光纤拉曼放大器中级联的受激布里渊散射  

Cascaded stimulated Brillouin scattering in a distributed fiber Raman amplifier

作　　者：刘红林[1] 冯春媛[2] 张在宣[2] 庄松林[1] 

机构地区：[1]上海理工大学光学与电子信息工程学院,上海200093 [2]中国计量学院光电子技术研究所,浙江杭州310018

出　　处：《光电工程》2005年第11期30-32,53,共4页Opto-Electronic Engineering

基　　金：中央财政专项资助;浙江省重大科研项目"分布式光纤拉曼放大器研制"资助(021101558)

摘　　要：在以25kmG652单模光纤为增益介质的光纤拉曼放大器中,观察到了级联的受激布里渊散射。光纤中的双瑞利折射作用导致了二阶布里渊散射光子的出现,加快了二阶布里渊散射的出现。在拉曼增益的作用下,随着二阶布里渊散射的饱和会出现级联的多阶布里渊散射,形成梳状光谱。该梳状光谱也具有明显的阈值特性。在拉曼泵浦功率是1200mW的时候,出现梳状光谱的阈值在1.5到2.5dBm之间。在传输系统中,级联的受激布里渊散射会导致放大器的增益饱和,严重恶化系统的信噪比,因此必须采用增加信号光的带宽或者对信号光进行调制等措施加以控制。但该现象也有可能被用来制造梳状光源。Cascade stimulated Brillouin scattering （SBS） was observed in a Raman fiber amplifier with 25km G652 single mode fiber as gain media. The distributed feedback due to double Rayleigh scattering brings forth SBS photons and accelerates the occurrence of second order SBS. Comb-like spectrum lines of cascade Brillouin scattering appear with the saturation of second order Brillouin scattering under Raman gain effect in experiment. The comb-like spectrum shows the feature of threshold too. The threshold of the comb-like spectrum is 1.5 to 2.5 dBm when the power of Raman pump is 1200 mW. In transmission system, the cascade SBS may cause the saturation of amplifier and deteriorate the SNR of the system, so measures such as increasing spectral width of signal light or implementing signal modulation shall be adopted to control it. On the other hand, such feature may be used to make comb-like light source.

关 键 词：光纤拉曼放大器 受激布里渊散射 阈值 

分 类 号：TN722[电子电信—电路与系统]