All Polarization-Maintaining Fiber Laser for Femtosecond Pulse Generation at NTSC

We report on a robust mode-locked femtosecond fiber laser based on a nonlinear optical mirror with all polarization-maintaining fibers. Stable and self-starting operation is obtained by exploiting an integrated nonreciprocal device biases $\pi$/2 phase shift. In the single-pulse region, the laser directly generates output power of 3.15 mW at repetition rate of 87.7 MHz, corresponding to the pulse energy of 37 pJ. The center wavelength is 1585 nm with the spectral bandwidth of 25 nm at the maximum output power. We also evaluate the relative intensity noise of the mode-locking laser.