Kerr effect in all-fiber cavities of optical gyros.

The transmission spectrum of an all-fiber cavity is theoretically analyzed, in order to evaluate the perturbation induced in the eigenfrequency measurement by the Kerr effect. Existence of a threshold separating the bistable operation region from the monostable is shown. In the weakly nonlinear operation, the asymmetry of the line is evaluated and the resulting error in the frequency measurement is analytically derived.