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Deep belief network-hidden Markov model based nonlinear equalizer for VCSEL based optical interconnect

Science China(Information Sciences) 2020年第6期63卷 155-163页

作者： Fukui TIAN Chuanchuan YANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

The data center has developed rapidly over the past few years, leading to the demand for high speed data transmission. Vertical cavity surface emitting lasers(VCSELs) based optical interconnect is evolving to 100 Gb/s and beyond, which makes nonlinear distortions difficult to be compensated or equalized by conventional equalizers. Moreover, the challenge becomes very complicated for conventional equalizers because of the presence of inter-symbol interference(ISI) together with the nonlinear distortions. So many neural network based DSP algorithms such as artificial neural network(ANN) have been proposed to mitigate the distortions. However, ANN has the limitations that sample's relevant information is not considered,leading to degradation in ANN's performance and high computational complexity. In this paper, in order to maintain an excellent capability of mitigating nonlinear distortions like other neural network based equalizers while considering the sample's relevant information to reduce the computational complexity, we propose a deep belief network-hidden Markov model(DBN-HMM) based nonlinear equalizer which is tested in a PAM-4 modulated VCSEL and multimode fiber(MMF) optical interconnect link experimentally. The BER performance can be greatly improved compared with conventional DSP algorithms. In addition, the computational complexity of DBN-HMM based equalizer can be about 41% lower than that of ANN based method with a similar BER performance.

关键词： short-range optical interconnect vertical cavity surface emitting laser(VCSEL) nonlinear equalizer deep belief network(DBN) hidden Markov model(HMM)

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Dual-Polarization Direct Detection with Jones Space Field Recovery

Dual-Polarization Direct Detection with Jones Space Field Re...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Qi Wu Yixiao Zhu Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

optical field recovery not only increases the optical modulation dimensions but also enables digital compensation for fiber impairments such as chromatic dispersion. In this paper, we propose the first optical full-field recovery receiver in Jones space to achieve polarization and phase diversity for the direct detection system. 448 Gb/s dual-polarization 16QAM signal is successfully recovered after 80-km SMF transmission with 7.15-b/s/Hz net electrical spectral efficiency.

关键词： optical fibers optical fiber polarization Multiplexing optical polarization Spectral efficiency optical receivers optical fiber communication

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Piecewise Linear and Nonlinearity-aware Complex-valued Decision Feedback Equalization for DML-DD Link at C Band

Piecewise Linear and Nonlinearity-aware Complex-valued Decis...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yikun Zhang Yixiao Zhu Qi Wu Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Directly modulated laser with direct detection (DML-DD) is a low-cost solution for short-reach transmission, but it suffers from severe nonlinear impairment coupled by laser chirp and fiber dispersion. In this work, we propose a piecewise linear (PWL) with nonlinearity-aware complex-valued decision feedback equalizer (CDFE) scheme to compensate for the impairments in dispersion-unmanaged C-band short-reach link. By mapping neighboring symbol pair into 2-dimensional constellation, error propagation is suppressed by K-means and subsequently assist feedback equalization. The proposed PWL-CDFE exhibits 0.5dB receiver sensitivity improvement, compared with the joint PWL, feed forward equalizer (FFE) and decision feedback equalizer (DFE). With the help of proposed PWL-CDFE, 72 Gb/s 4-ary pulse amplitude modulation (PAM-4) signal is experimentally transmitted over 40km standard single-mode fiber (SSMF), with a BER below the 14% hard detection forward error correction (HD-FEC) threshold.

关键词： Chirp C-band Symbols Laser feedback Amplitude modulation Decision feedback equalizers optical fiber communication

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Carrier-Assisted Phase Retrieval with Multiple Projections

Carrier-Assisted Phase Retrieval with Multiple Projections

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Qi Wu Yixiao Zhu Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Phase-retrieval (PR) schemes based on the modified Gerchberg-Saxton (GS) algorithm capture the full-field employing dispersive elements and intensity-only measurements to eliminate the use of local oscillator in direct detection systems. Assisted with a weak digital virtual carrier, the comprehensive performance of PR is significantly improved in terms of convergence speed, computational complexity, and frame redundancy. In this work, we experimentally demonstrate the edge carrier-assisted PR (ECA-PR) scheme with multiple projections. 56 GBd 16-ary quadrature-amplitude-modulation (16-QAM) signal is successfully transmitted over 80-km single-mode fiber (SMF) with the bit-error-rate (BER) below 7% overhead hard- decision forward error correction (HD-FEC) threshold. The required carrier-to-signal power ratio (CSPR) and number of iterations for carrier-assisted PR are significantly reduced to -3 dB and 5 compared with previous demonstrations, respectively.

关键词： optical fibers Local oscillators Phase measurement Phase modulation Termination of employment optical fiber networks Wavelength division multiplexing

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Deep Neural Network Enhanced Chip-on-board Hybrid-Packaged Photonic-Electrical Silicon Transceiver for High-speed optical Interconnects

Deep Neural Network Enhanced Chip-on-board Hybrid-Packaged P...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Qin, Jun Yang, Qipeng Han, Changhao Zhou, Yan Zhang, Yunhao Wu, Yichen Sun, Yu Lu, Junde Liu, Siming Li, Yueqin Sun, Jian Min, Miao Hu, Weiwei He, Zhixue Wang, Lei Yu, Shaohua Shu, Haowen Wang, Xingjun Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University Beijing100192 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States Peking University Yangtze Delta Institute of Optoelectronics Nantong226010 China Peng Cheng Laboratory Shenzhen518055 China State Key Laboratory of Information Photonics and Optical Communications BUPT Beijing100876 China

We explore implementing a multilevel deep neural network to enhance the performance of a 4-channel photonic-electrical hybrid-packaged silicon transceiver. Stable transmission and reception of 150 Gbps/λ PAM4 signals... 详细信息

ISBN: (纸本)9781957171395

关键词： optical interconnects

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Reliable intracavity reflection for self-injection locking lasers and microcomb generation

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Photonics Research 2024年第S1期12卷 I0001-I0010页

作者： BITAO SHEN XUGUANG ZHANG YIMENG WANG ZIHAN TAO HAOWEN SHU HUAJIN CHANG WENCAN LI YAN ZHOU Zhangfeng Ge RUIXUAN CHEN BOWEN BAI LIN CHANG XINGJUN WANG State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518055China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China

Self-injection locking has emerged as a crucial technique for coherent optical sources,spanning from narrow linewidth lasers to the generation of localized *** technique involves key components,namely a laser diode and a high-quality cavity that induces narrow-band reflection back into the laser ***,in prior studies,the reflection mainly relied on the random intracavity Rayleigh backscattering,rendering it unpredictable and unsuitable for large-scale production and wide-band *** this work,we present a simple approach to achieve reliable intracavity reflection for self-injection locking to address this challenge by introducing a Sagnac loop into the *** method guarantees robust reflection for every resonance within a wide operational band without compromising the quality factor or adding complexity to the fabrication *** a proof of concept,we showcase the robust generation of narrow linewidth lasers and localized microcombs locked to different resonances within a normal-dispersion ***,the existence and generation of localized patterns in a normal-dispersion cavity with broadband forward–backward field coupling is first proved,as far as we know,both in simulation and in *** research offers a transformative approach to self-injection locking and holds great potential for large-scale production.

关键词： intracavity injection locking

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Generalized Carrier Assisted Differential Detection Receiver with Simplest Structure

Generalized Carrier Assisted Differential Detection Receiver...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Yixiao Zhu Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We propose a generalized carrier assisted differential detection receiver featuring simplest structure of 2 × 2 optical coupler and 2 single-ended photodiodes. The performance of the designed receiver is comprehe...

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783-MHz fundamental repetition rate CNT mode-locked all Er-doped fiber ring laser

783-MHz fundamental repetition rate CNT mode-locked all Er-d...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Dai, Maolin Liu, Bowen Ma, Yifan Shirahata, Takuma Yang, Ruoao Zhang, Zhigang Set, Sze Yun Yamashita, Shinji Department of Electrical Engineering and Information Systems The University of Tokyo Bunkyo-ku Tokyo113-8656 Japan Research Center for Advanced Science and Technology The University of Tokyo Meguro-ku Tokyo153-8904 Japan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

We realize 783-MHz fundamental repetition rate in a carbon-nanotubes (CNT) modelocked Er-doped fiber ring laser with all active fibers. The proposed laser self-starts mode-locking at 108-mW pump power and delivers 623... 详细信息

关键词： Ring lasers

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Low phase noise X-band frequency synthesizer based on a phase-locked brillouin optoelectronic oscillator 26

Low phase noise X-band frequency synthesizer based on a phas...

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26th Optoelectronics and communications Conference, OECC 2021

作者： Peng, Huanfa Lei, Peng Xie, Xiaopeng Chen, Zhangyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing China

An X-band frequency synthesizer utilizing a phase-locked optoelectronic oscillator based on the deamplification of stimulated Brillouin scattering is experimentally demonstrated. Phase noise of -125dBc/Hz at 10kHz off... 详细信息

ISBN: (纸本)9781557528209

关键词： Frequency synthesizers

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High spectral purity millimeter-wave generated from millihertz-linewidth lasers

High spectral purity millimeter-wave generated from milliher...

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2024 Asia communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical communications, IPOC 2024

作者： Yang, Zhengyuxiao Ke, Haocheng Xiao, Yanlan Li, Houchen Li, Mo Zhang, Jian Xu, Jing Yang, Fan Wen, Huashun Zhou, Heng Key Laboratory of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of China Chengdu611731 China Institute of Advanced Millimeter-Wave Technology University of Electronic Science and Technology of China Chengdu611731 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory on Integrated Optoelectronics Chinese Academy of Sciences Beijing100083 China

ISBN: (纸本)9798350379266

关键词： Linewidth

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