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Performance of High Speed coherent Optical communication Systems

The Journal of China Universities of Posts and Telecommunications 1998年第1期5卷 69-70页

作者： HuangShouhua ZhaoZisen DepartmentofRadioEngineering BeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.Chna Dep

Performance of high speed coherent optical communication systems has been investigated. A novel frequency tracking/locking automatical fre quency control (clock frequency tracking AFC, CFT AFC) scheme has been presented. The first Gb/s speed coherent optical communication system of China (1.1 Gb/s FSK optical communication system) has been achieved. The achievements of this paper are as follows: (1) Performance of coherent optical communication system has been investigated. A set of expressions are deduced. In the expressions, the effects of the LD line width, waveform of modulation signal, the signal phase jitter, intersymbol interference (ISI) and various kinds of noises are comprehensively included for the first time. (2) The jitter performance of coherent optical communication system is analyzed for the first time. The timing jitter theory of coherent optical communication system is achieved. (3) A novel frequency tracking/locking automatic frequency control (clock frequency tracking AFC, CFT AFC) scheme is presented. The scheme has three advantages compared with other AFC schemes: (a) frequency tracking/locking may be achieved efficiently; (b) timing clock may be extracted efficiently; and (c) the circuitry is simpler and steadier. (4) Performance of phase diversity (PD) optical communication systems is analyzed. The BER expressions of PD systems modulated under various kinds of signal waveforms are presented. The power penalties of PD systems resulted from signal phase jitter and ISI are deduced. (5) Performance of the light sources of coherent optical communication (external cavity LD and DFB LD) is analyzed. The non flat FM (frequency modulation) response of LD chip is compensated by external circuitry. The DFB LD module with 4.7 GHz FM response is achieved. (6) Compensation of fiber dispersion in optical communication is investigated. The practical fiber dispersion compensators are achieved. (7) The first Gb/s s

关键词： coherent communication semiconductor laser optical trans. system

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Multi-carrier Tb/s silicon photonic coherent receiver

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Science China(Information Sciences) 2024年第1期67卷 284-291页

作者： Zhen WANG Xingfeng LI Jingchi LI Jian SHEN Yong ZHANG Yikai SU State Key Lab of Advanced Optical communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

We propose a silicon polarization-diversity coherent receiver for wavelength-multiplexing transmission without using the large-footprint arrayed waveguide grating(AWG).We have integrated our proposed coherent receiver on the silicon-on-insulator(SOI) platform for high-capacity *** the proposed coherent receiver,high-frequency photocurrent signals from other wavelengths are suppressed by electrical low-pass ***,the signal-signal beat interference(SSBI) generated from each wavelength is eliminated by the balanced *** two features lend to the proposed coherent receiver being free of the mm-scale *** have demonstrated our proposed coherent receiver to detect a 1.12-Tb/s wavelength-division-multiplexed and polarization-division-multiplexed 16-ary quadrature amplitude modulation(PDM-16-QAM) *** compact footprint of the silicon chip promises small-form-factor receivers for future ultra-high-capacity coherent communication systems that require a high integration level and low fabrication cost.

关键词： silicon photonics optical receivers coherent communication wavelength-division-multiplexing(WDM) polarization-division-multiplexing(PDM)

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Joint modulation format identification and OSNR monitoring based on Stokes vector distribution features for digital coherent optical receivers

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Chinese Optics Letters 2024年第5期22卷 22-28页

作者：蒲正宇蒋林闫连山易安林何海军潘炜罗斌 Center for Information Photonics&communications School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 611756China

For joint modulation format identification(MFI)and optical signal-to-noise ratio(OSNR)monitoring,a simple and intelligent optical communication performance monitoring method is proposed,and the feasibility is demonstrated by digital coherent optical communication *** experiment results show that for all modulation formats,including 28 GBaud polarization division multiplexing(PDM)QPSK/8-QAM/16-QAM/64-QAM,100%MFI accuracies are achieved even at OSNR values lower than the corresponding theoretical 20%forward error correction limit,as well as the high accuracies for OSNR ***,the proposed scheme has a reasonable monitoring level when chromatic dispersion and fiber nonlinear effects are varied.

关键词： coherent communication optical performance monitoring deep neural network

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In-band OSNR monitoring based on low-bandwidth coherent receiver and tunable laser

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Frontiers of Optoelectronics 2016年第3期9卷 526-530页

作者： Yingqin PENG Yuli CHEN Qi SUI Dawei WANG Dongyu GENG Freddy FU Zhaohui LI Institute of Photonics Technology Jinan University Guangzhou 510632 China Huawei Technologies Co. Ltd Shenzhen 518129 China

An in-band optical signal-to-noise ratio （OSNR） monitoring technique with high resolution and large measurement range is demonstrated based on low- bandwidth coherent receiver and a tunable laser. The measurement ra... 详细信息

关键词： optical performance monitoring (OPM) optical signal-to-noise ratio (OSNR) coherent communication tunable laser

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Toward coherent O-band data center interconnects

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Frontiers of Optoelectronics 2021年第4期14卷 414-425页

作者： Pascal M.SEILER Galina GEORGIEVA Georg WINZER Anna PECZEK Karsten VOIGT Stefan LISCHKE Adel FATEMI Lars ZIMMERMANN Technische Universität Berlin Chair of SiliziumphotonikBerlin 10623Germany IHP–Leibniz-Institut für innovative Mikroelektronik Frankfurt(Oder)15236Germany Technische Universität Berlin Chair of Hochfrequenztechnik-PhotonikBerlin 10623Germany IHP Solutions GmbH Frankfurt(Oder)15236Germany

Upcoming generations of coherent intra/inter data center interconnects currently lack a clear path toward a reduction of cost and power consumption,which are the driving factors for these data *** this work,the tradeoffs associated with a transition from coherent C-band to O-band silicon photonics are addressed and *** discussion includes the fundamental components of coherent data links,namely the optical components,fiber link and *** a major component of these links,a monolithic silicon photonic BiCMOS O-band coherent receiver is evaluated for its potential performance and compared to an analogous C-band device.

关键词： coherent communication data center O-band silicon photonics

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Distributed Nonlinear Phase Noise Compensation for coherent Optical OFDM through Post Signal Processing

Distributed Nonlinear Phase Noise Compensation for Coherent ...

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第十七届全国青年通信学术年会

作者： Yiran Ma and Junjie Li Network Technology Department,China Telecom Beijing Research Institute,Beijing,China

We demonstrate a distributed nonlinearity compensation technique for 10.7 Gb/s coherent optical OFDM signals after 1000 km *** 2dB Q improvement has been observed after two-step compensation.

关键词： coherent communication Recirculation loop OFDM Nonlinearity compensation

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