A switchable multi-wavelength Brillouin-Raman fiber laser (MW-BRFL) is presented in this work. The MW-BRFL consists of a full-open linear cavity in which dispersion compensating fiber is employed as the gain medium for Brillouin and Raman amplification. The switching operation for single- and double-wavelength spacing MW-BRFL can be implemented by controlling Brillouin pump (BP) power distribution and direction that enters the laser cavity via two fiber-entry points. This is achievable by optimizing the splitting ratio of an optical coupler and the initial BP power. For the proposed laser setup, a 30/70 optical coupler was found to be the optimum. By setting the initial BP power at −3.0 dBm, 246 laser lines with 20-GHz frequency spacing were observed. The transformation to 10-GHz frequency spacing was attained by increasing the BP power to 11.8 dBm that resulted in 483 laser lines. All the counted laser lines had 3 dB peak power variation and were spread across a 38 nm bandwidth. In a nutshell, the proposed MW-BRFL is promising with respect to its performance, simplicity and flexibility.

这项工作提出了一种可切换的多波长布里渊拉曼光纤激光器（MW-BRFL）。MW-BRFL由一个全开式线性腔组成，其中色散补偿光纤用作布里渊和拉曼放大的增益介质。单波长和双波长间隔MW-BRFL的开关操作可以通过控制布里渊泵（BP）的功率分布和通过两个光纤进入点进入激光腔的方向来实现。这可以通过优化光耦合器的分光比和初始BP功率来实现。对于建议的激光器设置，发现30/70光耦合器是最佳选择。通过将初始BP功率设置为-3.0 dBm，观察到246条频率间隔为20 GHz的激光线。通过将BP功率提高到11，可以实现向10 GHz频率间隔的转换。8 dBm产生了483条激光线。所有计数的激光线均具有3 dB的峰值功率变化，并散布在38 nm带宽上。简而言之，拟议的MW-BRFL就其性能，简单性和灵活性而言是很有前途的。