运用非线性偏振旋转效应实现了一种掺铥锁模多波长光纤激光器.采用环形腔结构，以1 565 nm半导体光源为泵浦源，3 m长掺铥光纤为增益介质.利用非线性偏振旋转效应进行滤波.当泵浦功率在800 mW时，通过调节光纤偏振控制器，激光器出现了被动锁模状态的脉冲输出，脉冲重复频率为3.178 MHz，脉冲宽度为617 ps.进一步增加泵浦功率，激光器进入多波长输出的工作状态.调节偏振控制器在室温下得到1～5个稳定的波长激光输出，边摸抑制比为40～60 dB.

By using the nonlinear polarization rotation, a thulium doped mode-locked multi wavelength fiber laser was achieved. In the ring cavity, a 1 565 nm fiber laser pumps a 3 m long thulium doped fiber. Filtering is realized by the nonlinear polarization rotation effect.When the pump power is 800mW, the pulse output of the passively mode locked state is realized by adjusting the fiber polarization controller. The pulse repetition frequency is 3.178 MHz and the pulse width is 617 ps.Further increasing the pump power, the laser is working at a multi wavelength state. By adjusting the fiber polarization controller, a stable 1~5 wavelength laser output is obtained at a room temperature, and the edge is less than 40～60 dB.