Resonant type fiber-optic gyroscope frequency locking device

The invention discloses a resonant type fiber-optic gyroscope frequency locking device.The resonant type fiber-optic gyroscope frequency locking device comprises a light source driving module, a narrow linewidth laser source, a Y waveguide modulator, a first modulation module, a polarization maintaining optical fiber resonant cavity, a signal demodulation detection module, a second modulation module, a digital output module and a lithium niobate straight waveguide modulator.A laser works at constant temperature and constant current and in a steady state, frequency stability is good, and frequency noise introduced by frequency modulation of the laser is effectively lowered.Different from a traditional PZT intra-cavity modulation method, no movable part is arranged in the cavity, the effective refractive index is modulated by modulating the magnitude and direction of an electric field applied to lithium niobate waveguides, equivalent cavity length modulation is achieved, and reliability is high.The modulation v