中文摘要：

研制了一种基于保偏（PM）光纤可饱和吸收体结合光纤光栅Fabry-Perot（FBG F-P）标准具的单频窄线宽光纤激光器。该激光器以高增益掺Er3＋光纤（EDF）作为增益介质,采用行波环形腔消除空间烧空效应,并结合FBG F-P标准具选模,实现激光器单频运转。用一段PM EDF作为可饱和吸收体抑制跳模,以获得高效、稳定的1 550.65 nm单频激光输出。在975 nm单模泵浦激光抽运下,当抽运光功率为148 mW时,获得的最大信号光功率为46.3 mW,相应的光-光转换效率为31.3%,斜率效率为32.6%,信噪比（SNR）大于55 dB。使用40km单模光纤（SMF）延迟线,根据延时自外差方法测量得到单频激光器的3 dB光谱线宽约为2.5 kHz。

英文摘要：

A single-frequency narrow-linewidth fiber laser is presented,which is based on polarization maintaining（PM） fiber saturable absorber and fiber Bragg grating Fabry-Perot（FBG F-P） etalon.The high-gain Er3＋ doped fiber was used as the gain medium,the traveling-wave cavity was selected to eliminate the spatial hole burning effect,and the FBG FP etalon was utilized to select longitudinal laser modes,so the single-frequency operation was achieved.A segment of Er3＋-doped PM fiber acts as the saturabel absorber to suppress mode hopping to acquire high-efficiency and stable single frequency laser at 1 550.65 nm.Under 975 nm single-mode laser diode（LD） pump,when the pump power is 148 mW,the output power is 46.3 mW,the corresponding optical-optical efficiency is 31.3%,the slope efficiency is 32.6% and the signal-to-noise ratio（SNR） is greater than 55 dB.The 3 dB linewidth of the fiber laser is about 2.5 kHz,which is measured by the delayed self-heterodyne method with a 40 km single mode fiber.