All-Fiber Wavelength-Tunable Narrow-Linewidth Polarization-Maintaining Tm-Doped Fiber MOPA System

An all-fiber wavelength-tunable narrow-linewidth polarization-maintaining (PM) Tm-doped fiber master oscillator power amplifier (MOPA) system is presented. We demonstrate an ring cavity master-oscillator (MO) with a tuning range of 110 nm (from 1925 to 2034 nm). The maximum output 459 mW obtained at 1992.9 for 16 W launched pump 793 nm, corresponding slope efficiency 5.6% concerning power. By using one-stage combined high gain >10 dB, the 12.6% and 5.65 1993 nm. 3 dB linewidth less than 0.5 M2 ≈ 1.25, polarization extinction ratio (PER) reaches 21.4 dB. influence different active lengths on laser amplification also studied.