讨论了分布式光纤拉曼增益放大器的工作原理，采用1320nm固体激光器作为抽运源，获得了1410nm波段附近的光放大，在单模GI光纤长度为23km时，初步研究了拉曼放大器增益与光纤作用长度的关系，抽运脉冲峰值功率分别为50W、30W时，光纤的有效作用长度分别为15.5km和10.5km；研究了在不同的光纤有效作用长度时，拉曼放大器增益与抽运功率的关系；从光纤拉曼光谱图估算了光纤拉曼放大器的光谱宽度为50nm或250cm-1。

The operation principle of distributed fiber Raman gain amplifier is discussed. The light amplification was obtained at 1410 nm wavelength region by using a 1320 nm solid laser as pumping source and a 23 km single mode GI optical fiber. The relation between the gain of fiber Raman amplifier and the effective interaction length of optical fiber is studied. When the pump peak power is 50 W and 30 W, the effective interaction length is 15.5 km and 10.5 km. The relation between the gain of Raman amplifier and pump power at different effective interaction length of optical fiber is anlyzed. The spectrum width of Raman fiber amplifier is estimated to be 50 nm or 250 cm from the Raman backscattering spectrum of optical fiber.