偏振模色散对级联PSA高速光纤通信系统性能的影响

根据耦合非线性薛定谔方程,在考虑不同大小光纤偏振模色散时,通过计算机系统仿真,对分别采用EDFA和PSA作为在线放大器在不同传输速率下的系统传输性能进行了分析。结果表明,在不同系统速率和不同偏振模色散下,采用PSA作为在线放大器的系统性能优于EDFA系统性能。     

偏振模色散对高速光纤通信系统性能的影响

为研究偏振模色散对级联PSA高速光纤通信系统性能的影响,在了解PSA构成及放大原理后,利用耦合非线性薛定帶方程,采用计算机仿真技术研究不同信号脉冲波型与大小的光纤偏振模色散对级联PSA高速光纤通信系统性能的影响。仿真结果显示,高斯脉冲的眼图劣化度高于超高斯脉冲的眼图劣化度,PSA相位漂移逐渐增加时,眼图劣化度逐渐增加,PSA色散补偿功能更低,光纤通信系统性能更差,当脉冲指数是[2,2.5]时,级联PSA高速光纤通信系统性能最优;当偏振模色散值提升时,级联PSA高速光纤通信系统性能下降,但始终优于EDFA系统,优势性能并不显著,说明PSA具备偏振模色散补偿功能,却无法完全补偿偏振模色散。     

PMD对平均光孤子系统传输性能影响的研究

文章采用计算机系统仿真的方法,通过数值求解简化的基本传输方程和非线性薛定谔方程,研究了采用相敏光纤参量放大器(PSA)作为在线放大器时,偏振模色散(PMD)对系统传输性能的影响.系统传输方案采用平均孤子系统.仿真结果表明:当PMD系数增大时,孤子脉冲出现分裂和展宽,幅度出现衰减,从而导致系统的传输性能下降.     

在线放大器为PSA的动态孤子通信系统传输性能受光纤色散参量影响的研究

通过计算机系统仿真研究光纤色散参量对以相敏光放大器(PSA)作为在线放大器的动态孤子系统传输性能的影响。研究结果表明,PSA增益的相敏特性使孤子脉冲主瓣幅度因光纤色散而下降,脉宽展宽,出现旁瓣。光纤色散值越大,经长距离传输后,孤子脉冲主瓣的下降幅度和脉宽展宽程度越显著;且旁瓣脉宽越宽。     

一种新的优化喇曼掺Er混合光纤放大器结构

对于给定的非线性损伤，对喇曼／掺Er混合光纤放大器(HFA)结构进行优化，即优化光纤喇曼放大器(FRA)与掺Er光纤放大器(EDFA)的增益比和色散补偿光纤(DCF)长度比，得到一种最优HFA结构。分别比较了最优HFA、一般HFA、全FRA和全EDFA用作接收机前置放大器的噪声性能，以及用于多级链路在线放大器时系统所能到达的最大可传输距离。结果表明，最优HFA能提高系统性能。     

光纤光栅在高速光通信系统中的新应用

光纤光栅以其独特的优点，广泛应用于高速光通信系统中，为此介绍了光纡光栅作为EDFA增益均衡器、色散补偿器和偏振模色散补偿器等在高速光纤通信系统中的应用，分别研究了它们的原理，特点及发展状况。     

级联PSA非零色散位移光纤通信系统传输性能的研究

本文通过计算机系统仿真研究了以相敏光放大器（PSA）作为中继光放大器的非零色散位移光纤通信系统的传输性能,分析了PSA系统的码间干扰（ISI）限制距离与信号速率、光纤色散、放大器间距和放大器平均输出信号功率的关系,以及PSA中泵浦光和信号光之间的相位漂移和信号脉冲波形对级联PSA光传输系统传输性能的影响。     

密集波分复用技术在无锡广电第二平面传输系统的设计与仿真简

城域网中运用DWDM技术可以充分利用光纤较宽的频带资源,极大地提高了系统的传输容量,降低了传输成本。而要将40Gb/s DWDM技术成功用于城域网,还必须考虑色度色散、偏振模色散、放大器设置、光接收机噪声等关键问题。为了更好地解决这些问题,我们建立了仿真系统,对适用于无锡分公司城域网的40Gb/s DWDM系统的放大器设置、色散、光接收机噪声等问题做了仿真分析和规划。     

应用相敏光放大克服光孤子传输系统中Gordon-Haus限制的研究

通过计算机系统仿真研究了应用相敏光放大器(PSA)作为在线放大器的光孤子传输系统，并与相应的掺铒光纤放大器(EDFA)光孤子系统作了比较。仿真了平均孤子和动态孤子两种传输方案．研究结果表明，由于PSA不存在ASE噪声，应用PSA作为在线放大器可以克服光孤子系统中的Gordon-Haus限制．对平均孤子，在没有附加其它的孤子控制技术的情况下，PSA系统孤子的稳定传输距离得到极大的延长．对动态孤子，PSA亦表现出良好的抑制脉冲展宽效果，但脉冲的幅度经长距离传输后显著下降．     

PSA平均光孤子系统传输性能的研究

本采用计算机系统仿真的方法，研究了应用相敏光放大器(PSA)作为在线放大器的采用平均孤子传输方案的光孤子通信系统中，泵浦光与信号光之间的相位漂移、光纤色散对光孤子通信系统传输性能的影响。仿真的结果表明：泵浦光与信号光之间的相位漂移将导致孤子幅度的下降；由于PSA增益的相敏特性，光纤色散导致孤子脉冲主瓣幅度下降，脉宽展宽，出现旁瓣。     

Comparison of EDFA and bidirectionally pumped Raman amplifier in a40-Gb/s RZ transmission system

We numerically compare the performance of a bidirectionally pumped Raman and an erbium-doped fiber amplifier (EDFA) system in a 40-Gb/s dispersion-managed return-to-zero (RZ) transmission. The Raman amplifier system shows a substantially higher Q-value compared to that of the EDFA     

A detailed experimental study on single-pump Raman/EDFA hybrid amplifiers: static, dynamic, and system performance comparison

This paper presents an experimental study on the performance comparison of three different schemes of single-pump dispersion-compensating fiber (DCF)-based Raman/erbium-doped fiber amplifier (EDFA) hybrid amplifiers together with a DCF-based Raman-only amplifier in terms of static properties, dynamic properties, and system impact: Raman-only amplifier (Type I), Raman/EDFA hybrid amplifiers recycling residual Raman pump in a cascaded EDF located either after (Type II) or prior to (Type III) a DCF, and a Raman-assisted EDFA (Type IV), the concept of which was proposed by Kurosawa et al. With respect to the overall gain and system impact based on bit error rate (BER) measurements in a transmission system, the hybrid amplifier of Type II was found to have the best performance among the four types while the Raman-only amplifier shows the best tolerance to transient response.     

从OFC2001看世界光纤通信的新发展

文中报道了OFC2001会议的概况,并从光纤传输系统、宽波段光放大器、可调谐光源技术,阵列波导光栅、偏振模色散的研究和补偿技术五个方面来介绍光纤通信的最新发展。     

高速传输系统的偏振模色散补偿技术

随着光网络的快速发展,系统的传输码率逐渐提升,传输技术也不断地发展和完善。光纤传输系统中的各种因素造成的影响程度也出现了很大的变化。针对偏振模色散(PMD)对高速光纤传输系统造成的损害,对目前光域和电域的PMD补偿技术进行详细的阐述。通过比较各种方案,指出高速光纤传输系统中PMD的光域补偿技术更适用,发展空间大,而且性能好。其中光纤光栅补偿技术应用广泛,对单信道和多信道传输系统都适用。因此,光纤光栅技术最具发展潜力。     

Tracking and separation of time-varying principal states of polarization in optical fiber link for first-order PMD compensation and its filter-dependent performance

We propose a simple method for tracking and separating time-varying principal states of polarization (PSP) occurring in a fiber-optic transmission link with polarization mode dispersion (PMD) for use in PMD compensation. The proposed method uses as a feedback monitoring signal the bandpass-filtered RF power at bit-rate frequency for NRZ signal format. We demonstrated the operating principle of the method through theoretical simulation and experiment using an automatically adaptive PMD compensator employing a single polarization beam splitter (PBS). The effects of electrical filtering on the PSP tracking performance were also investigated by using three types of filters, i.e., a low-pass filter (LPF), a band-pass filter (BPF), and a high-pass filter (HPF). The simulation results showed that only a BPF centered at bit-rate frequency was found to allow for tracing and separation of two PSPs via PBS. The proposed method, when applied to a conventional PMD compensator that alternately controls a polarization controller and a delay line, enables separation of PSP control from differential-group-delay (DGD) control, thus allowing fast tracking of rapidly changing PSP in a PMD-impaired optical fiber link and reducing compensation time.     

偏振模色散补偿的实验研究

实验研究了高斯脉冲在PMD系数为225Ps／km^1/2的光纤中传输,发现超高的偏振模色散引起脉冲分裂,并用基模的两正交偏振分量耦合走离解释了脉冲分裂的成因．用PSP法实验研究了超高PMD的补偿,使输入光脉冲的偏振态对准光纤的偏振主态,可以大大减弱光纤PMD对传输信号的影响。     

The Effect of System and Amplifier Parameters on the Performance of Average Soliton Transmission System Using PSA as In-Line Amplifier

In this paper,the effect of system and amplifier parameters on the performance of soliton transmission systemusing Phase Sensitive Amplifier(PSA)as in-line amplifier has been researched theoretically by computer simulation.Since in PSA soliton system the performance of average soliton regime is much better than that of dynamic soliton regime,in our simulation we only considered average soliton regime.Our simulation results show that although using PSA as in-line amplifiers in soliton system can not only overcome Gordon-Haus restriction but also suppress solitons interaction,lengthen soliton stable transmission distance significantly,the system and amplifier parameters have to be chosen carefullyin order to get a better system perorformance.     

基于铒镱共掺光纤放大器的仿真研究

基于铒镱掺杂光纤放大器具有光纤短增益特性好的优点,对在混合光纤放大器中用铒镱掺杂光纤放大器来代替掺铒光纤放大器的方法进行了研究,并对铒镱光纤的长度和掺杂浓度进行了精心的选择,而后利用仿真软件对在2.5Gb/s和10Gb/s速率下的混合光纤放大的DWDM系统进行了仿真分析.