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将25 km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。
A hybrid mixed-fiber Raman amplifier (H-FRA) consisting of 25 km ordinary single-mode fiber (SMF) and high-nonlinearity photonic crystal fiber (PCF) is used as the gain medium, and three modes of forward, backward and bidirectional pumping PCF with two different parameters and different positions in the optical fiber link, the gain and noise characteristics were studied. The results show that the H-FRA has better noise performance when the PCF is located at the end of the gain fiber link. The switching gain of the H-FRA is not only related to the position of the PCF in the fiber link, but also to the insertion loss and pump Way; the backward and bi-directional pump H-FRA at the end of the link has the best gain and noise performance.