All-Polarization Maintaining Noise-Like Pulse From Mode-Locked Thulium-Doped Fiber Laser Based on Nonlinear Loop Mirror

All-Polarization Maintaining Noise-Like Pulse From Mode-Locked Thulium-Doped Fiber Laser Based on Nonlinear Loop Mirror

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In this paper, we present a figure-eight all-polarization maintaining thulium-doped mode-locked fiber laser based on a nonlinear optical loop mirror operating at noise-like pulse regimes.The total cavity length is 34.5 m, and the calculated net group delay dispersion is estimated to be ∼−2.616 ps2.At the maximum pump power, stable noise-like pulse centered at 1943 nm with a spectral Air Filter full width at half maximum of 32 nm, a pulse energy of 13.

51 nJ, and a coherence spike width of 236 fs is generated at a repetition rate of 5.96 MHz with the signal-to-noise ratio ∼64 dB.The polarization extinction ratio is > 15 dB at any mode-locking operation.The slope efficiency Western Show Saddles and the output power fluctuation of the laser are 5.16% and 0.

039%, respectively.The laser does not require polarization state controllers, and it holds very high stability, which is insensitive to temperature changes or mechanical vibrations.Through further amplification, it will be a good laser source for real-time interrogation of fiber Bragg gratings and supercontinuum generation.