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使用掺铒光纤平均反转粒子数模型推导了双波长激光器平衡振荡需满足的条件,并据此设计实验系统,对抽运功率、模式损耗以及波长间隔对输出功率的影响进行了实验研究。结果表明,可通过调节腔内损耗谱实现掺铒光纤环形腔内多波长激光输出,双模平衡振荡条件在远离阈值点情况下成立;可变衰减器的稳定性对双波长平衡的影响极大,允许的偏离值小于0.4 dB;而起振波长的偏离对双波长平衡的影响较小,大于1 nm的波长偏离才会导致平衡破坏;掺铒光纤的非均匀加宽效应允许平衡时损耗在一定范围内波动,这有助于提高激光器的输出稳定性,30 min内1546 nm和1556 nm双波长的功率波动小于0.5 dB。
The condition of balanced oscillations of dual-wavelength lasers is deduced using the average population inversion model of erbium-doped fibers. Experimental system is designed to study the influence of pumping power, mode loss and wavelength spacing on output power. The results show that multi-wavelength laser output in erbium-doped fiber ring cavity can be realized by adjusting the cavity loss spectrum, and the condition of dual-mode equilibrium oscillation is established far away from the threshold point. The stability of variable attenuator has a great influence on the dual-wavelength balance , The allowable deviation value is less than 0.4 dB; while the deviation of the starting wavelength has less influence on the dual wavelength balance, and the wavelength deviation larger than 1 nm will lead to the balance failure; the non-uniform widening effect of the erbium-doped fiber allows the loss in equilibrium at A range of fluctuations, which helps to improve the output stability of the laser, 1546 nm and 1556 nm dual wavelength power fluctuations less than 0.5 dB within 30 min.