利用Giles模型建立双波长环形腔掺铒光纤激光器模型,根据增益损耗匹配条件对1550 nm与1555 nm双波长的模式竞争进行了仿真。结果表明,在均匀增益加宽模型下,损耗谱的微小变化对激光的模式竞争过程有较大影响。当两模式各自的损耗与增益相匹配时,它们的输出功率相当; 但0.1 dB的随机损耗波动将导致两个模式输出功率的相对波动幅度分别达到9.59％和9.52％。当损耗长时间偏离匹配状态0.05 dB时,一个模式将逐渐减弱并最终湮灭,另一个模式得到增强。

A numerical model of a dual-wavelength erbium-doped fiber ring laser is presented based on the Giles' model. According to the gain and loss match condition, the mode competition of dual-wavelength of 1550 nm and 1555 nm is analyzed. Numerical results show that even tiny changes in loss spectrum have great impact on the process of mode competition. Output powers of dual wavelength are equal when loss maches gain. However, random loss perturbation of 0.1 dB will result in the relative output power fluctuations of 1550 nm and 1555 nm up to 9.59% and 9.52%, respectively. One mode is enhanced and the other is eliminated when a long-term loss bias is larger than 0.05 dB.