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在背向抽运的光纤拉曼放大器(FRA)中,能够观察到级联的受激布里渊散射(SBS)。在SBS实验中,采用最大输出功率为3000 mW的三波长光纤拉曼激光器作为拉曼抽运源,25 km单模光纤(SMF)作为布里渊增益和拉曼增益介质,功率为3 dBm的外腔式激光器(ECL)作为布里渊抽运源。在实验中观察到的前、后向级联SBS的最高级数分别为156条和89条,前、后向SBS相邻级次光谱之间的频移分别为11 GHz和22 GHz,即它们波长间隔分别为0.085 nm和0.166 nm,光谱带宽分别为13.580 nm和14.812 nm。与前向传输相比,后向输出的平坦性要好。与单波长FRA相比,用三波长拉曼激光器作为抽运源更容易得到平坦性好和阶数更多的级联SBS。
In a pump-back fiber Raman amplifier (FRA), cascaded stimulated Brillouin scattering (SBS) can be observed. In the SBS experiment, a three-wavelength fiber Raman laser with a maximum output power of 3000 mW was used as a Raman pumping source and a 25 km single-mode fiber (SMF) was used as a Brillouin gain and Raman gain medium with a power of 3 dBm External Cavity Lasers (ECLs) serve as the Brillouin pumping source. The maximum numbers of anterior and posterior cascaded SBS observed in the experiments were 156 and 89, respectively. The frequency shifts between the adjacent SBS adjacent orders were 11 GHz and 22 GHz, respectively The wavelength intervals are 0.085 nm and 0.166 nm, respectively, and the spectral bandwidths are 13.580 nm and 14.812 nm, respectively. The flatness of the backward output is better than the forward transfer. Compared with the single-wavelength FRA, it is easier to obtain a cascaded SBS with good flatness and order by using the three-wavelength Raman laser as the pumping source.