 2013, 2013 IEEE Photonics Society Summer Topical Meeting Series.

Weakly-coupled Few-mode Fiber Transmission with Partial MIMO DSP

Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, 2017 .

Generation of 10-GHz, 2-ps optical pulse train with high extinction ratio and low timing jitter from a continuous wave tunable over the entire C band

Koji Igarashi, Kazuro Kikuchi, Kazuhiro Katoh, 2005 .

Demodulation of 320-Gbit/s Optical Quadrature Phase-shift Keying Signal with Digital Coherent Receiver having Time-division Demultiplexing Function

Yojiro Mori, Koji Igarashi, Chao Zhang, 2008, OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference.

1-Exabit/s·km Super-Nyquist-WDM transmission using multi-core fibers

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2014, 2014 12th International Conference on Optical Internet 2014 (COIN).

Ultra-dense spatial-division-multiplexed optical fiber transmission over 6-mode 19-core fibers.

Noboru Yoshikane, Takehiro Tsuritani, Daiki Soma, 2016, Optics express.

Demodulation of 640-Gbit/s Polarization-Multiplexed OTDM QPSK Signals Using a Digital Coherent Receiver

Chao Zhang, Yojiro Mori, Koji Igarashi, 2008 .

Polybinary Shaping for Highly-Spectral-Efficient Super-Nyquist WDM QAM Signals

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2016, Journal of Lightwave Technology.

Ultrafast digital coherent receiver based on parallel processing of decomposed frequency subbands

Yojiro Mori, Chao Zhang, Koji Igarashi, 2010, 36th European Conference and Exhibition on Optical Communication.

Weakly coupled 10-mode-division multiplexed transmission over 48-km few-mode fibers with real-time coherent MIMO receivers.

Takehiro Tsuritani, Daiki Soma, Itsuro Morita, 2020, Optics express.

Performance evaluation of selective mode conversion based on phase plates for a 10-mode fiber.

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2014, Optics express.

200-km transmission of 100-Gbit/s 32-QAM dual-polarization signals using a digital coherent receiver

Yojiro Mori, Chao Zhang, Koji Igarashi, 2009, 2009 35th European Conference on Optical Communication.

Bit-error rate performance of Nyquist wavelength-division multiplexed quadrature phase-shift keying optical signals

Yojiro Mori, Koji Igarashi, Kazuro Kikuchi, 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

1.03-Exabit/s.km Super-Nyquist-WDM Transmission over 7,326-km Seven-Core Fiber

Takehiro Tsuritani, Ryuichi Sugizaki, Itsuro Morita, 2013 .

Higher-order mode conversion using cascaded phase plates

Takehiro Tsuritani, Itsuro Morita, Koji Igarashi, 2013, 2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching (OECC/PS).

All-fiber-based selective mode multiplexer and demultiplexer for weakly-coupled mode-division multiplexed systems

Itsuro Morita, Koji Igarashi, Byoung Yoon Kim, 2018 .

Trans-oceanic class ultra-long-haul transmission using multi-core fiber.

Takehiro Tsuritani, Itsuro Morita, Hidenori Takahashi, 2014, Optics express.

Selective mode multiplexer based on phase plates and Mach-Zehnder interferometer with image inversion function.

Takehiro Tsuritani, Koji Igarashi, Koki Takeshima, 2015, Optics express.

Characterization of semiconductor-laser phase noise with digital coherent receivers

Koji Igarashi, Kazuro Kikuchi, K. Kikuchi, 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.