Výsledky vyhledávání - "Hisao NAKASHIMA"

1.96Tbps and 256-Gbaud Dual-carrier Faster than Nyquist Signal Transmission Using Two Narrow-bandwidth Modulators and Single Coherent Receiver

Autor: Guoxiu Huang, Hisao Nakashima, Jun Matsui, Yohei Sobu, Shinsuke Tanaka, Takeshi Hoshida

Publikováno v: 2023 Optical Fiber Communications Conference and Exhibition (OFC).

A large capacity system basing on Faster-than-Nyquist technologies using narrow-bandwidth components was experimentally demonstrated with a hybrid of simple transmitter DSP and optical-equalization for an efficient spectrum-shaping to achieve 1.96Tbp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8213c91e76cee835e978ec5aa929d734
https://doi.org/10.23919/ofc49934.2023.10116361

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Characterization, Measurement and Specification of Device Imperfections in Optical Coherent Transceivers

Autor: Zhenning Tao, Yangyang Fan, Xiaofei Su, Ke Zhang, Chengwu Yang, Tong Ye, Jingnan Li, Hisao Nakashima, Takeshi Hoshida

Publikováno v: Journal of Lightwave Technology. 40:3163-3172

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::62a733afe883eb75a5f8968e8580d7a9
https://doi.org/10.1109/jlt.2022.3155454

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Calibration of High-Speed Time-Interleaving DAC

Autor: Ke Zhang, Xiaofei Su, Hisao Nakashima, Takeshi Hoshida, Zhenning Tao

Publikováno v: Optical Fiber Communication Conference (OFC) 2023.

Distortion in high-speed time-interleaving DAC caused by the mismatch among sub- DACs is experimentally calibrated by the enhanced error backpropagation scheme. Undesired spur is reduced by 20 dB, and the ENOB is improved by 0.72 bit.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47981e190c1ea0c34b54367597d97c80
https://doi.org/10.1364/ofc.2023.w1e.4

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Nonlinear noise spectrum measurement using a probability-maintained noise power ratio method

Autor: Tong Ye, Xiaofei Su, Ke Zhang, Chengwu Yang, Jingnan Li, Yangyang Fan, Hisao Nakashima, Takeshi Hoshida, Zhenning Tao

Publikováno v: Communications Engineering. 1

Nonlinear distortion (noise) limits many communication systems, demanding a means of estimating system performance via device nonlinear characteristics. The noise power ratio (NPR) method which was proposed in 1971 solves this problem for systems wit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4e8dbd99eb470f366a8fa2aa1e80a9ab
https://doi.org/10.1038/s44172-022-00047-y

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Transceiver Imbalances Compensation and Monitoring by Receiver DSP

Autor: Yangyang Fan, Zhenning Tao, Hisao Nakashima, Junpeng Liang, Xiaofei Su

Publikováno v: Journal of Lightwave Technology. 39:5397-5404

In-phase and quadrature (IQ) imbalances in optical transceiver, such as amplitude imbalance, phase imbalance, and IQ skew, can cause serious system performance degradation, especially when high order modulation formats are used. In this work, we pres

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68df4df8abab35173e30a9ece97dc5af
https://doi.org/10.1109/jlt.2019.2944830

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A Sensitive Method for Estimating the Linear Length of a System

Autor: Chengwu Yang, Tong Ye, Ke Zhang, Zhenning Tao, Hisao Nakashima, Takeshi Hoshida

Publikováno v: 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC).

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b4323f6bf73e89144a366ef010c7e71
https://doi.org/10.23919/oecc/psc53152.2022.9849880

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Nonlinear Distortion Identification for Coherent Optical Communication

Autor: Ke Zhang, Zhenning Tao, ChengWu Yang, Hisao Nakashima, Takeshi Hoshida

Publikováno v: 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC).

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::754bd55b7c21334ef2de70e41d3fe125
https://doi.org/10.23919/oecc/psc53152.2022.9850162

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Faster than Nyquist PDM-16QAM Modulation with Low Resolution and Low Speed DAC

Autor: Guoxiu Huang, Hisao Nakashima, Takeshi Hoshida

Publikováno v: 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC).

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f9081bf4a19cb23d02709946c9796fbe
https://doi.org/10.23919/oecc/psc53152.2022.9849941

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Performance Evaluation of WDM Channel Transmission for Probabilistic Shaping With Partial Multilevel Coding

Autor: Kiichi Sugitani, Yohei Koganei, Hisao Nakashima, Hiroyuki Irie

Publikováno v: Journal of Lightwave Technology. 39:2873-2879

We propose partial multilevel coding (MLC) for optical communications with probabilistic shaping (PS), which improves the signal-to-noise ratio performance and makes information rates more adaptable, while reducing the power consumed by forward error

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::16f037a7ef7c236386da7f890afb7d4d
https://doi.org/10.1109/jlt.2021.3061177

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