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Health Monitoring of Long-Haul Fiber Communication System Using Chaotic OTDR 被引量:1
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作者 Mengmeng Chen Mingjiang Zhang +3 位作者 Shaoxiang Chen Jianguo Zhang Senlin Yan Yuncai Wang 《China Communications》 SCIE CSCD 2020年第5期1-11,共11页
A novel chaotic optical time-domain reflectometry(OTDR)-based approach was proposed for monitoring long-haul fiber communication systems with multiple fiber segments. The self-phase modulation and group velocity dispe... A novel chaotic optical time-domain reflectometry(OTDR)-based approach was proposed for monitoring long-haul fiber communication systems with multiple fiber segments. The self-phase modulation and group velocity dispersion effects of the optical cable was considered in demonstrating the proof-of-concept experiment and simulation. In experiments, the correlation peaks are clearly obtained from the correlation trace between the reference and reflected(or scattered) light signals propagating in three optical-fiber segments. The technique affords a high spatial resolution of 2 m, and further long-haul fiber simulations indicate that the sensing distance can be more than 3300 km. Thus, the new proposed technique can be effectively applied for health monitoring of long-haul fiber communication systems. 展开更多
关键词 fiber communication system chaotic signal optical time domain reflectometry
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Compensating for Nonlinear Effects in Coherent-Detection Optical Transmission Systems
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作者 Fan Zhang (State Key Laboratory of Advanced Optical Communication Systems & Networks, Peking University, Beijing 100871, P.R.China) 《ZTE Communications》 2012年第1期45-49,共5页
Fiber nonlinearity is one of the most important limiters of capacity in coherent optical communications. In this paper, we review two nonlinear compensation methods: digital backward propagation (BP) and nonlinear ... Fiber nonlinearity is one of the most important limiters of capacity in coherent optical communications. In this paper, we review two nonlinear compensation methods: digital backward propagation (BP) and nonlinear electrical equalizer (NLEE) based on the timedomain Volterra series. These compensation algorithms are implemented in a singlechannel 50 Gb/s coherent optical singlecarrier frequency division multiplexed (CO-SCFDM) system transmitting over 10 × 80 km of standard singlemode fiber (SSMF). 展开更多
关键词 coherent optical communication fiber nonlinearity digital signal processing
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Influence of the nonlinear propagation effect on the optical signal-to-noise ratio of 400G optical fiber communication systems 被引量:3
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作者 秦华强 肖晓晟 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第3期78-82,共5页
The influence of the nonlinear propagation effect on three 400 Gb/s/ch (400G) optical fiber communication systems with typical modulation formats, dual-carrier 16-quadrature amplitude modulation (16QAM), single-ca... The influence of the nonlinear propagation effect on three 400 Gb/s/ch (400G) optical fiber communication systems with typical modulation formats, dual-carrier 16-quadrature amplitude modulation (16QAM), single-carrier 16QAM (single-16QAM), and four-carrier quadrature phase-shift keying, are investigated. The received optical signal-to-noise ratio (OSNR), affected by the nonlinear interference noise together with the amplified spontaneous emission noise, are compared with three 400G systems and a standard 100 Gb/s/ch system by numerical simulations. Both single channel and multichannel cases are considered. Single-16QAM is found to have the best OSNR among those modulation formats. 展开更多
关键词 MODULATION Nonlinear optics optical communication optical fibers optical signal processing Phase shift Phase shift keying Quadrature amplitude modulation Quadrature phase shift keying signal to noise ratio
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Robustness estimation of software-synchronized all-optical sampling for fiber communication systems 被引量:2
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作者 杨爱英 吴翔宇 孙雨南 《Chinese Optics Letters》 SCIE EI CAS CSCD 2009年第3期194-197,共4页
The robustness of the software-synchronized all-optical sampling for optical performance monitoring is estimated for 10-Gb/s fiber communication systems. It reveals that the software-synchronized algorithm is sensitiv... The robustness of the software-synchronized all-optical sampling for optical performance monitoring is estimated for 10-Gb/s fiber communication systems. It reveals that the software-synchronized algorithm is sensitive to the signal degradation caused by chromatic dispersion and nonlinearity in optical fibers. The influence of timing jitter and amplitude fluctuation of the sampling pulses is also investigated. It is found that stringent requirements are imposed on the quality of the sampling pulse and the tolerance of 1-dB Q penalty is measured. Considering the practically available optical sampling pulse sources, the results indicate that the amplitude fluctuation of the sampling pulses has the dominant impacts on the software-synchronized method. 展开更多
关键词 communication systems Computer software optical fibers signal filtering and prediction Timing jitter
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High order modulation format identification based on compressed sensing in optical fiber communication system 被引量:1
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作者 惠柄翔 唐先锋 +2 位作者 高娜 张文博 张晓光 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第11期14-18,共5页
We propose a method of modulation format identification based on compressed sensing using a high-order cyclic cumulant combined with a binary tree classifier.Through computing the fourth-order cyclic cumulant of the p... We propose a method of modulation format identification based on compressed sensing using a high-order cyclic cumulant combined with a binary tree classifier.Through computing the fourth-order cyclic cumulant of the pretreated band signal,which is obtained by compressed sensing with the sampling rate much less than the Nyquist sampling value,the feature vector for classification is extracted.Simulations are carried out in the optical coherent fiber communication system with different modulation formats of multiple phase-shift keying and multiple quadrature amplitude modulation.The results indicate that this method can identify these modulation formats correctly and efficiently.Meanwhile,the proposed method is insensitive to laser phase noise and signal noise. 展开更多
关键词 Binary trees Compressed sensing Face recognition GEARS MODULATION optical communication optical fibers Phase noise Phase shift Phase shift keying signal reconstruction
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Exploiting the Faster-Than-Nyquist Concept in Wavelength-Division Multiplexing Systems Using Duobinary Shaping 被引量:1
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作者 Ekawit Tipsuwannakul Magnus Karlsson Peter A. Andrekson 《ZTE Communications》 2012年第1期23-29,共7页
This paper begins with Nyquist wavelengthdivision multiplexing (WDM) and then introduces fasterthanNyquist. In fasterthanNyquist a certain amount of intersymbol interference (ISI) is accepted, which violates the f... This paper begins with Nyquist wavelengthdivision multiplexing (WDM) and then introduces fasterthanNyquist. In fasterthanNyquist a certain amount of intersymbol interference (ISI) is accepted, which violates the fundamental principle of Nyquist WDM. This results in muchrelaxed transceiver bandwidth and simpler spectral design. However, in fasterthanNyquist, implementation complexity is shifted from the transmitter side to the receiver side. Therefore, successful application of fasterthanNyquist depends on innovation in the receiver structure. In this paper, we discuss the guidelines for implementing suboptimum, lowcomplexity receivers based on fasterthanNyquist. We suggest that duobinary shaping is a good technique for trading off achievable spectral efficiency, detection performance, and implementation complexity and might be preferable to Nyquist WDM. Experiments are conducted to verify robustness of the proposed technique. 展开更多
关键词 coherent detection digital signal processing optical fiber communications spectralefficiency wavelength division multiplexing
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Realization of Rapid Debugging for Detection Circuit of Optical Fiber Gas Sensor: Using an Analog Signal Source
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作者 Changbin TIAN Jun CHANG Qiang WANG Wei WEI Cunguang ZHU 《Photonic Sensors》 SCIE EI CAS CSCD 2015年第1期91-96,共6页
An optical fiber gas sensor mainly consists of two parts: optical part and detection circuit. In the debugging for the detection circuit, the optical part usually serves as a signal source. However, in the debugging ... An optical fiber gas sensor mainly consists of two parts: optical part and detection circuit. In the debugging for the detection circuit, the optical part usually serves as a signal source. However, in the debugging condition, the optical part can be easily influenced by many factors, such as the fluctuation of ambient temperature or driving current resulting in instability of the wavelength and intensity for the laser; for dual-beam sensor, the different bends and stresses of^the optical fiber will lead to the fluctuation of the intensity and phase; the intensity noise from the collimator, coupler, and other optical devices in the system will also result in the impurity of the optical part based signal source. In order to dramatically improve the debugging efficiency of the detection circuit and shorten the period of research and development, this paper describes an analog signal source, consisting of a single chip microcomputer (SCM), an amplifier circuit, and a voltage-to-current conversion circuit. It can be used to realize the rapid debugging detection circuit of the optical fiber gas sensor instead of optical part based signal source. This analog signal source performs well with many other advantages, such as the simple operation, small size, and light weight. 展开更多
关键词 optical fiber gas sensor detection circuit analog signal source rapid debugging
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Low-resolution optical transmission using joint shaping technique of signal probability and quantization noise 被引量:2
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作者 黄宏宇 于振明 +3 位作者 舒亮 孙凯旋 尹飞飞 徐坤 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第5期11-17,共7页
In this paper,we propose and experimentally demonstrate a joint shaping technique to improve the performance of a lowresolution transmission system for the first time,to the best of our knowledge.The joint shaping tec... In this paper,we propose and experimentally demonstrate a joint shaping technique to improve the performance of a lowresolution transmission system for the first time,to the best of our knowledge.The joint shaping technique combines probabilistic shaping(PS)and error feedback noise shaping(EFNS).In the 40-Gbaud intensity-modulation direct-detection(IM/DD)experimental transmission system,a bit-error-rate(BER)of 3.8×10^(-3)can be achieved easily with the joint shaping at the physical number of bits(PNOB)of 3.In the 30-Gbaud dual polarization(DP)coherent experimental transmission system,a BER below 1×10^(-3)is easily obtained with a 3-bit quantizer by using joint shaping.The optimization of the shaping degree is also analyzed. 展开更多
关键词 optical fiber communication QUANTIZATION digital signal processing
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Fiber Nonlinearity Mitigation by Improved Zero-Interpolation Method in Coherent Optical OFDM Systems 被引量:1
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作者 HAO Yaohong LI Yuquan WANG Rong 《Wuhan University Journal of Natural Sciences》 CAS 2011年第1期38-42,共5页
An improved zero-interpolation method with signal clipping to improve fiber nonlinearity tolerance in the long-haul coherent optical orthogonal frequency division multiplexing system (CO-OFDM) is presented. The new ... An improved zero-interpolation method with signal clipping to improve fiber nonlinearity tolerance in the long-haul coherent optical orthogonal frequency division multiplexing system (CO-OFDM) is presented. The new technique is implemented by interpolating zero subcarriers and selecting the odd subcarriers to carry data and clipping conventional CO-OFDM signal at zero. With such a scheme,the effect of fiber nonlinearity can be miti-gated,and the wanted signal carried on odd subcarriers is or-thogonal to clipping noise,which falls on even frequencies. Simu-lation shows that the system Q value is improved by more than 2 dB at the length of 960 km 展开更多
关键词 coherent optical communication fiber nonlinearity signal clipping orthogonal frequency division multiplexing (OFDM)
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四路视频和音频信号的光纤传输系统设计 被引量:7
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作者 林琳 王加贤 凌朝东 《华侨大学学报(自然科学版)》 CAS 北大核心 2011年第1期35-38,共4页
利用可编程式逻辑器件、并串转换器和串并转换器及光收发器,设计一个专用的数字光纤传输系统.将多路模拟基带信号的视频和音频进行数字化,形成高速数字流;然后,在现场可编程门阵列(FPGA)上对高速数字流进行时分复用,并通过并串转换器转... 利用可编程式逻辑器件、并串转换器和串并转换器及光收发器,设计一个专用的数字光纤传输系统.将多路模拟基带信号的视频和音频进行数字化,形成高速数字流;然后,在现场可编程门阵列(FPGA)上对高速数字流进行时分复用,并通过并串转换器转换为串行数字流,送到光发射器;最后,通过光发射器发射耦合进入光纤传输.接收端则进行相反的操作,还原出原来的模拟基带信号.实验证明,系统工作性能稳定可靠,实时传输效果好. 展开更多
关键词 光纤传输 模/数转换 数/模转换 时分复用 视频信号 音频信号
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分布式光纤振动传感系统中数据采集及信号处理系统设计 被引量:5
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作者 李彩华 滕云田 李小军 《地震工程与工程振动》 CSCD 北大核心 2012年第1期161-167,共7页
本文主要介绍了一套分布式光纤振动传感系统中的数据采集及信号处理系统,该系统设计采用高性能的运算放大电路完成光电信号调理,以高精度差动模数转换器AD9246完成模数转换工作,并选用高性能FPGA作为核心逻辑控制器,并以低功耗的OMAP-L... 本文主要介绍了一套分布式光纤振动传感系统中的数据采集及信号处理系统,该系统设计采用高性能的运算放大电路完成光电信号调理,以高精度差动模数转换器AD9246完成模数转换工作,并选用高性能FPGA作为核心逻辑控制器,并以低功耗的OMAP-L137作为CPU负责振动数据计算、网络通讯等工作,从而使该-OTDR分布式光纤振动传感系统测量范围扩展到25 km范围。本文通过计算相邻测点振动增量方法检测是否发生了振动入侵,提高了分布式光纤振动入侵检测的灵敏度。该设计方法提高分布式光纤振动传感系统的信噪比,使得该系统振动检测灵敏度提高、抗干扰能力增强,因此该分布式光纤振动传感系统可以用于实际工程的振动监控。 展开更多
关键词 分布式光纤振动传感系统 模数转换 信噪比 振动入侵
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宽带混沌激光实现高速随机数的产生 被引量:1
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作者 张建忠 李璞 +2 位作者 张英英 陈莎莎 王云才 《深圳大学学报(理工版)》 EI CAS 北大核心 2011年第4期316-324,共9页
报道该课题组基于宽带混沌激光实现高速随机数产生的最新研究成果.利用外光注入反馈半导体激光器产生带宽为16.8 GHz的混沌激光作为物理熵源,经比较、触发实现对混沌信号1位模数转换,硬件产生速率达2.87 Gbit/s的随机数.实验研究了通过... 报道该课题组基于宽带混沌激光实现高速随机数产生的最新研究成果.利用外光注入反馈半导体激光器产生带宽为16.8 GHz的混沌激光作为物理熵源,经比较、触发实现对混沌信号1位模数转换,硬件产生速率达2.87 Gbit/s的随机数.实验研究了通过8位模数转换提取1 Gbit/s随机数的实现方案.为突破电子器件带宽限制,实现了与光通信网络信号直接兼容加密,提出并证实了基于宽带混沌激光实现速率高达10 Gbit/s的全光随机数产生方案.上述方案产生的随机数全部通过美国国家标准与技术研究院(NIST)及国际通用随机数检测程序(ENT)的测试. 展开更多
关键词 混沌激光 随机数 模数转换 全光信号处理 半导体激光器 光通信
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光纤陀螺捷联系统数据采集方案研究 被引量:5
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作者 齐英鑫 袁瑞铭 +1 位作者 丛丽 董浩 《应用科技》 CAS 2004年第1期20-22,共3页
根据光纤陀螺捷联系统的要求,提出了基于高分辨率模数转换器和数字信号处理器的加速度计数据采集方案.同时根据捷联系统3个通道输出速度的要求,设计了并行采集方案,并对于高分辨率模数转换器的选择作了讨论计算.
关键词 光纤陀螺捷联系统 数据采集 数字信号处理器 模数转换器 加速度计 加速度测量系统
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新型光谱测量系统的信号接收与数据处理 被引量:1
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作者 幸芦笙 李剑白 刘祥霞 《半导体光电》 CAS CSCD 北大核心 1997年第4期253-256,共4页
叙述了GK型自动测色配色仪光谱测量系统的硬件构成及其工作原理,论述了软件设计思想,给出了实验测试结果。
关键词 光谱测量系统 自动测色 数据处理
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传输系数自校准的宽带模拟信号光纤传输系统 被引量:1
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作者 刘逸飞 郭景海 +4 位作者 吴伟 程引会 马良 赵墨 李进玺 《现代应用物理》 2022年第2期24-31,共8页
分析了模拟信号光纤传输中电光幅度调制的基本原理及导致传输系数难以恒定的原因,提出了一种集成可控标准方波的方法,用于传输系数的实时修正。以线性晶体管放大器和单片机微处理器为核心,设计了具有传输系数自校准功能的模拟信号光纤... 分析了模拟信号光纤传输中电光幅度调制的基本原理及导致传输系数难以恒定的原因,提出了一种集成可控标准方波的方法,用于传输系数的实时修正。以线性晶体管放大器和单片机微处理器为核心,设计了具有传输系数自校准功能的模拟信号光纤传输系统,并进行了实验室标定。标定结果表明,传输系统-3 dB带宽的工作频率为20 kHz~1.38 GHz,时域传输系数为0.66,线性动态范围为40 dB,本底噪声为4 mV。比较了2种不同测试环境下传输系统的性能,修正前,传输系数测量的相对偏差高达9%,修正后,相对偏差可小于1%,验证了传输系数自校准的可行性与准确性。在此基础上,介绍了传输系统在前沿为380 ps脉冲波形的传输测试和电磁脉冲辐照下线缆耦合电流测试上的应用,测量结果表明,传输系统具有良好的信号保真度和抗干扰性能,能提高测量准确性,具有广阔的应用前景。 展开更多
关键词 光纤传输系统 宽带模拟信号 传输系数 自校准 幅度调制
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光纤通信在ECRHTANK高压系统中的应用研究 被引量:1
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作者 刘凯峰 张德祥 《电气应用》 北大核心 2005年第2期80-82,共3页
研究了光纤通信在高压系统中的应用。根据所传输信号在系统中的作用,选择适当的信号调制方式对提高系统的安全性能和性价比都有重要意义。对于模拟量信号,一般采用PFM调制即V-F/F-V转换来实现精确传输。对于要求传输速度很快的信号,采... 研究了光纤通信在高压系统中的应用。根据所传输信号在系统中的作用,选择适当的信号调制方式对提高系统的安全性能和性价比都有重要意义。对于模拟量信号,一般采用PFM调制即V-F/F-V转换来实现精确传输。对于要求传输速度很快的信号,采用直接光强调制来实现快速传输。 展开更多
关键词 ECRH TANK 高压系统 电子回旋共振加热 托卡马克装置 光纤通信
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模拟光纤传输模块的原理与设计 被引量:2
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作者 史萌萌 江海河 《光学与光电技术》 2007年第6期21-23,共3页
光纤与同轴电缆相比,具有抗干扰能力强、传输损耗小、质量轻等优点。采用高线性激光二极管直接调制的方法设计和研制了一种简单、实用和低成本的模拟信号光纤传输模块。测试结果表明,模块的3dB带宽为DC~3MHz,0~5V范围内模块的非线性... 光纤与同轴电缆相比,具有抗干扰能力强、传输损耗小、质量轻等优点。采用高线性激光二极管直接调制的方法设计和研制了一种简单、实用和低成本的模拟信号光纤传输模块。测试结果表明,模块的3dB带宽为DC~3MHz,0~5V范围内模块的非线性误差最大为1.2%,可以用于复杂电磁环境中模拟信号的无干扰传输。 展开更多
关键词 光纤 模拟信号 电磁干扰
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一种基于光纤传输的监测信号处理系统 被引量:2
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作者 韦英华 《现代电子技术》 2008年第15期140-143,共4页
为了解决高压监测系统中的实时监测问题,设计了一种光纤传输的监测信号处理系统,监测信号通过高速模数转换变成数字信号后,通过光发射模块变成光数字信号,用光纤作为传输通道,传到目的地后再由光接收模拟把数字光信号变换成数字电信号,... 为了解决高压监测系统中的实时监测问题,设计了一种光纤传输的监测信号处理系统,监测信号通过高速模数转换变成数字信号后,通过光发射模块变成光数字信号,用光纤作为传输通道,传到目的地后再由光接收模拟把数字光信号变换成数字电信号,经过数模转换后恢复成模拟的监测信号。经过模拟验证后发现这个系统具有实时性强、失真小、系统体积小、抗干扰能力强等优点。 展开更多
关键词 模数转换 光纤传输 数模转换 信号处理
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模拟信号光纤传输系统中色散的研究 被引量:1
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作者 黄锋锋 蒋鹏宇 蒋高健 《山西电子技术》 2020年第3期85-87,共3页
本文介绍了模拟信号光纤通信系统的应用场景,和传统的无线电传输相比的优点,介绍了光纤传输中光纤对模拟信号传输的影响,重点分析了色散对模拟信号光纤产生的影响,分析了色散产生的原因,并分析了解决方案。
关键词 模拟信号光纤通信 色散 材料色散 强度调制
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大功率微波加热设备的模拟信号传输系统设计 被引量:3
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作者 孙浩杰 周新志 雷印杰 《计算机测量与控制》 2015年第1期327-328,332,共3页
在复杂环境下,工业大功率微波加热设备中模拟信号传输系统的设计,对于设备的精确控制和安全运行至关重要;针对现有的模拟信号传输方案在复杂电磁环境下抗干扰能力低下的缺陷,提出一种基于光纤,并整合V/F转换器和FPGA组成的模拟信号传输... 在复杂环境下,工业大功率微波加热设备中模拟信号传输系统的设计,对于设备的精确控制和安全运行至关重要;针对现有的模拟信号传输方案在复杂电磁环境下抗干扰能力低下的缺陷,提出一种基于光纤,并整合V/F转换器和FPGA组成的模拟信号传输解决方案;经过仿真分析和实验验证,该模拟信号传输系统抗复杂电磁干扰能力优于现有方案,同时传输精度高,连续传输误差小于0.1%;该系统为复杂环境下工业大功率微波加热设备中模拟信号的传输提供了一个性能优良的解决方案。 展开更多
关键词 微波加热 电磁干扰 模拟信号 V/F转换 光纤 FPGA
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