System to reduce gyroscopic errors with limited power supply quality in a fiber optic gyroscope

A fiber optic gyroscope, comprising:

• an optical coupler in optical communication with and configured to receive an optical signal from a light source;
• an optical modulator in optical communication with the optical coupler;
• a fiber optic coil in optical communication with the optical modulator;
• a demodulator configured to receive an optical signal from the optical coupler and convert the optical signal to an electrical signal;
• a bias modulator configured to output a modulation signal to the optical modulator;
• at least one main power supply;
• a demodulator local power supply operatively coupled to a first shunt regulator, wherein the demodulator local power supply feeds the first shunt regulator with a current source to operatively couple the main power supply to the demodulator;
• and
• a modulator local power supply operatively coupled to a second shunt regulator, wherein the modulator local power supply feeds the second shunt regulator with a current source to operatively couple the main power supply to the bias modulator.