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In this paper, we report on stable dual-wavelength operation of a thulium-doped compact all-fiber laser using a double-ring filter as the wavelength selective element. Simultaneously lasing at 2014.4 and 2018.4 nm has been obtained via tuning the polarization controllers to adjust the relative gain and loss of the laser cavity. The side mode suppression ratios are greater than 52 dB and the output power difference between the two lasing lines is less than 0.08 dB under 2.6 W of incident pump power.

We report the results of numerical simulations on pump hysteresis and bistability of a dissipative soliton fiber laser. The fiber laser is made of normal-dispersion fibers and passively mode locked by using the nonlinear polarization rotation technique. The dependence of the final steady state on the initial light field is investigated. Bistability between the single-pulse state and the double-pulse state in the mode-locking regime is demonstrated. Different initial conditions could lead to different attractors, even with the same point in the parameter space.