A multi-wavelength Brillouin-Raman random fiber laser (BRRFL) with wavelength spacing of double Brillouin frequency shift (BFS) has been proposed for the first time, to the best of our knowledge. This BRRFL has an extremely simple full-open cavity configuration made up of only one roll of fiber, where bidirectional stimulated Raman/Brillouin scattering (SRS/SBS) and Rayleigh scattering based random distributed feedback coexist. In order to further enhance the performance of the BRRFL, a combination of erbium-doped fiber amplifier and single-mode fiber is incorporated into one side for random lasing regeneration. Both the side-mode suppression ratio (SSR) and order number of generated Brillouin Stokes lines (BSLs) show some improvements. A total of 66 BSLs with double BFS spacing has been obtained. Furthermore, the demonstrated laser system offers a wide tunable range with excellent flatness of spectral envelope. The proposed laser featuring simple structure and double BFS spacing would enable promising potentials in optical communication and sensing systems.

中文翻译：

---

双布里渊频率间隔全开腔多波长随机光纤激光器

据我们所知，首次提出了一种波长间隔为双布里渊频移 (BFS) 的多波长布里渊-拉曼随机光纤激光器 (BRRFL)。该 BRRFL 具有极其简单的全开腔结构，仅由一卷光纤组成，双向受激拉曼/布里渊散射 (SRS/SBS) 和基于瑞利散射的随机分布反馈共存。为了进一步提高BRRFL的性能，将掺铒光纤放大器和单模光纤组合在一侧进行随机激光再生。边模抑制比 (SSR) 和生成的布里渊斯托克斯线 (BSL) 的阶数都显示出一些改进。总共获得了 66 个具有双 BFS 间距的 BSL。此外，所展示的激光系统提供了一个广泛的可调范围，具有出色的光谱包络平坦度。所提出的具有简单结构和双 BFS 间距的激光器将在光通信和传感系统中具有广阔的潜力。