Self-beating resonant optical gyroscope with a "reflector": the possibility of high sensitivities at reduced costs

Using simulations and theoretical analysis, we present an innovative readout technique that uses the change in a beat frequency signal for sensing rotation in the resonant fiber gyroscope with a "reflector." Unlike traditional fiber optic gyros, this gyroscope uses an embedded reflecting element that deliberately couples the clockwise and counter-clockwise propagating waves for sensing rotation. Our analytical results predict increased immunity to the degrading effects of backscattering, Kerr nonlinearities, and ambient variations at an optimum nonreciprocal bias. Using just a few meters of fiber and without requiring a very narrow-linewidth source, sensitivities below 1 deg/h along with a dynamic range greater than 10⁶ deg/h are predicted. The technique has the potential to provide a cost-effective solution in the tactical grade.