A method of forming dual lumen fp laser interferometer based polarization maintaining fiber frequency shift detection method and apparatus

The present invention discloses a laser frequency shift detection method and apparatus for forming a dual lumen F-P interferometer based polarization maintaining fiber, comprising a laser, acousto-optic modulator the AOM, the EDFA fiber amplifier, a quarter wave plate, a collimator , a telescope, a first polarization maintaining fiber, a first circulator, the first narrowband fiber Bragg grating FBG, the PC polarization controller, an optical fiber F-P interferometer, interferometer F-P controller, a polarization beam splitter PBS, a first SPCM single-photon detector, a second single-photon detector SPCM, the second PM fiber, the second circulator, the second narrowband fiber Bragg grating FBG, and the third single-photon detector SPCM capture card. The present inventors have developed an optical fiber laser radar transmitters and two receivers integrated single light path, the two optical fiber splice received within the same coating, a so-called double-D involution optical fiber, realizes the separation of energy detection and frequency shift detection, improved SNR detection of frequency shift using only a single channel interferometer F-P on the successful implementation of the dual-edge technique, high energy efficiency, the method is simple.