光子晶体光纤与普通光纤混合的Raman放大器

将25km普通单模光纤（SMF）和高非线性光子晶体光纤（PCF）共同作为增益介质组成分布式混合光纤Raman放大器（H—FRA），并考虑前向、后向和双向3种泵浦方式和2种不同参数的PCF在光纤链路的不同位置，研究了其增益和噪声特性。结果表明，当PCF位于增益光纤链路的尾端时，H—FRA具有较好的噪声性能；H—FRA的开关增益不仅与PCF在光纤链路中的位置有关，还与其插入损耗和泵浦方式有关；对位于链路尾端的后向和双向泵浦H—FRA，增益和噪声性能均最佳。

Distributed Hybrid-fiber Raman Amplifiers Based on Photonic Crystal Fiber and Single-mode Fiber

A distributed hybrid-fiber Raman amplifier(H-FRA) with 25 km single-mode fiber(SMF) and a section of photonic crystal fiber(PCF) is proposed and demonstrated.Its on-off gain and noise performance are experimentally investigated in detail.In our experiment,the H-FRAs with three pump schemes and two PCF types with different parameters and length,which are placed at different location of the fiber link,were considered.The experimental results indicate that the optical signal-to-noise ratios(OSNRs) of the H-FRAs are always better when the PCFs are located at the span end.Whereas,the on-off gains are not only dependent on the position of the PCF in the span,but also related to the PCF loss and pump configuration.The on-off gain and noise performance are both better when the PCF is inserted at the span end for backward-and bi-directional-pumped schemes.