Wavelength-tunable laser source

The invention relates to a wavelength-tunable laser source which comprises a laser device drive current source and temperature control circuit, a Fabry-Perot laser device, a light output end connection polarization controller, a 2*2 fiber coupler, an erbium-doped fiber amplifier, a fiber Fabry-Perot tunable filter and an opto-isolator, wherein the input end of the Fabry-Perot laser device is connected with the output end of the laser device drive current source and temperature control circuit; one end of the light output end connection polarization controller is connected with the output end of the Fabry-Perot laser device; the end a of the 2*2 fiber coupler is connected with the other end of the light output end connection polarization controller, and the end b of the 2*2 fiber coupler is used as the output port; the input end of the erbium-doped fiber amplifier is connected with the end c of the 2*2 fiber coupler; one end of the fiber Fabry-Perot tunable filter is connected with the output end of the erbium-doped fiber amplifier; the input end of the opto-isolator is connected with the other end of the erbium-doped fiber amplifier; and the output end of the opto-isolator is connected with the end d of the 2*2 fiber coupler.