57nm的低噪声宽带掺铒光纤放大器

采用双级级联单程放大实现高增益、低噪声的C波段掺铒光纤放大器(EDFA)；采用双级级联双程放大实现高增益、超平坦的L波段EDFA。在此基础上，采用并联结构实现了30dB以上的高增益、3dB带宽为57nm的低噪声宽带EDFA。     

光纤超连续光源的实验研究

从光纤中产生超连续谱(SC)的物理机制出发,对各种非线性效应、光纤参数以及泵浦脉冲参数对SC谱特性的影响进行了简要的理论分析.实验中,利用非线性偏振旋转被动锁模光纤激光器输出的1.5 ps超短脉冲作为泵浦源,无需压缩直接泵浦不同色散特性和长度的光纤,完成超连续谱的产生和谱切片实验.实现20 dB谱展宽大于450 nm,长波段扩展到14780 nm以上(受测试仪器限制),在百纳米范围段的不平坦度<(0.25 dB,达到国内最好水平.     

Tunable multi-wavelength fiber ring laser based on a Hi-Bi fiber loop mirror

A novel tunable multi-wavelength fiber ring laser based on semiconductor optical amplifier (SOA) is proposed by using a high-birefringence (Hi-Bi) fiber loop mirror (FLM) as wavelength filter. With this configuration, the wavelength spacing of this laser can be varied by using the different lengths of Hi-Bi fiber. 8 wavelengths spacing on 450 GHz are experimentally obtained with more than 25-dB signal-to-noise ratio (SNR) for each channel using 1.28-m Hi-Bi fiber in Hi-Bi FLM. The output power variation between different channels is measured to be less than 5.9 dB. The linewidth of each channel is compressed from 0.347 to 0.186 nm by 1.5-m unpumped erbium-doped fiber (EDF). Meanwhile, 17 wavelengths spacing on ITU-gird (100 GHz) are also obtained with 5.9-m Hi-Bi fiber in Hi-Bi FLM. All these channels can be tuned together over 0.4 nm.     

L-波段级联结构掺Er光纤放大器的优化设计

在前级Er光纤（EDF）长度和抽运功率确定的前提下，通过改变后级抽运功率，对L波段级联结构掺Er光纤放大器（EDFA）的两级光纤长度的比例进行了优化研究。当前级的抽运功率和光纤长度分别为60mW和5．4m时，通过对后级参数进行优化，小信号增益达到了30．1634dB，同时噪声指数仅为4．078dB。与其它设计方案相比，该方案更具有实用性：首先，可以通过选择适当的后级抽运功率使级联放大器得到足够大的增益；其次，可以充分利用抽运光能量，从而提高抽运利用效率。     

An 88-nm broadband ASE source with bismuth-based erbium-doped fiber

A broadband amplified spontaneous emission (ASE) source of 88 nm is demonstrated using novel bismuth-based erbium-doped fiber (EDF) with the length of only 49.2 cm in a bi-direction pumping scheme. The maximum output power of 14.3 dBm is obtained under total pump power of 162 mW. The fiber loop mirror which     

全光自动增益箝制及其噪声优化研究

掺饵光纤放大器(EDFA)的自动增益箝制技术在WDM光网络中具有重要的作用，本丈采用BPF方案进行单波长自动增益箝制实验，并取得了满意的箝制效果。而后采用级联放大器的方法，增益箝制放大器的噪声特性得到进一步的优化。     

High gain low noise L-band preamplifier with cascade double-pass structure

An optimized two-stage-cascade double-pass structure L-band preamplifier was proposed and experimentally studied to overcome the shortcomings of low gain coefficient and high noise figure of L-band erbiumdoped fiber amplifier (EDFA). The fiber lengthes of 6.5 and 32.5 m, pump powers of 130 and 119 mW for the first and second stages respectively are used in the experiment. When input signal power is-30 dBm, the amplifier can provide gain above 38.84 dB in a wavelength range of 34 nm (1568-1602 nm), gain ripple less than 2.04 dB (40.88-38.84 dB), and noise figures lower than 5.29 dB with the lowest value of 3.95 dB at 1590 nm. Experimental and simulation results show that this low cost and high pump efficiency amplifier is suitable for the application as an L-band preamplifier in the broadband fiber communication system.     

主动锁模光纤激光器技术

从高重复率、超短脉冲光源——主动锁模光纤激光器的进展历程出发，重点综述其各种稳定方法，并在此基础上讨论颇受关注的多波长产生技术。随着技术的进一步完善，主动锁模光纤激光器将在未来高速光通信系统中发挥举足轻重的作用。     

基于铋基铒纤的新型宽带超荧光光源

首次报道了国内基于新型铋基铒纤的宽带超荧光光源实验研究结果。实验所用的铋基铒纤长度为49.2cm,采用了980nmLD后向泵浦和1480nmLD前向泵浦的双向泵浦结构,并利用光纤环形镜作为宽带反射镜实现双程放大。在总泵浦功率为162mW时获得谱宽88nm功率14.3dBm的宽带超荧光输出。     

级连L波段EDFA优化的数值模拟与实验

对级连结构的L波段EDFA进行了优化设计.首先用加拿大Optiwave的OptiAmplifier4.0数值模拟了在其他条件确定情况下两级光纤长度比例变化对放大器性能的影响,在优化光纤长度比例的基础上,为了得到更宽的L-EDFA的本征平坦增益谱,进一步优化了前后级泵浦功率.在上述条件下利用42 m的铒纤得到实验结果为:ASE谱3 dB带宽1566.84～1606.80 nm(40 nm).在L波段(1570～1605 nm),小信号平均增益约为25 dB,增益不平坦度为±1 dB,噪声指数约为5 dB.