Application of Parallel-Coupled Ring Resonators in Optical Resonance Gyroscopes with Low-Coherent Radiation Sources

The most promising class of optical gyroscope from the miniaturization point of view is the resonant optical gyroscope with a low-coherence radiation source. The present study briefly discusses the principles of operation of the main types of such resonators. One of the most significant drawbacks of the resonant optical gyroscope with a low-coherence radiation source is its low energy efficiency. Only a small portion of the radiation carrying information about the angular velocity is directed from the source to the photodetector, specifically the radiation at frequencies corresponding to the eigenfrequencies of the ring resonator, the rest of the radiation being scattered on the unused ports of the resonator and converted into heat. It has been shown that the use of parallel-connected ring resonators can increase the energy efficiency of resonant gyroscopes with low-coherence radiation sources by an order of magnitude, from a few percent to tens of percent. It has also been theoretically demonstrated that this can reduce the contribution of shot noise and thermal noise of the photodiode by several times and increase the sensitivity of the gyroscope.