基于啁啾光纤布拉格光栅（C-FBG）与半导体可饱和吸收镜(SESAM)相结合实现了光纤掺Yb3+线型锁模激光器。采用976 nm半导体激光器，以高掺杂浓度的掺Yb3+光纤作为增益介质，以SESAM作一端的反射镜，以C-FBG引入大的负色散，并作为另一端反射镜，最终获得了稳定皮秒脉冲序列的输出。其中心波长为1045 nm，平均功率为12 mW，基频重复频率为17.07 MHz，脉宽约为3 ps。详细讨论了高阶锁模光脉冲的演化方式。该锁模光纤激光器可以完全自启动，可以长时间稳定工作，有望成为高功率超短脉冲激光器的种子源。

The passively mode-locked all fiber Yb3+-doped linear laser based on the chirped fiber Bragg grating (C-FBG) combined with a semiconductor saturable absorber mirror (SESAM) is achieved. High doping concentration Yb3+-doped fiber is used as the gain medium, which is pumped by a 976 nm diode laser, with a SESAM as one end of the reflector. A C-FBG introduces a large anomalous dispersion, and operates as the other end of the reflector. Finally, a stable picosecond pulse sequence output is achieved with pulse duration of 3 ps at repetition rate of 17.07 MHz. The maximum average power is 12 mW with the center wavelength of 1045 nm. The evolution of higher-order mode-locked optical pulse is dicussed. The mode-locked fiber laser can be self-starting and has a long-time stability, and is expected to become seed sources for high-power ultrashort pulse laser.