通过在基于碳纳米管的掺铒锁模光纤激光器中加入啁啾光纤光栅,实现了皮秒和飞秒孤子的可切换多波长锁模脉冲输出。通过调节偏振控制器,分别在1530.8,1549.5,1556.5 nm三个波长处实现了多波长可切换锁模脉冲输出,其中锁模脉冲的宽度分别为833 fs,7.43 ps和899 fs。以上三个波长的形成是由掺铒光纤的增益谱和啁啾光纤光栅的滤波效应共同决定的。本研究为实现多波长、不同规格脉冲宽度锁模激光器的设计提供了参考。

In this paper, we achieved the output of switchable multi-wavelength mode-locked pulses delivering picosecond and femtosecond solitons simultaneously by means of adding a chirped fiber Bragg grating (CFBG) into an erbium-doped mode-locked fiber laser based on carbon nanotubes. By adjusting a polarization controller, we output the switchable multi-wavelength mode-locked pulses near 1530.8 nm, 1549.5 nm, and 1556.5 nm, with the pulse duration of 833 fs, 7.43 ps, and 899 fs, respectively. In addition, the formation of the above three wavelengths could be jointly attributed to the gain spectra of the erbium-doped fibers and the filtering effect of CFBG. In conclusion, the study provides a reference for designing the multi-wavelength mode-locked fiber lasers with different pulse duration.