Tbit/s超大容量光纤通信系统的研究进展

Tbit/s超大容量光纤传输系统促进了光纤通信技术的发展。综述了采用波分复用技术(WDM)、光时分复用技术(OTDM)和WDM/OTDM混合方式的Tbit/s超大容量光传输系统的研究现状、技术实现方式及研究的最新进展。对各种传输系统的优缺点进行了评价,对Tbit/s光纤通信系统的前景作了展望。     

光通信中的光电子器件讲座第五讲 现代光纤通信中的波分复用技术

波分复用技术在现代光纤通信中发展十分迅速，已展现出巨大的生命力和光明的发展前景。中国的骨士网和一些局域网已开始采用波分复用技术，国内一些厂商也正在开发这项技术。文章详细介绍了波分复用技术的发展背景、原理、组成形式、实现方案及其国内外发展情况。     

环太平洋光纤通信进展

自从１９８９年第一个跨太平洋海底光缆通信系统ＴＰＣ－３投入运营以来，环太平洋光纤通信网迅速发展，许多重要的新技术，如光纤放大器技术，色散位移纤，光孤子通信技术和波分复用光纤通信技术，正在或将要在通信网中应用。     

基于Optisystem的单模光纤WDM系统性能仿真

利用Optisystem实现了单模光纤波分复用(WDM)通信系统。在发送端,产生了四路复用的WDM信号,信道采用单模光纤及光放大器,接收端采用光电二极管。利用光谱显示模块显示了关键节点的光谱,利用眼图模块显示了接收端恢复的电信号的眼图。实验表明,建立的单模光纤通信系统具有良好的可靠性,Optisystem非常适合光纤通信系统课程实验。     

第六讲物理与光纤通信

文章通过回顾光纤通信发展的历史，分析光纤通信研究的现状，展望光纤通信发展的未来，阐述了光纤通信发展与物理学发展的密切关系，显示出物理学作为自然科学基础，它在光纤通信技术发展中起核心作用．     

第一讲光电子器件在光纤通信中的应用

光纤通信技术发展的阶段性飞跃总是伴随新型光电材料和功能器件的突破．文章介绍了光纤通信系统中应用到的各种光电子器件，从光纤通信的3个环节：光发送、光接受、光放大为出发点，着重阐述了半导体激光器、光调制器、光检测器、光放大器等关键器件的基本原理、工作特性以及发展现状和趋势，并在回顾传统集成光电子器件发展的同时，展望了以新一代微纳结构光电子器件为基础的光子集成技术的发展趋势。     

光相位共轭色散补偿波分复用系统的传输带宽

导出了光相位共轭器（DPC）接于常规单模光纤链路中点的色散补偿波分复用（WDM）系统传输带宽的估算公式，并用数值仿真的结果验证了公式的正确性；采用不对称接入光相位共轭器提高传输带宽的方法，导出了光相位共轭器接入位置对传输带宽影响的估算公式，利用公式估算和数值仿真的结果表明，当光相位共轭器处于最佳接入位置时，色散补偿的波分复用系统的传输带可以提高近一倍。     

光通信中的光电子器件讲座第四讲 光通信中的波分复用技术及关键器件的原理和应用

通信业务的爆炸式发展，使得通信网络对传输容量要求急剧提高。WDM（wavelength divsion multiplexing）技术是增加系统容量的有效方法。文章介绍了光通信中波分复用技术的基本原理和特点以及波分复用技术中所用的关键器件－波分复用器／解复用器。     

多通道光纤通信教学实验仪的研制

本文探讨了光纤通信的形成、发展及优越性 ,分析了光纤通信系统各组成部分的特点及其传输原理。并介绍了我们将光纤通信技术应用在物理实验教学中的体会     

20GHz注入锁模光纤激光器实验

稳定、波长可调谐的窄脉冲光源是未来光时分复用/波分复用光纤通信系统的重要组成部分。报道了一个20GHz的注入锁模光纤激光器的实验。利用一个10GHz的导体体激光器作为光源，最终得到了波长可调谐的重复频率为20GHz、脉冲宽度为12.4ps的光脉冲，波长的调谐范围为16nm。     

Fiber to the Classrooms: Internet over Fiber Optical CATV System

This study proposed and demonstrated a directly modulated NTSC AM-VSB 77-channel plus Internet access system using a Fabry-Perot (FP) laser diode, an optical isolator, fiber Bragg grating (FBG), wavelength-division-multiplexing (WDM), channel conversion and two-way communication techniques over an existing multimode fiber (MMF) on the author’s campus. Performances of carrier-to-noise ratio (CNR) of >43dB composite second order (CSO) of >53dB and composite triple beat (CTB) of >53dB were obtained over a 2-km MMF transmission. The proposed two-way communication system is simple and suitable for fiber to the classrooms application.     

Applications of Nonlinear Effects in Highly Nonlinear Photonic Crystal Fiber to Optical Communications

Unique dispersion characteristics and enhanced nonlinearity make the small-core photonic crystal fiber (PCF) an ideal candidate for nonlinear optical devices to telecommunication applications. Some technical reasons behind great research interest of highly nonlinear PCFs in optical communication components are reviewed. Nonlinear effects in highly nonlinear PCFs and their research progress are presented. Several typical applications including WDM sources, optical amplification, optical switching, wavelength conversion, optical regeneration and all-optical demultiplexing etc are introduced, together with state-of-the art performances. Some new possible applications and future prospects are discussed.     

A long-haul wavelength division multiplexed system using standard single-mode fiber in presence of self-phase modulation

Performance of a long-haul wavelength division multiplexed (WDM) communication system has been evaluated in presence of nonlinear effects using standard single-mode fiber. Different compensation configurations, namely, post-, pre- and bi-end compensation, have been investigated to mitigate the fiber nonlinear effects. Eye-opening degradation due to mutual interplay between self-phase modulation (SPM) and group velocity dispersion for the compensating techniques has been estimated with respect to the transmission length and the residual dispersion in case of WDM system. Maximum threshold power levels at the bit error rate of 10⁻⁹ limited by the SPM effect have been determined. From a comparison among the compensating techniques, bi-end compensation configuration has been found to be the most suitable technique for any fiber length in case of a WDM communication system.     

副载波单芯双向通信的研究

介绍了实用化的副载波(SC)光纤单芯双向通信的基本方法,分析了副载波双向(SCD)传输技术与副载波复用(SCM)传输技术的主要差别,通过在电域采用频分制技术解决自发自收问题,确定了方向滤波器技术指标,并给出了指标要求.最后给出了采用副载波技术所实现的单芯双向传输系统的性能.     

基于混合光纤放大器的波分复用光纤传输系统研究

在研究了入纤功率、光器件的插入损耗以及非归零码中1码出现的概率对系统误码率影响的基础上,提出了一种基于混合光纤放大器的波分复用(WDM)光纤传输系统设计方案,并对该系统的噪声特性进行了详细地研究。提出了一种抑制前向噪声的有效方法,实现了20路WDM信号320km无误码传输。试验结果对基于混合光纤放大器的波分复用光纤传输系统的设计具有一定的指导意义。     

Wavelength-selective all-fiber filter based on a single long-period fiber grating and a misaligned splicing point

A novel wavelength-selective all-fiber filter using a single long-period fiber grating (LPG) interacting with a misaligned fusion splicing point has been demonstrated. The misaligned splicing point couples a part of the core mode power into the cladding modes, which is then recoupled into the core mode by the following LPG. As an optical path difference is introduced by the differential refractive index of the fiber, an in-fiber Mach-Zehnder interferometer is therefore formed, which may function as a cost-efficient WDM filter with good isolation and low insertion loss.     

级联光纤光栅的发展及应用

简要回顾了光纤光栅的发展、基本分类.在介绍光纤光栅基本特性及其在通信、传感中的应用的基础上,讨论了级联光纤光栅的结构、工作原理、分析方法、基本性质,以及它在传感和通信领域中的应用.展望了级联光纤光栅在传感、通信及其他领域的发展前景.     

Analysis of the Crosstalk in WDM Systems Caused by Cross-phase Modulation in Erbium-doped Fiber Amplifiers

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Optimum algorithm for WDM channel allocation for reducing four-wave mixing effects

A novel channel allocation method, based on optical Golomb ruler (OGR), that allows reduction of the FWM effect while maintaining bandwidth efficiency along with the algorithms has been presented in this paper. Very high-capacity, long-haul optical communication systems can be designed by wavelength division multiplexing (WDM) of high-bit-rate channels and by using erbium-doped fiber amplifiers (EDFAs) to periodically compensate the fiber loss. In such all-optical systems, the effects of chromatic dispersion and nonlinearities accumulate during light propagation, imposing limits on the achievable performance. Chromatic dispersion at 1.55 pm can be effectively reduced by using dispersion-shifted fiber (DSF). The use of very-low-dispersion fiber, however, enhances the efficiency of generation of four-wave mixing (FWM) waves by reducing the phase mismatch naturally provided by the fiber dispersion. For this reason, crosstalk due to FWM is the dominant nonlinear effect in long-haul WDM systems using DSFs. To reduce four-wave-mixing crosstalk in high capacity long-haul repeater less WDM light wave systems, the use of the channel allocation method that involves unequal spaced channels has been proposed.     

一种新型的Tapered光纤光栅

利用耦合模方程对正弦型Ｔａｐｅｒｅｄ光纤光栅的反射谱进行了较为详细的计算和分析,并从实验上进行了验证。利用叠加均匀周期光纤光栅的模板和周期性振幅光栏一次成栅的方法,获得了具有三个反射峰、中心波长间隔为０．８ｎｍ的Ｔａｐｅｒｅｄ光纤光栅,这种光栅具有类似于梳状滤波器的功能,在多波长光纤激光器等方面有重要应用。