So for this system, in order to realize long distance transmission, the optical fiber dispersion coefficient must be small.
显然，对这种系统，要实现长距离传输，必须采用较低色散系数光纤。
While optical fiber Raman laser (RFL) can be a good pump of FRA. The coupling coefficient between FRL and the transmission fiber is very small, so the pump and the amplifier can be compatible easily.
而光纤拉曼激光器(RFL)又作为FRA的泵浦源，它与光纤的耦合损耗小，可以实现泵浦与放大的良好兼容。
While optical fiber Raman laser (RFL) can be a good pump of FRA. The coupling coefficient between FRL and the transmission fiber is very small, so the pump and the amplifier can be compatible easily.
而光纤拉曼激光器(RFL)又作为FRA的泵浦源，它与光纤的耦合损耗小，可以实现泵浦与放大的良好兼容。
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