Takeshi Umeki

43 papers C 1Journal 8Unranked 34
YearRankTypeTitle / Venue / Authors
2025 — conf
27-THz ISRS-Supported Transmission Over 1040 km in S+C+L+U and Extreme Longer-Wavelength Band.
OFC
Shimpei Shimizu, Kosuke Kimura, Akira Kawai, Masashi Abe, Shunya Konno, Takushi Kazama, Masanori Nakamura, Fukutaro Hamaoka, Koji Enbutsu, Takahiro Kashiwazaki, Munehiko Nagatani, Hitoshi Wakita, Yuta Shiratori, Hiroshi Yamazaki, Hiroyuki Takahashi, Takeshi Umeki, Takayuki Kobayashi, Yutaka Miyamoto
2025 — conf
9-THz Wideband PPLN-Based Wavelength Converter for Simultaneous Conversion of C+L-Band WDM Signal to Full S-Band.
OFC
Shunya Konno, Shimpei Shimizu, Masashi Abe, Takushi Kazama, Koji Enbutsu, Takahiro Kashiwazaki, Masanori Nakamura, Takayuki Kobayashi, Yutaka Miyamoto, Takeshi Umeki
2024 — conf
C+L+U-Band 14.85-THz WDM Transmission Over 80-km-Span G.654.E Fiber with Hybrid PPLN-OPA/EDFA U-Band Lumped Repeater Using 144-Gbaud PCS-QAM Signals.
OFC
Takayuki Kobayashi, Shimpei Shimizu, Akira Kawai, Masanori Nakamura, Masashi Abe, Takushi Kazama, Takeshi Umeki, Munehiko Nagatani, Kosuke Kimura, Hitoshi Wakita, Yuta Shiratori, Fukutaro Hamaoka, Hiroshi Yamazaki, Hiroyuki Takahashi, Yutaka Miyamoto
2024 — conf
Cascadability of PPLN-Based Inter-Band Wavelength Conversion for Band-Switchable Multi-Band Optical Cross-Connect.
OFC
Haruka Minami, Takafumi Fukatani, Masahiro Nakagawa, Takeshi Seki, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Koji Enbutsu, Takeshi Umeki, Rie Hayashi, Takeshi Kuwahara
2024 — conf
Double-decker CDC-ROADM node for multi-band network with wavelength band granularity.
OFC
Kenya Suzuki, Masashi Ota, Yoshie Morimoto, Keita Yamaguchi, Fukutaro Hamaoka, Shuto Sugawara, Takeo Sasai, Takayuki Kobayashi, Masanori Nakamura, Satomi Katayose, Takeshi Umeki, Daisuke Ogawa, Yiran Ma, Stefano Camatel, Mitsunori Fukutoku, Yutaka Miyamoto, Osamu Moriwaki
2024 — conf
Highly rectangular SCL-band MUX/DEMUX filter using compact cascaded arrayed waveguide gratings.
OFC
Masashi Ota, Kenya Suzuki, Keita Yamaguchi, Takeshi Umeki, Satomi Katayose, Osamu Moriwaki
2024 — conf
Modeling and Experimental Verification in S+C+L+U Quadrable-Band WDM Transmission System using C+L-Band Transceivers and Wavelength Converters.
OFC
Hidenobu Muranaka, Tomoyuki Kato, Tomohiro Yamauchi, Hiroyuki Irie, Hiroki Ooi, Yu Tanaka, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Masashi Abe, Takeshi Umeki, Yutaka Miyamoto, Takeshi Hoshida
2024 — conf
PPLN-Based Polarization-Diverse Phase-Sensitive Amplification of 96-Gbaud PDM-PCS-64QAM Signal with Carrier-Phase-Locked Phase-Conjugated Twin Waves.
OFC
Shimpei Shimizu, Takushi Kazama, Takeshi Umeki, Koji Enbutsu, Masanori Nakamura, Masashi Abe, Takayuki Kobayashi, Yutaka Miyamoto
2023 — conf
103-ch. 132-Gbaud PS-QAM Signal Inline-amplified Transmission with 14.1-THz Bandwidth Lumped PPLN-based OPAs over 400-km G.652.D SMF.
OFC
Takayuki Kobayashi, Shimpei Shimizu, Masanori Nakamura, Takushi Kazama, Masashi Abe, Takeshi Umeki, Akira Kawai, Fukutaro Hamaoka, Munehiko Nagatani, Hiroshi Yamazaki, Yutaka Miyamoto
2023 — conf
38.4-Tbps Inline-amplified Transmission Using PPLN-based Optical Parametric Amplifier over 6 THz within L- and U-bands.
OFC
Shimpei Shimizu, Takayuki Kobayashi, Akira Kawai, Takushi Kazama, Masanori Nakamura, Koji Enbutsu, Takahiro Kashiwazaki, Masashi Abe, Takeshi Umeki, Yutaka Miyamoto, Tomoyuki Kato, Yu Tanaka, Takeshi Hoshida
2023 — conf
Experimental Demonstration of Cascadable PPLN-Based Inter-Band Wavelength Converters for Band-Switchable Multi-Band Optical Cross-Connect.
OFC
Haruka Minami, Kenta Hirose, Takafumi Fukatani, Masahiro Nakagawa, Takeshi Seki, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Koji Enbutsu, Kei Watanabe, Takeshi Umeki, Takashi Miyamura, Takeshi Kuwahara
2023 — conf
Noise Performance Improvements of 2-Layer Transistor Pixel Stacked CMOS Image Sensor with Non-doped Pixel-FinFETs.
VLSI Technology and Circuits
Yoshiaki Kikuchi, Masaki Tomita, T. Hayashi, Hiroshi Chiba, Tomoharu Ogita, Tatsuya Okawa, Keiji Nishida, Masataka Sugimoto, Daisuke Yoneyama, Takeshi Umeki, Hiroshi Oishi, Shinichi Miyake, Katsunori Hiramatsu, Hiroshi Kumano, Hiroyuki Kawashima, Noriteru Yamada, Masahiro Tamura, Hiroshi Ohnuma, Koji Tatani
2023 J jnl
S-Band WDM Transmission Using PPLN-Based Wavelength Converters and 400-Gb/s C-Band Real-Time Transceivers.
IEICE Trans. Commun.
Tomoyuki Kato, Hidenobu Muranaka, Yu Tanaka, Yuichi Akiyama, Takeshi Hoshida, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Kei Watanabe, Yutaka Miyamoto
2022 — conf
50-Tb/s (1 Tb/s × 50 ch) WDM Transmission on Two 6.25-THz Bands Using Hybrid Inline Repeater of PPLN-based OPAs and Incoherent-forward-pumped DRA.
OFC
Takayuki Kobayashi, Shimpei Shimizu, Masanori Nakamura, Takeshi Umeki, Takushi Kazama, Junji Yoshida, Shigehiro Takasaka, Yasuto Tatamida, Hiroto Kawakami, Fukutaro Hamaoka, Munehiko Nagatani, Hiroshi Yamazaki, Kei Watanabe, Takashi Saida, Yutaka Miyamoto
2022 J jnl
Channel Arrangement Design in Lumped Amplified WDM Transmission over NZ-DSF Link with Nonlinearity Mitigation Using Optical Phase Conjugation.
IEICE Trans. Commun.
Shimpei Shimizu, Takayuki Kobayashi, Takeshi Umeki, Takushi Kazama, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2022 — conf
Generation of Carrier-Synchronized PDM Signal-Idler Pair for Polarization-Independent Phase-Sensitive Amplification.
OECC/PSC
Shimpei Shimizu, Takushi Kazama, Takeshi Umeki, Takayuki Kobayashi, Koji Enbutsu, Kei Watanabe, Yutaka Miyamoto
2022 — conf
Mitigation of Intercore Crosstalk Impact with PPLN-based Optical Spectrum Inversion.
OECC/PSC
Megumi Hoshi, Kohki Shibahara, Shimpei Shimizu, Takayuki Kobayashi, Takeshi Umeki, Takushi Kazama, Kei Watanabe, Takayoshi Mori, Yusuke Yamada, Kazuhide Nakajima, Yutaka Miyamoto
2022 — conf
WDM Transmission in S-Band Using PPLN-Based Wavelength Converters and 400-Gb/s C-Band Real-Time Transceivers.
OECC/PSC
Tomoyuki Kato, Hidenobu Muranaka, Yu Tanaka, Yuichi Akiyama, Takeshi Hoshida, Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Kei Watanabe, Yutaka Miyamoto
2021 — conf
13.4-Tb/s WDM Transmission over 1, 280 km Repeated only with PPLN-based Optical Parametric Inline Amplifier.
ECOC
Takayuki Kobayashi, Shimpei Shimizu, Masanori Nakamura, Takushi Kazama, Takeshi Umeki, Ryoichi Kasahara, Fukutaro Hamaoka, Yutaka Miyamoto
2021 — conf
8-Tbps (20 × 400 Gbps) Unrepeated Transmission over 80 km with 2-THz PPLN-Based Phase-Sensitive Amplification Using Precise Chromatic Dispersion Pre-Compensation.
ECOC
Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Takeshi Umeki, Masanori Nakamura, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2021 — conf
Wideband PPLN-based optical parametric amplifiers for scalable optical transport network.
OFC
Yutaka Miyamoto, Takayuki Kobayashi, Takeshi Umeki, Takushi Kazama, Koji Enbutsu, Shimpei Shimizu, Ryoichi Kasahara
2020 J jnl
Collective and synchronous dynamics of photonic spiking neurons.
CoRR
Takahiro Inagaki, Kensuke Inaba, Timothée G. Leleu, Toshimori Honjo, Takuya Ikuta, Koji Enbutsu, Takeshi Umeki, Ryoichi Kasahara, Kazuyuki Aihara, Hiroki Takesue
2020 — conf
Gain Ripple and Passband Narrowing Due to Residual Chromatic Dispersion in Non-Degenerate Phase-Sensitive Amplifiers.
OFC
Shimpei Shimizu, Takushi Kazama, Takayuki Kobayashi, Takeshi Umeki, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2020 J jnl
Nonlinearity Mitigation of PDM-16QAM Signals Using Multiple CSI-OPCs in Ultra-Long-Haul Transmission without Excess Penalty.
IEICE Trans. Commun.
Takeshi Umeki, Takayuki Kobayashi, Akihide Sano, Takuya Ikuta, Masashi Abe, Takushi Kazama, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2020 J jnl
PPLN-Based Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump.
IEICE Trans. Commun.
Takushi Kazama, Takeshi Umeki, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Atsushi Takada, Ryoichi Kasahara
2020 — conf
Wideband Inline-Amplified WDM Transmission using PPLN-Based OPA with Over-10-THz Bandwidth.
OFC
Takayuki Kobayashi, Shimpei Shimizu, Masahito Nakamura, Takeshi Umeki, Takushi Kazama, Ryoichi Kasahara, Fukutaro Hamaoka, Munehiko Nagatani, Hiroshi Yamazaki, Takayuki Mizuno, Hideyuki Nosaka, Yutaka Miyamoto
2019 — conf
1.4μm-1.6μm Wavelength Conversion Using Multiple Quasi-Phase Matching LiNbO3.
OECC/PSC
Saroeun Punhavan, Masato Kato, Keisuke Sugiyama, Masaki Asobe, Takeshi Umeki, Koji Enbutsu, Takushi Kazama, Takahiro Kashiwazaki, Ryoichi Kasahara
2019 — conf
35-Tb/s C-Band Transmission Over 800 km Employing 1-Tb/s PS-64QAM Signals Enhanced by Complex 8 × 2 MIMO Equalizer.
OFC
Takayuki Kobayashi, Masanori Nakamura, Fukutaro Hamaoka, Munehiko Nagatani, Hitoshi Wakita, Hiroshi Yamazaki, Takeshi Umeki, Hideyuki Nosaka, Yutaka Miyamoto
2019 — conf
Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump.
OECC/PSC
Takushi Kazama, Takeshi Umeki, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Atsushi Takada, Ryoichi Kasahara
2019 — conf
Nonlinearity mitigation of PDM-16QAM signal using multiple CSI-OPCs in ultra-long haul transmission without excess penalty.
OECC/PSC
Takeshi Umeki, Takayuki Kobayashi, Akihide Sano, Takuya Ikuta, Masashi Abe, Takushi Kazama, Koji Enbutsu, Ryoichi Kasahara, Yutaka Miyamoto
2018 — conf
96-Gbaud PDM-8QAM Single Channel Transmission over 9, 600 km by Nonlinear Tolerance Enhancement using PPLN-based Optical Phase Conjugation.
OFC
Takayuki Kobayashi, Takeshi Umeki, Ryoichi Kasahara, Hiroshi Yamazaki, Munehiko Nagatani, Hitoshi Wakita, Hirokazu Takenouchi, Yutaka Miyamoto
2018 J jnl
Phase Sensitive Amplifier Using Periodically Poled LiNbO
IEICE Trans. Electron.
Masaki Asobe, Takeshi Umeki, Osamu Tadanaga
2018 — conf
Polarization-diversity In-line Phase Sensitive Amplifier for Simultaneous Amplification of Fiber-transmitted WDM PDM-16QAM Signals.
OFC
Takeshi Umeki, Takushi Kazama, Takayuki Kobayashi, Shigehiro Takasaka, Yasuhiro Okamura, Koji Enbutsu, Osamu Tadanaga, Hirokazu Takenouchi, Ryuichi Sugizaki, Atsushi Takada, Ryoichi Kasahara, Yutaka Miyamoto
2018 J jnl
Scaling advantages of all-to-all connectivity in physical annealers: the Coherent Ising Machine vs. D-Wave 2000Q.
CoRR
Ryan Hamerly, Takahiro Inagaki, Peter L. McMahon, Davide Venturelli, Alireza Marandi, Tatsuhiro Onodera, Edwin Ng, Carsten Langrock, Kensuke Inaba, Toshimori Honjo, Koji Enbutsu, Takeshi Umeki, Ryoichi Kasahara, Shoko Utsunomiya, Satoshi Kako, Ken-ichi Kawarabayashi, Robert L. Byer, Martin M. Fejer, Hideo Mabuchi, Eleanor Gilbert Rieffel, Hiroki Takesue, Yoshihisa Yamamoto
2018 — conf
Towards Practical Implementation of Optical Parametric Amplifiers Based on PPLN Waveguides.
OFC
Takeshi Umeki, Takushi Kazama, Takayuki Kobayashi, Koji Enbutsu, Osamu Tadanaga, Hirokazu Takenouchi, Ryoichi Kasahara, Yutaka Miyamoto
2016 — conf
Low-noise phase-sensitive amplifier for guard-band-less 16-channel DWDM signal using PPLN waveguides.
OFC
Takushi Kazama, Takeshi Umeki, Masashi Abe, Koji Enbutsu, Yutaka Miyamoto, Hirokazu Takenouchi
2016 J jnl
PPLN-Based Low-Noise In-Line Phase Sensitive Amplifier with Highly Sensitive Carrier-Recovery System.
IEICE Trans. Commun.
Koji Enbutsu, Takeshi Umeki, Osamu Tadanaga, Masaki Asobe, Hirokazu Takenouchi
2015 C conf
PPLN-based low-noise in-line phase sensitive amplifier with highly sensitive carrier-recovery system.
APCC
Koji Enbutsu, Takeshi Umeki, Osamu Tadanaga, Hirokazu Takenouchi, Masaki Asobe
2015 — conf
Spectrally efficient optical phase conjugation based on complementary spectral inversion for nonlinearity mitigation.
ECOC
Takeshi Umeki, Takushi Kazama, H. Ono, Yutaka Miyamoto, Hirokazu Takenouchi
2014 — conf
First demonstration of PDM signal amplification using PPLN-based polarization-independent phase sensitive amplifier.
ECOC
Takeshi Umeki, Takushi Kazama, Osamu Tadanaga, Koji Enbutsu, Masaki Asobe, Yutaka Miyamoto, Hirokazu Takenouchi
2014 — conf
Low noise and regenerative phase sensitive amplifier based on PPLN waveguides.
OFC
Takeshi Umeki, Masaki Asobe, H. Takara, Osamu Tadanaga, Koji Enbutsu, Yutaka Miyamoto, Hirokazu Takenouchi
2013 — conf
First demonstration of multi-span transmission using phase and amplitude regeneration in PPLN-based PSA.
OFC/NFOEC
Takeshi Umeki, Masaki Asobe, H. Takara, Takayuki Kobayashi, Hirokazu Kubota, Hirokazu Takenouchi, Yutaka Miyamoto
2013 — conf
PPLN based phase sensitive amplifiers and their applications.
OFC/NFOEC
Masaki Asobe, Takeshi Umeki, Hirokazu Takenouchi