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.     

超长距光传输系统中光放大器综合配置技术研究

针对一个超长距OTN光传送网传输案例,我们设计了不同的放大器配置方案并进行了实验研究。通过实验,我们发现使用双向拉曼放大器的配置方案或者使用遥泵放大器的配置方案,都可以完成传输任务,但是系统传输余量比较小。而使用拉曼加遥泵放大器的配置方案则可以得到更多的功率裕度和更高的输出信噪比,而且价格适中。     

光纤分布式拉曼放大技术及其系统设计

首先介绍了光纤分布式拉曼放大器的工作原理、增益带宽和噪声特性，接着阐述了它与EDFA组合使用对系统性能的影响，然后指出传输系统设计应考虑的几个问题，最后介绍了它的广泛应用前景。     

Suppression of transient phenomena in hybrid Raman/EDF amplifier

Transient phenomena of hybrid Raman/erbium-doped fiber amplifier (EDFA) upon optical channel add-drop are investigated. The transient responses of surviving channels are resulted from the combined dynamics of Raman amplifier and EDFA. It is shown that the suggested method employing fast gain control of EDFA only can effectively suppress the transient variation of output power. The transient-suppressing hybrid Raman/EDFA is proven to be enough for wavelength-division-multiplexing networks including reconfigurable optical add-drop multiplexer and/or transparent optical cross-connect, if the optical switching speed is carefully chosen.     

光纤喇曼放大技术及其应用

概述了光纤喇曼放大器的发展情况、分布式喇曼放大器的原理和特性 ,重点阐述了掺铒光纤放大器与喇曼放大技术的组合应用 ;最后指出 ,这两种技术的组合应用能明显提高长距离光纤通信系统性能 ,使掺铒光纤放大器具有更广阔的应用前景。     

拉曼+EDFA宽带混合光放大器的实现和设计优化

基于对增益和噪声特性的分析,本文实现了长距离宽带传输系统中由分布拉曼放大器和掺铒光纤放大器中组成的宽带混合放大单元,并提出了混合放大器进行优化设计的方法,特别指出适当调整拉曼放大器和掺铒光纤放大器的增益谱可以实现噪声谱的平坦.     

A low-noise L-band EDFA with a 1500-nm Raman-pumped dispersion-compensating fiber section

This report presents a low-noise L-band erbium-doped fiber amplifier (EDFA) with a dispersion-compensating Raman amplifier. With an optimized prestage and 1500-nm Raman-pump laser diodes, the proposed EDFA achieved an internal noise figure of less than 4.5 dB over a 33-nm flat gain bandwidth within 0.5 dB at -2 dBm of large signal input power.     

基于EDFA和级联RFA的混合光纤放大器的设计

基于EDFA的理论模型和受激拉曼散射效应的分析理论,利用EDFA和RFA的增益谱互补特性,对拉曼光纤放大器(RFA)采用两根光纤级联方式,研究并设计了EDFA与级联光纤的RFA相结合的混合放大器结构.仿真结果表明:在不使用增益均衡器的条件下,所设计的混合光纤放大器在输出端得到了近似相等的输出光功率,得到了增益平坦度为0.62 dB、波长带宽为70 nm(1 550～1 620 nm)的结果,在密集波分复用光通信系统中有重要的应用价值.     

宽带混合光纤放大器研究

在讨论了宽带混合光纤放大器研究方法的基础上 ,设计了一个增益平坦带宽为 11.4THz的宽带混合光纤放大器 ,并对其增益和噪声特性进行了详细研究 ,最后将其应用于一个 2 0信道的WDM系统 ,实现了 6 4 0km无误码传输     

Performance comparison of various configurations of single-pump dispersion-compensating Raman/EDFA hybrid amplifiers

We show experimental performance comparison of three types of single-pump highly efficient dispersion-compensating Raman/erbium-doped fiber amplifier (EDFA) hybrid amplifiers with respect to gain, noise figure (NF), and stimulated Brillouin scattering (SBS)-induced penalty: Raman/EDFA hybrid amplifiers recycling residual Raman pump in a cascaded erbium-doped fiber located either after (Type I) or prior to (Type II) a dispersion-compensating fiber, and a Raman assisted EDFA (Type III). Type I shows high small-signal gains, moderate large-signal gains, moderate NFs, and high SBS tolerances. Type II shows high small-signal gains, low NFs, and low SBS tolerances. Type III shows moderate small-signal gains, high large-signal gains, moderate NFs, and high SBS tolerances.     

S-band光纤放大器的研究进展

主要介绍了几种S-band光纤放大器,包括光纤喇曼放大器(RFA)、增益位移掺铥光纤放大器(GS-TDFA)、掺铒光纤放大器(EDFA)和光学参量光纤放大器(OPA),综述了其原理、特点、研究现状及发展趋势。     

Performance comparison of an 80-km-per-span EDFA system and a 160-km hut-skipped all-Raman system over standard single-mode fiber

In this paper, we present a comprehensive comparison of the performance of an 80-km-per-span erbium-doped fiber amplifier (EDFA) system and a hut-skipped (160-km-per-span) all-Raman system over standard single-mode fiber (SSMF) for the first time, using semianalytic models. The numerical results reveal that a hut-skipped all-Raman system (using one-order Raman pumping) can achieve comparable performance as the conventional 80-km-per-span EDFA system for a common 50-GHz-spaced 80 /spl times/ 10 Gb/s nonreturn-to-zero (NRZ) wavelength division multiplexing (WDM) system at typical fiber loss of 0.22 dB/km. For 100-GHz-spaced 40 /spl times/ 40 Gb/s carrier-suppressed return-to-zero (CS-RZ) WDM transmission, it was found that a hut-skipped all-Raman system can achieve even better performance than the current 80-km-per-span EDFA system. It was also found that the impact of pattern-dependent Raman crosstalk is more severe than interchannel cross-phase modulation (XPM) in a hut-skipped all-Raman system with 80 /spl times/ 10 Gb/s capacity.     

光纤放大器的研究动态

介绍了国内外光放大器的最新研究动态,主要包括掺铒光纤放大器、掺铥光纤放大器、光纤喇曼放大器及半导体光放大器,并指出相关放大器的发展趋势,最后对光纤放大器的特性进行了比较分析.     

反向泵浦光纤拉曼放大器的实现与传输实验

文章设计并实现了C L波段4泵浦光纤拉曼放大器(FRA),讨论了泵浦驱动电路的设计及掺铒光纤放大器(EDFA)与FRA 150 km混合传输的传输性能.实验结果表明,驱动电路可以稳定可靠地工作,当拉曼放大器的增益＜5 dB时,信号的误码性能不会得到显著提高.实验结果可为EDFA与FRA混合传输系统中增益的配置提供参考.     

100 nm gain bandwidth amplifier based on 980 nm pumped cerium codoped fluoride EDF

A 65 nm EDFA and a 100 nm EDFA/Raman hybrid amplifier with over 20 dB gain based on cerium codoped fluoride EDF with 980 nm pumping are demonstrated. The hybrid configuration also achieves low-noise performance over 100 nm.     

高入纤功率光纤通信系统的可靠性研究

掺铒光纤放大器(EDFA)和拉曼放大器(FRA)的使用,使得光纤通信系统中的入纤功率有了很大的提高.较高的入纤功率不仅会在光纤中引起各种非线性效应,对光脉冲的传输产生影响,也会对光纤本身的可靠性产生影响,为此介绍了高入纤功率对光纤系统的影响,分析了其产生的机理,并提出了应对措施.     

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。     

光纤参量放大器技术及其最新进展

介绍和论述了一种非常有实用前景的基于光纤非线性效应的光参量放大器(OPA)及其最新技术进展．最新发展揭示了它的很多技术特性优于传统的掺铒光纤放大器(EDFA)、半导体光放大器(SOA)和近年来很热门的光纤拉曼放大器(FRA)，如对信号的调制形式、比特率的完全透明性、相位共轭、超宽的增益带宽、很低的噪声指数和具备优异的全光波长转换功能．     

基于喇曼光纤的可变增益光放大器研究

通过分析WDM系统中全光增益控制EDFA(GC-EDFA)的优缺点,提出了一种新的可用于WDM城域网中的基于分布式喇曼光纤放大器的可变增益光放大器结构,并分析了通过监视前馈增益控制喇曼放大器的ASE信号来改善跨距损耗的扩展结构,使增益动态范围可从17dB变化到28dB以补偿跨损,当跨损变化从 5dB到-5dB时,能使输出光功率保持在0.15dB.     

Cross-phase modulation in an L-band EDFA

We measure the cross talk in a wavelength-division-multiplexed (WDM) system arising from cross-phase modulation (XPM) in an L-band erbium-doped fiber amplifier (EDFA). This effect has the potential of becoming the dominant nonlinear crosstalk mechanism in L-band WDM systems using standard fiber. We discuss how appropriate amplifier design can reduce the XPM in the EDFA