Patent ID: 8077322

Claim:
A resonator fiber optic gyroscope, comprising: a first light source configured to generate a first light signal; a resonator element coupled to the light source and configured to generate a first optical signal based on the first light signal; a first photodetector coupled to the resonator element and configured to generate a first electrical signal based on the first optical signal, the first electrical signal including an oscillating signal, a first direct-current (DC) signal, a first even-harmonic signal comprising components at even harmonics of the oscillating signal, and a first odd-harmonic signal comprising components at odd harmonics of the oscillating signal; a first filtering element coupled to the first photodetector and configured to attenuate the first DC signal, at least one even-harmonic component of the first even-harmonic signal, and a first odd-harmonic component of the first odd-harmonic signal to produce a second electrical signal; a first amplifier coupled to the filtering element and configured to amplify the second electrical signal; and a first analog-to-digital converter (ADC) coupled to the amplifier and configured to digitize the amplified second electrical signal.