一种超窄线宽双向反馈的多波长布里渊光纤激光器

Multi-wavelength Brillouin Fiber Laser with Ultra-narrow Line-width Bidirectional Feedback

提出一种超窄线宽双向反馈的多波长布里渊光纤激光器。一个2×2的3 dB耦合器连接10 km的普通的单模光纤(SMF)作为布里渊增益环,分布反馈式半导体激光器作为布里渊抽运源,两个光环行器实现多波长激光的输出和反馈,没有加入掺铒光纤线性增益结构。当布里渊功率为80 mW时,在10 km单模光纤中产生受激布里渊散射效应,而获得反向传输的多阶斯托克斯光。不包括抽运光,共观察到12个波长的斯托克斯光输出,波长间隔为0.088 nm,输出激光线宽达300 kHz。

A multi-wavelength Brillouin fiber laser with ultra-narrow line-width bidirectional feedback is intro-duced. A 10 km long single-mode fiber （SMF） connected with a 2 × 2 3 dB coupler is used as the Brillouin gain ring and a distributed feedback （DFB） semiconductor laser is taken as the Brillouin pump （BP）. The output and feedback of multi-wavelength lasers are realized by two optical circulators without adding erbium-doped fiber linear gain structure. At the Brillouin pump power of 80 mW, stimulated Brillouin scattering is produced in 10 km long single-mode fiber （SMF）. Therefore, multi-order Stokes reflection lights can be obtained. Stokes light output of 12 wavelengths with 0.088 nm wavelength spacing and 300 kHz output laser line width is observed except BP.