All-fiber dual-frequency laser system based on optical phase-locked loop and construction method thereof

The invention discloses an all-fiber double-frequency laser system based on an optical phase-locked loop and a construction method thereof, and the method comprises the steps: outputting two groups of single-frequency lasers, obtaining 10% of light from the two groups of single-frequency lasers through an output channel of a polarization-maintaining optical fiber beam splitter, and inputting the light into a polarization-maintaining optical fiber beam combiner to obtain beam-combined light; inputting the combined light into a 45-degree polarization-maintaining optical fiber polarizer, outputting the combined light, enabling the combined light to pass through the polarization-maintaining optical fiber polarizer, and generating light interference to obtain a beat frequency signal; inputting the beat frequency signal into an optical phase-locked loop control system to generate a locking control signal; and the double-frequency laser is used for inputting the locking control signal into a frequency control end of