Synchronous radiation hardened fiber optic gyroscope

A synchronous fiber optic gyroscope, comprising:

• a laser light source;
• an optical coupler in optical communication with the laser light source and configured to receive an optical signal from the laser light source;
• an optical modulator in optical communication with the optical coupler;
• a fiber optic coil in optical communication with the optical modulator;
• a photodetector configured to receive an optical signal from the optical coupler and convert the optical signal to an electrical signal;
• a loop closure signal processor having a first input, a second input and an output, the first input of the loop closure signal processor configured to receive the electrical signal from the photodetector;
• a radiation-hardened phase lock loop having an input and an output, the output of the phase lock loop operatively connected to the second input of the loop closure signal processor;
• and
• a radiation-hardened direct digital synthesizer operatively coupled to the input of the phase lock loop, the direct digital synthesizer configured to generate a low-frequency signal that is transmitted to the phase lock loop;
• wherein the phase lock loop converts the low-frequency signal to a high-frequency signal that is transmitted to the second input of the loop closure signal processor, and the phase lock loop provides signal modulation that is synchronous with signal demodulation.