Switchable single-polarization dual-wavelength TDFL using PM Fabry–Perot filter

Abstract

Abstract A switchable single-polarization (SP), dual-wavelength thulium-doped fiber laser using polarization maintaining (PM) Fabry–Perot (F–P) filter is proposed. A combination of the PM F–P filter, a polarization controller (PC) and a polarizer is used to ensure the SP lasing operation. A stable dual-wavelength lasing operation is obtained at 1941.82 nm and 1942.21 nm. By adjusting the PCs, the proposed laser can achieve SP single-wavelength lasing operation; the polarization extinction ratios are higher than 33 dB. When the pump power is higher than 2.98 W, the optical signal-to-noise ratios of the SP single-wavelength operation can reach 60 dB, and the output power variations are less than 0.32 dB ( X -polarization) and 0.30 dB ( Y -polarization). The slope efficiencies of SP lasing operation are 6.26% ( X -polarization) and 8.79% ( Y -polarization), respectively.