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Koji Enbutsu

ntt inc

18H-index
147Paper Count
2.0KCitation Count
Published Papers 35
Publication Date
ISRS-Supported Ultra-Wideband Transmission in S, C, L, U, and Extremely Long Wavelength Bands With PPLN-Based OPA/EDFA Hybrid Repeater
err2025-09-12
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errShimpei 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
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Band-Switchable Multi-Band Optical Cross-Connect Using PPLN-Based All-Optical Inter-Band Wavelength Converters
err2025-02-15
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errMinami, Haruka; Fukatani, Takafumi; Nakagawa, Masahiro; Seki, Takeshi; Shimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Enbutsu, Koji; Umeki, Takeshi; Hayashi, Rie; Kuwahara, Takeshi
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Optically enhanced pump-phase noise in mid-link optical parametric phase conjugation
err2024-10-29
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errShimizu, Shimpei; Nakamura, Masanori; Kawai, Akira; Kazama, Takushi; Abe, Masashi; Enbutsu, Koji; Umeki, Takeshi; Kobayashi, Takayuki; Miyamoto, Yutaka
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Hybrid Lumped Repeater Using PPLN-Based High-Gain Optical Parametric Phase Conjugators and EDFAs for C plus L-Band Transmission
err2024-05-15
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errShimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Nakamura, Masanori; Enbutsu, Koji; Kashiwazaki, Takahiro; Abe, Masashi; Umeki, Takeshi; Miyamoto, Yutaka
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Impact of pump-phase noise in PPLN-based optical parametric amplifier and wavelength converter for digital coherent transmission
err2024-05-02
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errShimizu, Shimpei; Kawai, Akira; Kobayashi, Takayuki; Nakamura, Masanori; Kazama, Takushi; Abe, Masashi; Enbutsu, Koji; Umeki, Takeshi; Miyamoto, Yutaka
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L- and U-Band WDM Transmission Over 6 THz Using PPLN-Based Optical Parametric Amplification and Wavelength-Band Conversion
err2024-03-01
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errShimizu, Shimpei; Kobayashi, Takayuki; Kawai, Akira; Kazama, Takushi; Nakamura, Masanori; Enbutsu, Koji; Kashiwazaki, Takahiro; Abe, Masashi; Umeki, Takeshi; Miyamoto, Yutaka; Kato, Tomoyuki; Tanaka, Yu; Hoshida, Takeshi
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Transmission of signal and idler using optical parametric amplifier based on PPLN waveguide
err2024-02-22
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errOAAI
errAsobe, Masaki; Wanifeni, Ndadi; Kazama, Takushi; Enbutsu, Koji; Umeki, Takeshi
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Low-Penalty Band-Switchable Multi-Band Optical Cross-Connect Using PPLN-Based Inter-Band Wavelength Converters
err2024-02-15
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errMinami, Haruka; Hirose, Kenta; Fukatani, Takafumi; Nakagawa, Masahiro; Seki, Takeshi; Shimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Enbutsu, Koji; Umeki, Takeshi; Kuwahara, Takeshi
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Wideband Optical Parametric Amplification of 8.375-THz WDM Signal Using Cascaded PPLN Waveguides With Reused Pump Light
err2023-12-15
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errShimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Umeki, Takeshi; Nakamura, Masanori; Enbutsu, Koji; Kashiwazaki, Takahiro; Hamaoka, Fukutaro; Nagatani, Munehiko; Yamazaki, Hiroshi; Watanabe, Kei; Miyamoto, Yutaka
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Effect of Gain Saturation on Wideband WDM Signal in PPLN-Based Optical Parametric Amplifier
err2023-08-01
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errShimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Nakamura, Masanori; Kawai, Akira; Enbutsu, Koji; Umeki, Takeshi; Miyamoto, Yutaka
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Over-8-dB squeezed light generation by a broadband waveguide optical parametric amplifier toward fault-tolerant ultra-fast quantum computers
err2023-06-06
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errKashiwazaki, Takahiro; Yamashima, Taichi; Enbutsu, Koji; Kazama, Takushi; Inoue, Asuka; Fukui, Kosuke; Endo, Mamoru; Umeki, Takeshi; Furusawa, Akira
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Experimental observation of chimera states in spiking neural networks based on degenerate optical parametric oscillators
err2023-05-27
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errMakinwa, Tumi; Inaba, Kensuke; Inagaki, Takahiro; Yamada, Yasuhiro; Leleu, Timothee; Honjo, Toshimori; Ikuta, Takuya; Enbutsu, Koji; Umeki, Takeshi; Kasahara, Ryoichi; Aihara, Kazuyuki; Takesue, Hiroki
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Toward a multi-core ultra-fast optical quantum processor: 43-GHz bandwidth real-time amplitude measurement of 5-dB squeezed light using modularized optical parametric amplifier with 5G technology
err2023-03-06
err24
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errInoue, A.; Kashiwazaki, T.; Yamashima, T.; Takanashi, N.; Kazama, T.; Enbutsu, K.; Watanabe, K.; Umeki, T.; Endo, M.; Furusawa, A.
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Observing a Phase Transition in a Coherent Ising Machine
err2023-03-01
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errTakesue, Hiroki; Yamada, Yasuhiro; Inaba, Kensuke; Ikuta, Takuya; Yonezu, Yuya; Inagaki, Takahiro; Honjo, Toshimori; Kazama, Takushi; Enbutsu, Koji; Umeki, Takeshi; Kasahara, Ryoichi
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Quantum arbitrary waveform generator
err2022-10-28
err8
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errTakase, Kan; Kawasaki, Akito; Jeong, Byung Kyu; Kashiwazaki, Takahiro; Kazama, Takushi; Enbutsu, Koji; Watanabe, Kei; Umeki, Takeshi; Miki, Shigehito; Terai, Hirotaka; Yabuno, Masahiro; China, Fumihiro; Asavanant, Warit; Endo, Mamoru; Yoshikawa, Jun-Ichi; Furusawa, Akira
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Wideband PPLN-Based Phase-Sensitively Amplified Transmission of 20-Channel 96-Gbaud WDM Signal
err2022-08-15
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errShimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Umeki, Takeshi; Nakamura, Masanori; Enbutsu, Koji; Kasahara, Ryoichi; Miyamoto, Yutaka
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PPLN-Based Optical Parametric Amplification for Wideband WDM Transmission
err2022-06-01
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errShimizu, Shimpei; Kobayashi, Takayuki; Kazama, Takushi; Umeki, Takeshi; Nakamura, Masanori; Enbutsu, Koji; Kashiwazaki, Takahiro; Kasahara, Ryoichi; Watanabe, Kei; Miyamoto, Yutaka
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Potts model solver based on hybrid physical and digital architecture
err2022-05-31
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errInaba, Kensuke; Inagaki, Takahiro; Igarashi, Koji; Utsunomiya, Shoko; Honjo, Toshimori; Ikuta, Takuya; Enbutsu, Koji; Umeki, Takeshi; Kasahara, Ryoichi; Inoue, Kyo; Yamamoto, Yoshihisa; Takesue, Hiroki
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Generation of Schrodinger cat states with Wigner negativity using a continuous-wave low-loss waveguide optical parametric amplifier
err2022-04-12
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errTakase, Kan; Kawasaki, Akito; Jeong, Byung Kyu; Endo, Mamoru; Kashiwazaki, Takahiro; Kazama, Takushi; Enbutsu, Koji; Watanabe, Kei; Umeki, Takeshi; Miki, Shigehito; Terai, Hirotaka; Yabuno, Masahiro; China, Fumihiro; Asavanant, Warit; Yoshikawa, Jun-ichi; Furusawa, Akira
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Broadband optical parametric amplification using PPLN waveguide pumped by detuned second harmonic
err2022-03-08
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errAsobe, Masaki; Yagi, Daiki; Kawabata, Yuki; Umeki, Takeshi; Enbutsu, Koji; Kazama, Takushi; Kasahara, Ryoichi
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