Patent ID: 9389081
Filing Date: 2016-07-12
CPC Classification: G01C,H01S

Claim Text:
1. A resonator fiber optic gyroscope (RFOG), comprising: a master laser configured to emit a reference optical signal; a first slave laser configured to emit a clockwise (CW) optical signal, the first slave laser responsive to the reference optical signal through a CW optical phase lock loop; a second slave laser configured to emit a counter-clockwise (CCW) optical signal, the second slave laser responsive to the reference optical signal through a CCW optical phase lock loop; a reference resonator in optical communication with the master laser and configured to receive the reference optical signal, the reference resonator comprising a first fiber optic coil having a first cavity length; and a gyro resonator in optical communication with the first slave laser and the second slave laser, the gyro resonator configured to receive the CW and CCW optical signals, the gyro resonator comprising a second fiber optic coil having a second cavity length that is longer than the first cavity length of the first fiber optic coil; a first phase modulator comprising a first piezoelectric core wound with a portion of the first fiber optic coil of the reference resonator; a second phase modulator comprising a second piezoelectric core wound with a portion of the second fiber optic coil of the gyro resonator; a CW resonance tracking electronics module operatively coupled to the gyro resonator; and a CCW resonance tracking electronics module operatively coupled to the gyro resonator; wherein the reference resonator is operatively coupled to the CW resonance tracking electronics module to adjust a resonance frequency of the reference resonator to substantially correspond with a resonance frequency of the gyro resonator, such that the reference resonator has an operating frequency that substantially tracks with an operating frequency of the gyro resonator.