Patent ID: 9587945
Date: 2017-03-07
CPC Classifications: G01C

Claim:
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 operatively coupled to the master laser and 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 operatively coupled to the master laser and responsive to the reference optical signal through a CCW optical phase lock loop; and an optical resonator ring cavity in optical communication with the first slave laser and the second slave laser, the resonator ring cavity configured to receive the CW optical signal and the CCW optical signal, the resonator ring cavity not optically connected to the master laser such that the resonator ring cavity does not receive the reference optical signal; a feedback laser stabilization loop for the master laser that includes a common modulation frequency scheme, wherein a reflected optical signal from the resonator ring cavity is directed to the feedback laser stabilization loop; wherein a frequency of the reference optical signal from the master laser is indirectly locked onto a resonance frequency of the resonator ring cavity with a fixed frequency offset, which is determined by a relative frequency between the optical signal of the first slave laser or the second slave laser, and the reference optical signal of the master laser.