Patent ID: 8274659

Claim:
A resonator fiber optic gyroscope, comprising: a resonator optical ring cavity; a first light source in optical communication with the ring cavity and configured to generate a clockwise optical signal that is transmitted to the ring cavity; a second light source in optical communication with the ring cavity and configured to generate a counter-clockwise optical signal that is transmitted to the ring cavity; a first optical isolator in optical communication with the first light source and the ring cavity, the first optical isolator configured to prevent the clockwise optical signal from being back-reflected to the first light source; a second optical isolator in optical communication with the second light source and the ring cavity, the second optical isolator configured to prevent the counter-clockwise optical signal from being back-reflected to the second light source; a first optical detector optically coupled to the ring cavity; a second optical detector optically coupled to the ring cavity; a third optical isolator optically coupled between the ring cavity and the first optical detector, the third optical isolator configured to prevent the clockwise optical signal from being back-reflected to the ring cavity; and a fourth optical isolator optically coupled between the ring cavity the second optical detector, the fourth optical isolator configured to prevent the counter-clockwise optical signal from being back-reflected to the ring cavity.