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The Study on Heterodyne and Phase Diversity Coherent optical fiber communication Systems and Their Components

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The Journal of China Universities of Posts and Telecommunications 1998年第1期5卷 67-68页

作者： GuanKejian YePeida 等 DepartmentofRadioEngineering BeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.China De

The research in Coherent optical fiber communication Systems (COFCS) using long waveband semiconductor laser diodes as transmitter and local oscillator has evolved gradually from an esteric subject studied in just a few communication laboratories around the world to the field demonstration stage. This is mainly because of the possibility of receiver sensitivity improvement reaching 10～20 dB, that of frequency division multiplexing (FDM) with very fine frequency separation and the possibility of using electronic equalization network to compensate for the effect of optical pulse dispersion in the Single Mode fiber (SMF). The author of the dissertation has engaged in the study on COFCSs since 1987. Undergoing 3 years of hard work, the finished research work includes two parts: Part I is the study on heterodyne COFCSs and their key components; Part II is the study on two branch phase diversity COFCS and its components. In the first part, using the Lamb′s semi classical theory and the model of vector field, the effects of various kinds of parameters, such as cavity detuning, cavity′s Q factor and the transverse magnetic field strength, on the intramode beat frequency tuning characteristics are analyzed. On the basis of the theoretical analysis, the equipment of 1 523 nm He Ne Stabilized Transverse Zeeman Lasee (STZL) with high frequency stability and certain continuous single frequency tuning range, has been established domestically for the first time. With the development of long waveband semi conductor laser diodes fabricated domestically, the author mainly deals with the long waveband COFCSs using semiconductor laser diodes as transmitter and local oscillator. To counter the poor spectrum characteristics of the conventional double heterojunction semi conductor laser diodes, the characteristics of 1.5 um InGaAsP GRINROD External Cavity Semi conductor Lasers (ECSL) in the case of strong and weak feedback conditions, is experimentally studied. Then the GRINROD

关键词： optical fiber communication coherent system heterodyne receiver phase diversity receiver

UDWDM optical fiber communication and Its Key Technologies

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UDWDM Optical Fiber Communication and Its Key Technologies

A flexible receiver with fiber optical parametric amplifier in OCDMA-FSO communication system

第一届国际测量仪器与测试自动化学术会议

作者： Li Tingjun Wang Xinzheng Cheng jihong Jin Huiqin (Department of Electronic Information Engineering NAEI Yantai 264001 China)

＜正＞Analyzes the key technologies of ultra dense wavelength division multiplexing （UDWDM）, used for increasing stability of optical resource, narrowing bandwidth of multiplxer/demultiplxer, improving performance o... 详细信息

关键词： optical fiber communication UDWDM optical resource Multiplexer/Demultiplexer EDFA

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Optoelectronics Letters 2014年第6期10卷 406-410页

作者：夏民苑金辉桑新柱尹霄丽饶岚余重秀 State Key Laboratory of Information Photonics and optical communications Beijing University of Posts and Tele-communications School of Electronic Engineering Beijing University of Posts and Telecommunications

A new receiver is proposed, which uses the fiber optical parametric amplifier(FOPA) in optical code division multiple access(OCDMA) over free space optic(FSO) communication system. The noise tolerance as the performance index in this receiver is derived. The receiver can not only improve the noise tolerance but also change the pump data conveniently for adapting to the length variation of the coding sequence under a complex and fast-changing weather condition. The influence of different factors on the noise tolerance is analyzed, and a significant improvement of about 18.77 d B for the noise tolerance can be achieved when the pump power and the length of coding sequence are 5 W and 256, respectively.

关键词： Code division multiple access Codes (symbols) fiber amplifiers optical fiber communication

Remote I/O Unit for optical fiber Demmunication

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Semiconductor Photonics and Technology 1997年第1期3卷 67-70页

作者： LI Huiguang, HOU Peiguo(Yanshan University, Qinhuangdao 066004, CHN)

Abstract:Based on optical fiber technology, the main electric circuit of the remote I/O unit controller is studied. And the application of the system is illustrated.

关键词： Remote I/O Unit optical fiber communication Asynchronous Datacommunication

Ultra-wideband fiber-THz-fiber seamless integration communication system toward 6G: architecture, key techniques, and testbed implementation

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Science China(Information Sciences) 2023年第1期66卷 296-313页

作者： Min ZHU Jiao ZHANG Bingchang HUA Mingzheng LEI Yuancheng CAI Liang TIAN Dongming WANG Wei XU Chuan ZHANG Yongming HUANG Jianjun YU Xiaohu YOU National Mobile communications Research Laboratory Southeast University Purple Mountain Laboratories School of Information Science and Technology Fudan University Peng Cheng Laboratory

Terahertz(THz) communication is widely regarded as the key component of future 6G mobile communication systems. Through comparative analysis of some of the main existing technical routes of THz up-conversion and down-conversion in THz wireless communication systems, a novel ultra-wideband(UWB)fiber-THz-fiber seamlessly converged real-time architecture, which utilizes the commercially mature digital coherent optical module to realize ultrahigh-capacity THz real-time wireless communication, is proposed in this study.(1) The proposed architecture employs the dual-polarization photonic up-conversion technique for THz generation and hybrid optoelectronic down-conversion technique for THz reception to facilitate the seamless integration between optical fiber and THz communications.(2) Because of the limited bandwidth of optoelectronic devices, multidimensional modulation techniques are adopted for UWB THz signals to improve spectral efficiency and transmission capacity.(3) An intelligent nonlinear joint compensation technique based on the deep neural network, which can effectively improve the signal-to-noise ratio of the time-varying hybrid fiber-THz-fiber channel, is proposed. Based on the investigations of the aforementioned key techniques, we, for the first time, realize the photonics-assisted record-high 100/200 Gb E real-time THz wireless transmission at 360–430 GHz band, the capacity of which is 10–20 times higher than that of *** proposed fiber-THz-fiber architecture can realize the smooth conversion between high-speed THz and lightwave signals. Moreover, the architecture can significantly reduce the research difficulty and development cost, thereby considerably accelerating the commercialization of 6G THz technology by thoroughly reusing commercial digital coherent optical module(DCO) modules, which are compatible with the physical layer transmission protocols, such as IEEE 802.3 and ITU-T G.798. Finally, this study also introduces some potential directions of

关键词： 6G THz wireless communication optical fiber communication seamlessly converged architecture real-time communication

Blind Nonlinearity Equalization by Machine-Learning-Based Clustering for QAM-Based Quantum Noise Stream Cipher Transmission

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China communications 2022年第8期19卷 127-137页

作者： Yajie Li Shoudong Liu Yongli Zhao Chao Lei Jie Zhang State Key Laboratory of Information Photonics and optical communications Beijing University of Posts and TelecommunicationsBeijing 100876China

In quantum noise stream cipher(QNSC)systems,it is difficult to compensate fiber nonlinearity by digital signal processing(DSP)due to interactions between chromatic dispersion(CD),amplified spontaneous emission(ASE)noise from erbiumdoped fiber amplifier(EDFA)and Kerr *** equalizer(NLE)based on machine learning(ML)algorithms have been extensively ***,most NLE based on supervised ML algorithms have high training overhead and computation *** addition,the performance of these algorithms have a lot of *** paper proposes two clustering algorithms based on Fuzzylogic C-Means Clustering(FLC)to compensate the fiber nonlinearity in quadrature amplitude modulation(QAM)-based QNSC system,including FLC based on subtractive clustering(SC)and annealing evolution(AE)*** performance of FLC-SC and FLC-AE are evaluated through simulation and *** proposed algorithms can promptly obtain suitable initial centroids and choose optimal initial centroids of the clusters to achieve the global optimal initial centroids especially for high order modulation *** the simulation,different parameter configurations are considered,including fiber length,optical signal-to-noise ratio(OSNR),clipping ratio and resolution of digital to analog converter(DAC).Further-more,we measure the Q-factor of transmission signal with different launched powers,DAC resolution and laser linewidth in the optical back-to-back(BTB)experiment with 80-km single mode *** simulation and experimental results show that the proposed techniques can greatly mitigate the signal impairments.

关键词： fiber nonlinear optics machine learning optical fiber communication unsupervised learning

Capacity and Flexibility Improvement of Traffic Aggregation for Fixed 5G:Key Enabling Technologies,Challenges and Trends

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China communications 2022年第12期19卷 1-13页

作者： Jing Zhang Tianhai Chang Zhuqiang Zhong Xianqing Jin Shaohua Hu Taowei Jin Jiahao Zhou Mingyue Zhu Yi Yu Jianming Tang Liangchuan Li Kun Qiu School of communication and Information Engineering University of Electronic Science and Technology of ChinaChengduSichuan 611731China optical Research Dept Huawei Technologies518129ShenzhenChina School of Electronic Engineering Bangor UniversityBangorLL571UTUK

As the emergence of various highbandwidth services and the requirements to support 5G/Wi-Fi 6 wireless networks,the next generation fixed networks,i.e.F5G,are expected to be realized in the 5G era.F5G is endowed with new characteristics,including ultra-high bandwidth,all-optical connections and optimal service *** the prospect of optical-to-everywhere,optical technologies are used for mobile front-haul,mid-haul,and *** access networks would play an important role in F5G to support radio access network and fixed access ***-latency PON is a key for cost effective-haul traffic *** terms of signal transmission,intensity modulation directdetection(IM-DD)is a promising scheme due to its simple *** fundamental challenge associated with direct-detection is the disappearance of the transmitted signal’s *** access network,the flexibility and low latency are the two key factors affecting service *** this article,we review the evolution of PONs and the challenges of current PONs in *** analyze key enabling digital signal processing(DSP)techniques,including detection linearization for direct-detection and simplified coherent detection,adaptive equalizers,digital filer enabled flexible access network and low-latency inter-ONU ***,we discuss the developing trends of future optical access networks.

关键词： optical fiber communication flexible access network optical field recovery inter-ONU communication

Beyond 100 Gb/s optical OFDM Transmitted in optical Long-Haul System

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China communications 2009年第3期6卷 103-109页

作者： Zhang Jing Qiu Kun Bao Weibing Deng Mingliang Li Yonggang Zhang Hongbo Key Lab of Broadband optical fiber Transmission and communication Networks of the Ministry of Education UESTC Chengdu 610054 Sichuan China

100 G Ethernet is considered to become the next generation Ethernet standard for IP *** 100 Gb/s transmission systems and their performance are *** and analysis for 100 Gb/s transmission systems have been *** is demon... 详细信息

关键词： optical fiber communication optical orthogonal frequency division multiplexing (OOFDM) direct detection coherent OOFDM polarization multiplexing(PDM) optical single side band

Influences on the bandwidth at the drop port of the add/drop filter using a fiber grating coupler by uniform and linearly chirped fiber Bragg grating

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Science China(Information Sciences) 2013年第6期56卷 39-44页

作者： FAN LinYong JIANG WeiWei ZHAO RuiFeng LI Jian PEI Li JIAN ShuiSheng Institute of Lightwave Technology Beijing Jiaotong University Signal & Communicaiton Research Institute China Academy of Railway SciencesBeijing 100081China

Writing a fiber Bragg grating(FBG) in an optical fiber coupler is a very effective way to implement an optical add/drop filter(OADF).In order to analyze the influences on the bandwidth at the drop port of the OADF using fiber grating-assisted mismatched coupler,a uniform FBG and a linearly chirped FBG were written on the coupler,and two different OADFs were *** fiber grating is written in a 2×2 mismatched coupler,which is fused and tapered with a standard single mode fiber(SMF) and a high germanium doped photosensitive fiber,by using a 248 nm ultraviolet *** the OADF using the uniform FBG,the 3 dB and 20 dB bandwidths are 0.1 nm and 0.3 nm,respectively;for the OADF using the linear chirped FBG,the 3 dB and 20 dB bandwidths are 0.8 nm and 2 nm,*** experimental results meet the theoretical analysis *** bandwidth at the drop port of the device can be adjusted by adjusting the chirped coefficient of the linearly chirped FBG.

关键词： optical add/drop filter fiber Bragg grating coupler optical fiber communication