提出了一种全光纤偏振输出锁模光纤激光器。在谐振腔内无滤波器件时,利用光纤偏振分束器的偏振输出和光纤的双折射偏振滤波效应在全正色散域获得稳定的锁模脉冲序列,脉冲重复频率为2.2 MHz,单脉冲能量达100nJ。利用级联偏振控制器调节腔内偏振状态,获得了单波长和双波长锁模输出,在1μm波段观测到了稳定的暗孤子脉冲,腔内偏振态的演变是获得不同锁模状态的关键性因素。双波长锁模输出状态下的波长可调谐宽度达12nm,利用系统透过率函数理论分析了利用腔内偏振调节实现波长调谐的原理。 An all-fiber polarization output mode-locked fiber laser is proposed. In the resonator without filtering device, the use of fiber polarization beam splitter polarizing output and fiber birefringence polarization filtering effect in the all-positive dispersion domain to obtain a stable mode-locked pulse sequence, the pulse repetition frequency of 2.2 MHz, single pulse energy up to 100nJ. The cascaded polarization controller was used to adjust the polarization state of the cavity. Single-wavelength and dual-wavelength mode-locked outputs were obtained. Stable dark soliton pulses were observed in the 1 μm band. The evolution of the polarization state in the cavity was the key factor for obtaining different mode-locked states . The wavelength tunable width of the dual-wavelength mode-locked output state is up to 12 nm, and the principle of wavelength tuning using intra-cavity polarization adjustment is analyzed by using the system transmittance function theory.