Toshihiko Hirooka

61 papers Misc 1Journal 19Unranked 41
YearRankTypeTitle / Venue / Authors
2025 — conf
Novel Polarization-Dependence-Free Optical Injection-Locking Circuit Using $\lambda / 4$ Phase-Shift-Free HR DFB LD at $1.5 \mu ~\mathrm{m}$.
ECOC
Keisuke Kasai, Shun Otsu, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2024 — conf
Mode Division Multiplexed Coherent Optical Transmission in Time Domain by Using Higher-order Hermite-Gaussian Pulses.
OFC
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
2024 — conf
New GAWBS Noise Interacting with Longitudinally Propagating Acoustic Waves in Few-mode Fibers.
OFC
Masato Yoshida, Takaaki Hirai, Shohei Beppu, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa, Yuta Wakayama, Noboru Yoshikane
2023 J jnl
Demodulation Performance Comparison of High-Speed Coherent Nyquist Pulse Signal with Analog and Digital Demultiplexing Schemes.
IEICE Trans. Commun.
Masato Yoshida, Kosuke Kimura, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
2022 — conf
10.2 Tbit/s (1.28 Tbit/s/ch x 8 ch) WDM Nyquist Pulse Transmission over 2100 km.
OECC/PSC
Aoi Watanabe, Aoto Ishikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2022 — conf
Demodulation Performance Comparison of 160 Gbaud Coherent Nyquist Pulse Signal with Analog and Digital DEMUX Schemes.
OECC/PSC
Masato Yoshida, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2022 J jnl
Experimental and Numerical Analysis of Ultrahigh-Speed Coherent Nyquist Pulse Transmission with Low-Nonlinearity Dispersion Compensator.
IEICE Trans. Commun.
Kosuke Kimura, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2022 J jnl
Precise Measurements and their Analysis of GAWBS-Induced Depolarization Noise in Multi-Core Fiber for Digital Coherent Transmission.
IEICE Trans. Commun.
Masato Yoshida, Kozo Sato, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
2021 — conf
64 Gbit/s, 256 QAM Transmission Through Coherent Optical-Wireless Link at 61 GHz Using Simple and High OSNR Carrier Frequency Converter.
OFC
Keisuke Kasai, Taisei Sato, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2021 — conf
Broadband Dynamic Injection-Locking Performance of Fabry-Perot LD and Its Application to Coherent Homodyne Receiver.
OFC
Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2021 — conf
GAWBS Noise Correlation Between Cores in Four-Core Fiber.
OFC
Kozo Sato, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2021 J jnl
Recent progress and challenges toward ultrahigh-speed transmission beyond 10 Tbit/s with optical Nyquist pulses.
IEICE Electron. Express
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
2020 — conf
10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 km.
OFC
Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2020 — conf
64 Gbit/s, 256 QAM Coherently-Linked Optical and Wireless Transmission in 61 GHz Band Using Novel Injection-Locked Carrier Frequency Converter.
ECOC
Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2020 — conf
Experimental and Theoretical Analyses of GAWBS Phase Noise in Multi-Core Fiber for Digital Coherent Transmission.
OFC
Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2019 — conf
Dual-Polarization On-Line 256 and 512 QAM Digital Coherent Transmission.
OFC
Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2019 — conf
GAWBS Noise Characteristics in Digital Coherent Transmission in Various Optical Fibers.
OECC/PSC
Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2019 — conf
Real-Time 256 QAM Bi-directional Coherent Transmission in Next Generation Mobile Fronthaul.
OECC/PSC
Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2019 — conf
Sub-Picosecond Optical Switch over Entire C-Band by Using Nonlinear Optical Loop Mirror.
OECC/PSC
Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2019 J jnl
Wavelength-tunable sub-picosecond optical switch over entire C-band using nonlinear optical loop mirror.
IEICE Electron. Express
Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2018 — conf
Backward-Rayleigh-Scattering Suppressed 160 Gbit/s 256 QAM Injection-Locked Bidirectional Coherent Transmission for Next Generation Mobile Fronthaul.
ECOC
Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa
2018 — conf
Experimental and Numerical Comparison of Probabilistically-Shaped 4096 QAM and Uniformly-Shaped 1024 QAM in All-Raman Amplified 160 km Transmission.
OFC
Seiji Okamoto, Masaki Terayama, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2018 — conf
Injection-locked Homodyne Detection for Higher-order QAM Transmission.
OFC
Keisuke Kasai, Yixin Wang, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2018 — conf
Observation of Guided Acoustic-Wave Brillouin Scattering and its Digital Compensation in Coherent QAM Transmission.
OFC
Masataka Nakazawa, Masaki Terayama, Seiji Okamoto, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka
2018 — conf
Single-Channel 10.2 Tbit/s PDM-DQPSK Nyquist Pulse Transmission over 300 km.
ECOC
Toshihiko Hirooka, Ryoya Hirata, Jianping Wang, Masato Yoshida, Masataka Nakazawa
2017 — conf
80 Gbit/s/ch, 256 QAM Digital Coherent Optical Transmission System with Injection-Locking for Next Generation Mobile Fronthaul Network.
ECOC
Keisuke Kasai, Yixin Wang, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa
2017 J jnl
A 40 GHz, 770 fs regeneratively mode-locked erbium fiber laser operating at 1.6 µm.
IEICE Electron. Express
Koudai Harako, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2017 — conf
A New Optical Phase-Locked System Between Ultrashort Pulses for 640 Gbaud Nyquist OTDM Coherent QAM Transmission.
ECOC
Kosuke Kimura, Junpei Nitta, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2017 — conf
Fabrication of multi core fiber by using slurry casting method.
OFC
Jun Yamamoto, Tamotsu Yajima, Yusuke Kinoshita, Futoshi Ishii, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2017 — conf
Single-carrier 552 Gbit/s, 46 Gbaud 64 QAM Coherent Transmission over 100 km with Co-propagating 10 Gbit/s-OOK Signals Through a Deployed ROADM Network.
ECOC
Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada
2017 — conf
Single-channel 3.84 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with frequency-stabilized and mode-locked laser.
OFC
Masato Yoshida, Junpei Nitta, Kosuke Kimura, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2016 J jnl
A 1.55 µm, 271 fs and 1.07 µm, 294 fs simultaneously mode-locked Er- and Yb-doped fiber laser with a single SWNT/PVA saturable absorber.
IEICE Electron. Express
Masatoshi Nakao, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2016 J jnl
Fabrication of OH-free, single-mode fiber by using slurry casting and rod-in-tube method.
IEICE Electron. Express
Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2016 — conf
Fused type fan-out device for multi-core fiber based on bundled structure.
OFC
Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2016 — conf
Mode coupling measurement at a splice point between few-mode fibers using a synchronous multi-channel OTDR.
OFC
Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2015 — conf
Ad-hoc photonic network based on movable and deployable ICT resource unit to meet rapidly changing service demands.
OFC
Toshikazu Sakano, Tetsuro Komukai, Atsushi Takahara, Toshihiko Hirooka, Masataka Nakazawa
2015 J jnl
First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal.
IEICE Electron. Express
Toshihiko Hirooka, Keisuke Kasai, Yixin Wang, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada
2015 Misc conf
QAM quantum noise stream cipher using digital coherent optical transmission.
ACSSC
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
2015 — conf
Real-time 10 Gbit/s-16 QAM quantum stream cipher transmission over 320 km with FPGA-based transmitter and receiver.
OFC
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
2015 — conf
Real-time adaptive 4-64 QAM, 20-60 Gbit/s quantum noise stream cipher transmission over 320 km with FPGA-based transmitter and receiver.
ECOC
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
2015 — conf
Single-channel 1.92 Tbit/s, 64 QAM coherent orthogonal TDM transmission of 160 Gbaud optical Nyquist pulses with 10.6 bit/s/Hz spectral efficiency.
OFC
David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2014 — conf
1.92 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 7.5 bit/s/Hz.
OFC
David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2014 — conf
100 Gbit/s DP-QPSK transmission over a 32 km legacy multi-mode GI fiber using a real-time digital coherent transceiver.
OFC
Toshihiko Hirooka, Masataka Nakazawa, Tetsuro Komukai, Toshikazu Sakano
2014 J jnl
100 Gbit/s real-time digital coherent transmission over a 32 km legacy multi-mode graded-index fiber.
IEICE Electron. Express
Toshihiko Hirooka, Masataka Nakazawa, Tetsuro Komukai, Toshikazu Sakano
2014 — conf
A single-channel 960 Gbit/s 64 QAM orthogonal TDM transmission with a spectral efficiency of 10.0 bit/s/Hz using coherent Nyquist pulses.
ECOC
David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2014 — conf
All-optical high-performance demultiplexing using optical Nyquist pulse sampling.
OFC
Daiki Seya, Koudai Harako, Toshihiko Hirooka, Masataka Nakazawa
2014 — conf
Measurement of mode coupling distribution along a few-mode fiber using a synchronous multi-channel OTDR.
OFC
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
2014 — conf
Novel ultrafast TDM demultiplexing scheme using orthogonality in coherent Nyquist pulses.
ECOC
Koudai Harako, David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
2014 — conf
OH-free low loss single-mode fibre fabricated by slurry casting / rod-in-tube method.
ECOC
Tamotsu Yajima, Jun Yamamoto, Yusuke Kinoshita, Futoshi Ishii, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa
2014 J jnl
Plug-and-Play Optical Interconnection Using Digital Coherent Technology for Resilient Network Based on Movable and Deployable ICT Resource Unit.
IEICE Trans. Commun.
Tetsuro Komukai, Hirokazu Kubota, Toshikazu Sakano, Toshihiko Hirooka, Masataka Nakazawa
2014 — conf
Real-time adaptive 4-64 QAM coherent optical transmission over 320 km with FPGA-based transmitter and receiver.
ECOC
Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Masataka Nakazawa
2014 J jnl
Tool Motion Control Referring to Voxel Information of Removal Volume Voxel Model to Achieve Autonomous Milling Operation.
Int. J. Autom. Technol.
Tomokazu Kobayashi, Toshihiko Hirooka, Atsushi Hakotani, Ryuta Sato, Keiichi Shirase
2013 — conf
A single-channel, 1.6 Tbit/s 32 QAM coherent pulse transmission over 150 km with RZ-CW conversion and FDE techniques.
OFC/NFOEC
David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa, Tokutaka Hara, Satoshi Oikawa
2013 — conf
Large PMD tolerant 1.28 Tbit/s/ch transmission over 525 km with 640 Gbaud optical Nyquist pulses.
OFC/NFOEC
Koudai Harako, Peng Ruan, Toshihiko Hirooka, Masataka Nakazawa
2013 J jnl
Surface Roughness Control Based on Digital Copy Milling Concept to Achieve Autonomous Milling Operation.
Int. J. Autom. Technol.
Toshihiko Hirooka, Tomokazu Kobayashi, Atsushi Hakotani, Ryuta Sato, Keiichi Shirase
2011 J jnl
Single-Channel 1.28 Tbit/s-525 km DQPSK Transmission Using Ultrafast Time-Domain Optical Fourier Transformation and Nonlinear Optical Loop Mirror.
IEICE Trans. Commun.
Pengyu Guan, Hans Christian Hansen Mulvad, Yutaro Tomiyama, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa
2009 J jnl
10Gbit/s photonic crystal fiber transmissions with 1.1µm directly-modulated single-mode VCSEL.
IEICE Electron. Express
Kengo Koizumi, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2007 J jnl
Ultra-Stable Regeneratively Mode-Locked Laser as an Opto-Electronic Microwave Oscillator and Its Application to Optical Metrology.
IEICE Trans. Electron.
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
2006 J jnl
10Gb/s transmission over 5km at 850nm using single-mode photonic crystal fiber, single-mode VCSEL, and Si-APD.
IEICE Electron. Express
Hideaki Hasegawa, Yosuke Oikawa, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
2006 J jnl
ABCD matrix formalism of time-domain optical Fourier transformation for distortion-free pulse transmission.
IEICE Electron. Express
Masataka Nakazawa, Toshihiko Hirooka
2006 J jnl
Comparison of 40GHz optical demultiplexers using SMZ switch and EA modulator in 160Gbit/s-500km OTDM transmission.
IEICE Electron. Express
Toshihiko Hirooka, Takashi Kumakura, Kou Osawa, Masataka Nakazawa