基于色散不对称光纤环形镜的锁模光纤激光器

在理论上数值计算了各种常量对色散不对称非线性光纤环形镜透射特性的影响。并分析了它作为被动锁模器件用于光纤激光器压窄脉冲的物理机制。利用8字形主被动混合锁模的结构在调制频率为9．998748700 GHz，波长为1566．65nm处获得了11ps的稳定锁模脉冲输出．对应谱宽0．297nm．同时在重复频率为9．995792825 GHz和9．996778256 GHz时分别得到了振幅均匀的二阶和三阶谐波锁模输出。证明色散不对称非线性光纤环形镜可以有效消减脉冲的尾翼和噪声．得到脉幅稳定的脉冲序列。

Actively-Passively Mode-Locked Erbium-Doped Fiber Laser with Dispersion-Imbalanced Nonlinear Optical Loop Mirror

Simulation of the dispersion-imbalanced nonlinear optical loop mirror′s transmission characteristics with different parameters is made. The physical mechanism of using dispersion-imbalanced nonlinear optical loop mirror to compress pulse in mode-locked fiber laser is analyzed theoretically. 11 ps stable mode-locked pulse train at 1566.65 nm with the modulation frequency of 9.998748700 GHz is obtained by using figure-eight actively-passively structure. Meanwhile, 2～3 harmonic mode-locked pulses with uniform amplitude are obtained at the modulation frequency of 9.995792825 GHz and 9.996778256 GHz respectively. It is demonstrated that dispersion-imbalanced nonlinear optical loop mirror can effectively eliminate the wings and noise of pulse to obtained pulse train with uniform amplitude.