中文摘要：

应用单级偏振无关的准共线型声光可调谐滤波器为调谐元件，实现了环形腔掺铒光纤激光器的连续可调谐激光输出. 简要阐述了与偏振无关的准共线型声光可调谐滤波器的工作原理，对其频移补偿原理进行了分析. 实验研究得到：当抽运功率为13 mW时，中心波长为1550 nm的激光输出功率为322 μW，阈值抽运功率在7.65 mW左右，斜率效率约为6.02%；并获得了38 nm带宽（1524.7—1562.4 nm）的连续可调谐激光输出.

英文摘要：

A erbium-doped fiber ring laser, which utilizes a single-stage polarization-independent acousto-optic tunable filter by use of quasi-collinear coupling as the tuning component, is proposed and a continuously tunable lasing wavelength is realized. The filtering principle of the polarization-independent quasi-collinear filter is introduced briefly, and then the compensation of frequency-shift is analyzed. The experimental results are that the output power of the laser pumped at 13 mW is measured to be 322 μW at a lasing wavelength of 1550 nm, the threshold pump power is 7.65 mW, and the slope efficiency is 6.02%; the tuning range of 38 nm, starting from 1524.7 nm ending at 1562.4 nm, is observed.