提出并实现了一种单纵模窄线宽输出、波长可开关的光纤激光器。该激光器采用环形腔结构, 利用一段未抽运的掺铒光纤(EDF)的饱和吸收效应来实现光纤激光器的单纵模运转与窄线宽输出; 同时利用1×2光开关和2个并联的不同中心波长的光纤光栅(FBG)的选波作用, 通过控制光开关的电压信号, 实现2个输出波长的可开关功能。在17.5 dBm的掺铒光纤放大器(EDFA)输出功率下, 获得了2.5 dBm峰值功率,3 kHz线宽的单纵模激光输出; 并且输出光的波长在控制电压的作用下可在1545.2 nm和1556.4 nm两个波长之间任意选择。

A new kind of single-longitudinal-mode and wavelength-switchable fiber laser is proposed and experimentally demonstrated. Such a fiber laser has a ring resonant cavity. An unpumped erbium-doped fiber (EDF) in the cavity is used as the saturable absorber to achieve single-longitudinal-mode operation. An 1×2 optical switch and 2 parallel fiber Bragg gratings (FBGs) are used as the wavelength selection module to achieve wavelength-switchable operation. At 17.5-dBm output power of EDF amplifer, the single-longitudinal-mode laser with 2.5-dBm power and 3-kHz linewidth is generated. The wavelength is randomly switched between 1545.2 nm and 1556.4 nm by applying the suitable electrical signal to optical switch.