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为了分析掺铒光纤激光器的非线性动力学特性,扩大产生混沌的参数范围,实验研究了采用2个正弦信号驱动的损耗调制型掺铒光纤环形激光器。该激光器在不同的调制参数条件下可产生锁频与混沌现象;随调制电压的增加,在锁频处通过倍周期分岔进入混沌;在非锁频处通过准周期进入混沌。实验发现频率比不同时由准周期转变为混沌所需调制电压不同,频率比等于黄金分割数时所需调制电压最低。在频率比保持不变时,该激光器可在不同调制电压比时产生混沌。结果表明:该激光器具有复杂的非线性动力学行为和更大的混沌参数空间。
In order to analyze the nonlinear dynamic characteristics of erbium-doped fiber laser and expand the parameter range of chaos generation, we experimentally study the loss-modulated erbium-doped fiber ring laser driven by two sinusoidal signals. The laser can generate the frequency locking and chaos under different modulation parameters. With the increase of the modulation voltage, it enters the chaos through the doubling period bifurcation at the frequency locking, and enters the chaos through the quasi-period at the non-frequency locking. The experimental results show that the modulation voltage is different from the modulation voltage when the frequency changes from quasiperiodic to chaotic, and the modulation voltage is the lowest when the frequency is equal to the golden number. The laser can chaos at different modulation voltage ratios at a constant frequency ratio. The results show that the laser has complex nonlinear dynamics and larger space of chaotic parameters.