掺饵光纤放大器多信道增益谱迭代测试法

针对多信道放大时掺饵光纤放大器（ＥＤＦＡ）的增益谱随饱和深度而变化的现象,本文介绍了ＥＤＦＡ增益谱在等效饱和条件下的双滤长和宽谱光源迭代测试法及等效 饱和信号功率的计算公式。使用这种方法只需少数几次迭代即可准确测出当ＥＤＦＡ应用于波分复用系统的各信道的实际增益,实验测得结果的误差不大于０．１５ｄＢ。     

掺铒光纤放大器多信道增益谱迭代测试法

针对多信道放大时掺铒光纤放大器（ＥＤＦＡ）的增益谱随饱和深度而变化的现象，本文介绍了ＥＤＦＡ增益谱在等效饱和条件下的双波长和宽谱光源迭代测试法及等效饱和信号功率的计算公式．使用这种方法只需少数几次迭代即可准确测出当ＥＤＦＡ应用于波分复用系统时各信道的实际增益，实验测得结果的误差不大于０１５ｄＢ．     

光波分复用技术讲座：第二章 掺铒光纤放大器的原理及其在DWDM中的应用

掺铒光纤放大器（ＥＤＦＡ）已成为密集波分复用（ＤＷＤＭ）系统中最关键的组成部分,从ＥＤＦＡ的原理出发,描述其工作过程,并简要介绍了各种状态下的性能特点。在ＤＷＤＭ系统中,ＥＤＦＡ同时放大多个波长,并级联使用,带来了功率及增益平衡等新问题,结合波分复用（ＷＤＭ）系统,讨论了ＥＤＦＡ的增益及功率均衡问题,对目前广泛使用的平衡增益和稳定功率的几种方法进行比较。     

具有平坦增益谱的氟化物掺饵光纤放大器

ＩＥＥＥ会员Ｍａｋｏｔｏ Ｙａｍａｄａ等人成功地开发出氟化物掺饵光纤放大器。各信道的输入信号功率为－２０ｄＢｍ时，８信道波分多路复用信号在１５３２－１５６０ｎｍ波长范围的平均增益达２６ｄＢ，增益偏移低于１．５ｄＢ。。此外，ＭａｋｏｔｏＹａｍａｄａ等人在本文中研究了Ｆ－ＥＤＦＡ对ＷＤＭ信号的放大性能。     

波分复用传输系统中EDFA-BDE模块的仿真研究

本文在ＣＯＭＤＩＳＣＯ信号处理工作系统中研究了用于波分复用传输系统的掺铒光纤放大器块图编辑器仿真模块。仿真模块考虑了前向及后向放大的自发辐射噪声。通过信息计算ＥＤＦＡ－ＢＤＥ模块,优化设计了掺铒光纤的长度。在含８级ＥＤＦＡ的ＷＤＭ光传输系统的仿真中论证了模块的实际应用。本文在输出信号幅度及ＡＳＥ噪声谱上都获得了与前期发表的实验相一致的仿真结果,证明了ＥＤＦＡ－ＢＤＥ模块在高饱和状态下的实际可用性。     

WDM系统信道串话分析

Ｆａｂｒｙ－Ｐｅｒｏｔ光滤汉器是波分复用（ＷＤＭ）系统中实现信道解复用的关键器件，本文根据Ｆ－Ｐ腔光滤波器特性，给出了ＷＤＭ系统串话模型，并分析了信道误码率和信道串话造成的的功率代价。     

一种新颖的全光纤波分复用光通信系统

提出了一种新的以光纤光栅为基础的全光纤激光器复用、全光纤分路插入加全光纤放大（ＥＤＦＡ）的波分复用通信光纤集成系统，说明了该系统的设计原理。     

带有Bragg光栅的高泵浦效率的新型EDFA结构

本文首次提出了泵浦反射型的ＥＤＦＡ结构、理论计算表明，泵浦反射型ＥＤＦＡ较之常规型ＥＤＦＡ有高的泵浦效率，高的３ｄＢ压缩饱和输出功率，低的泵浦阈值，同时由于采用光纤Ｂｒａｇｇ光栅作反射器，使这种泵浦反射型ＥＤＦＡ在工艺上容易实现。     

波分复用光传输用混合型掺铒光纤放大器

本文介绍波分复用光传输系统使用的，基于掺ＡｌＥＤＦ和掺Ｐ／ＡｌＥＤＦ适当组合而开发出的混合型掺铒光纤放大器及其特性。     

掺铒光纤放大器噪声特性的全面分析

本文对掺铒光纤放大器（ＥＤＦＡ）的噪声特性进行了全面的分析。把光信号和ＥＤＦＡ中放大自发辐射（ＡＳＥ）产生的量子噪声，以及信号－ＡＳＥ拍频噪声和ＡＳＥ－ＡＳＥ拍频噪声一并加以考虑。通过数值模拟，给出了不同信号功率和泵浦功率下的ＥＤＦＡ噪声系数。这些结果对优化ＥＤＦＡ的工作参量及其工程制作具有一定的指导作用。     

New pump wavelength of 1540-nm band for long-wavelength-band erbium-doped fiber amplifier (L-band EDFA)

A long-wavelength-band erbium-doped fiber amplifier (L-band EDFA) using a pump wavelength source of 1540-nm band has been extensively investigated from a small single channel input signal to high-power wavelength division multiplexing (WDM) signals. The small-signal gain coefficient of 1545-nm pumping among the 1540-nm band is 2.25 times higher compared to the conventional 1480-nm pumping. This improvement in gain coefficient is not limited by the pumping direction. The cause for this high coefficient is explained by analyzing forward- and backward-amplified spontaneous emission spectra. The gain spectra as a function of a pump wavelength suggest that a broadband pump source as well as a single wavelength pump can be used as a 1540-nm-band pump. In the experiment for high-power WDM signals, the power conversion efficiency for 256 WDM channel input is 48.5% with 1545-nm pumping. This result shows more than 20% improvement compared with the previous highest value for the L-band EDFA. Finally, the 1545-nm bidirectionally pumped EDFA is applied as a second stage amplifier in an in-line amplifier of an optical communication link with a 1480-nm pumped first stage EDFA, in which the input power of the second-stage EDFA is +2.2 dBm. The power conversion efficiency yields a 38% improvement without noise figure degradation compared with the case of 1480-nm pumping.     

Dynamic power-equalized EDFA module based on strain tunable fiberBragg gratings

An adaptive power-equalized erbium-doped fiber amplifier (EDFA) module is proposed and experimentally demonstrated by using strain tunable fiber Bragg gratings (FBGs). In a demonstration for a five-channel wavelength-division-multiplexed (WDM) system, the EDFA module can effectively reduce the power variation from 11 dB to 0.3 dB. Measured power penalty for 2.5-Gb/s data is less than 0.5 and 1.1 dB for 5 and 17 dB of signal attenuation by tunable FBGs, respectively. The power-equalized EDFA module can find wide applications in WDM lightwave transmission systems     

高功率双包层掺镱光纤放大器

为满足高功率激光系统末级功率提升的要求,研制了高功率光纤放大器,它采用双包层掺Yb3＋光纤作为增益介质,利用泵浦合束器进行泵浦的级联放大。通过有效的热管理及输出稳定技术,对于大信号1053nm波长的输入光,该光纤放大器的增益大于22dB;采用增益均衡技术,20nm带宽范围内增益平坦度小于2dB。     

均衡掺铒光纤放大器及8×2.5Gb/s 450km传输实验

　Aiming at the problem of dynamically gain imbalance in cascaded amplification WDM system,a series of dynamically gain equalized Erbium-doped fiber power booster and inline amplifier were designed and built,in which the population inversion was controlled.The equalisation transmission was demonstrated by using this kind of EDFA.     

Dispersion-compensating Raman/EDFA hybrid amplifier recycling residual Raman pump for efficiency enhancement

We experimentally demonstrate a novel concept of the dispersion-compensating Raman/erbium-doped fiber amplifier hybrid amplifier recycling residual Raman pump for increase of overall power conversion efficiency. The proposed dispersion-compensating hybrid amplifier system has only one pump source for Raman amplification in the dispersion-compensating fiber (DCF) and the residual pump power after the DCF is recycled for secondary signal amplification in an erbium-doped fiber cascaded to the DCF. Using the proposed scheme, we achieve the significant enhancement of both signal gain and effective gain-bandwidth by 15 dB (small signal gain) and 20 nm, respectively, compared to the performance of the Raman-only amplifier.     

Extending transmission distance of high-density WDM systems usingpost transmitter fiber Raman amplifiers

The authors investigate the behavior of multichannel signals in a high-density wavelength division multiplexing (WDM) system with the consideration of stimulated Raman scattering. A parameter to evaluate the depth of Raman crosstalk is provided, and the transmission distance limitation imposed by Raman crosstalk is analyzed. To extend the system transmission distance, a post-transmitter fiber Raman amplifier is used. The allocation of signal channels on the pump gain profile is discussed. It is found that there exists an optimum pump power which results in a maximum amplifier gain. The example shows that the transmission distance limitation imposed by Raman crosstalk can be extended by 20 km for a 30-channel system with 0.25-dB/km fiber loss     

多波长泵浦与级联光纤相结合RFA的优化分析

基于多波长泵浦与级联光纤相结合的方法,文章使用遗传算法对泵浦波长、功率及两段光纤的长度进行优化,采用数值解法对100信道的波分复用系统进行仿真获得了约0.069 5 dB的增益平坦度,增益值为13.15 dB.同时对泵浦光功率和信号光功率随光纤长度的变化进行了分析.     

级联光纤参量放大器的增益特性分析

首先介绍了级联结构光纤参量放大器的工作原理,即通过两种光纤色散补偿来平坦信号输出增益。其次推导出小信号近似下单泵浦级联光纤参量放大器的信号输出增益表达式,并在此基础上利用Matlab软件对影响增益特性的各个参数进行数值分析。结果表明,级联光纤参量放大器的峰值增益与增益带宽,受到分段数、泵浦光功率、泵浦波长、色散补偿光纤(DCF)长度、高非线性光纤(HNLF)的零色散波长、HNLF长度、HNLF非线性系数和HNLF色散斜率的影响。     

波分复用系统中四波混频引入光信噪比的恶化及其抑制

本文对陆上级联接掺铒光纤放大器（ＥＤＰＡ）波分复用光纤通信系统中国波混频所造成的各个光信道光信噪比的恶化提出了一套计算方法，并结合常规单模光纤及一种特殊设计的色散位移光纤进行了分析计算。结果表明：在四波混频所引入的光信噪比恶化中，因新生频率分量导致的噪声增加一般远大于光信号功率的减弱。不等信道间隔划分能有效地避免四波混频的影响，而光滤波器的带宽应在允许范围内尽量压窄。对采用色散补偿技术的级联ＥＤＦＡ波分复用系统，在同一光中继段内，使常规单模光纤置于特殊设计的色散位移光纤之前，能进一步减少四波混频带来的光信噪比的恶化。     

Performance analysis of high-density WDM systems using Raman amplification

The applications of Raman amplifiers as repeater amplifiers or post-transmitter amplifiers in a high-density WDM system are theoretically investigated. There exists an optimum pump power which results in maximum amplifier gain. The result shows that amplifier gains up to 50 dB and 20 dB are achievable for use as a repeater and a post-transmitter amplifier, respectively.<>