A resonator fiber optic gyroscope (100, 200, 300, 400) that reduces rotation rate error instability caused by double back reflections, comprising: a resonator optical ring cavity (102, 202, 302, 402); a first light source (104, 204, 304, 404) 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 (108, 208, 308,408) 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 detector (124, 224, 324, 426) in optical communication with the ring cavity and configured to receive the clockwise optical signal from the ring cavity; a second optical detector (126, 226, 326, 424) in optical communication with the ring cavity and configured to receive the counter-clockwise optical signal from the ring cavity; characterized in further comprising: a first optical component (140, 240, 340, 416) in optical communication with the first light source and the ring cavity, the first optical component configured to prevent the clockwise optical signal from being back-reflected to the first light source; and a second optical component (144, 244, 344, 420) in optical communication with the second light source and the ring cavity, the second optical component configured to prevent the counter-clockwise optical signal from being back-reflected to the second light source. a resonator optical ring cavity (102, 202, 302, 402); a first light source (104, 204, 304, 404) 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 (108, 208, 308,408) 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 detector (124, 224, 324, 426) in optical communication with the ring cavity and configured to receive the clockwise optical signal from the ring cavity; a second optical detector (126, 226, 326, 424) in optical communication with the ring cavity and configured to receive the counter-clockwise optical signal from the ring cavity; characterized in further comprising: a first optical component (140, 240, 340, 416) in optical communication with the first light source and the ring cavity, the first optical component configured to prevent the clockwise optical signal from being back-reflected to the first light source; and a second optical component (144, 244, 344, 420) in optical communication with the second light source and the ring cavity, the second optical component configured to prevent the counter-clockwise optical signal from being back-reflected to the second light source. a first optical component (140, 240, 340, 416) in optical communication with the first light source and the ring cavity, the first optical component configured to prevent the clockwise optical signal from being back-reflected to the first light source; and a second optical component (144, 244, 344, 420) in optical communication with the second light source and the ring cavity, the second optical component configured to prevent the counter-clockwise optical signal from being back-reflected to the second light source.