基于高双折射Sagnac环的可调环形腔掺铒光纤激光器理论与实验研究

报道了一种利用偏振控制器（PC）和保偏光纤（PMF）组成的高双折射Sagnac干涉环实现选频和调谐的环形腔掺铒光纤激光器.理论模拟了PMF和PC对波长的控制作用.实验中调节PC得到了单波长、双波长和多波长激光；并验证了滤波间隔随PMF长度的变化规律.实验中得到了斜率效率20%，3 dB线宽0.016 nm，30 dB线宽0.097 nm，边模抑制比（SMSR）40 dB左右的稳定激光输出. 关键词： 光纤激光器 Sagnac干涉环 环形腔 掺铒光纤

Research on tunable erbium-doped ring fiber laser based on a high-birefringence Sagnac loop: theory and experiment

A simple erbium-doped ring fiber laser based on a high-birefringence Sagnac loop filter is proposed. The Sagnac is composed of a polarization controller (PC) and a polarization-maintaining fiber (PMF). The effect of PC and PMF on tunable laser is analyzed in theory. In experiment, the single, double and multiple wavelength lasers are obtained by adjusting the PC. The interval of wavelength varies with the length of PMF. The experimental results are in good agreement with the theoretical analysis. In experiment the stable laser output with 20% slope efficiency, 0.016 nm 3 dB line-width, 0.097 nm 30 dB line-width and 40 dB SMSR was obtained.