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利用非线性偏振旋转(NPR)效应,对被动锁模掺Er光纤激光器同时输出双波带、双孤子的现象进行了实验研究和理论分析。结果发现,激光腔内存在高的线性双折射是得到双波带、双孤子输出的关键条件,提供宽的增益带宽和较大的增益有利于得到稳定的锁模输出。通过在腔内引入较大的线性双折射,在基于NPR锁模技术的被动锁模掺Er光纤激光器中得到了重复频率为7.49 MHz、中心波长分别在1 542 nm和1 557 nm附近的双波带、双孤子锁模脉冲的同时输出。
The nonlinear polarization rotation (NPR) effect is used to experimentally analyze and theoretically analyze the dual mode and dual soliton modes of a passive mode-locked Er-doped fiber laser. The results show that the existence of high linear birefringence in the laser cavity is the key to obtain dual-band and dual-soliton output. The wide gain bandwidth and large gain are favorable for stable mode-locked output. By introducing a large linear birefringence in the cavity, a double-wave with a repetition frequency of 7.49 MHz and a center wavelength near 1 542 nm and 1 557 nm was obtained in a passively mode-locked Er-doped fiber laser based on NPR mode-locking technique. With double soliton mode pulse output at the same time.