设计了一种无反馈全开腔双倍间隔布里渊-喇曼光纤激光器.采用C+L波段可调谐激光器作为布里渊泵浦, 中心波长为1 455 nm的激光二极管作为喇曼泵浦, 7 km色散补偿光纤作为增益介质.受激布里渊散射和喇曼放大在色散补偿光纤中同时产生, 奇数阶和偶数阶斯托克斯光分别从色散补偿光纤两端输出.该结构减少了多个器件造成的插入损耗.最多可得到186个波长数, 调谐范围为28.6 nm, 波长间隔为0.154 nm.加入一段4 m掺铒光纤优化后可将边模抑制比从14 dB提高至20 dB.

An all-opened double-spacing Brillouin-Raman fiber laser was investigated. A C+L band tunable laser was used as Brillouin pump, a laser diode with 1 455 nm center wavelength was used as Raman pump and 7 km dispersion compensation fiber was used as gain medium. Stimulated Brillouin scattering and Raman amplification were generated in the dispersion compensation fiber simultaneously and the odd-order and even-order Stokes light were obtained at the two ends of the dispersion compensation fiber respectively. The proposed configuration can reduce the insertion loss caused by multiple devices. The largest number of output channels is 186, the tuning range is 28.6 nm and the channel spacing is 0.154 nm. The side mode suppression ratio is enhanced from 14 dB to 20 dB by joining a segment of 4 m Erbium-doped fiber.