We present a theoretical study of multiple bistability in an optical-fiber double-ring resonator. The multiple bistability is caused by the optical Kerr effect, which modulates the refractive index of the fiber. The dependence of the multiple bistability on various parameters of the fibers and the couplers is investigated.>
A special property of a type 3 optical fiber ring resonator with a 3 × 3 planar coupler in which the circulating intensity is independent of the phase change of the ring resonator can be used to eliminate unwanted Kerr bistability. At the same time the device can be used as a two-channel frequency division multiplexer or demultiplexer or a switch. Another method for the elimination of Kerr bistability is the use of two fibers whose nonlinear refractive-index coefficients have opposite signs to build the ring resonator.
Based on the mechanism of Kerr effect in Brillouin Fiber-optic Ring Resonator(BFRR),the resonant cavity characteristic is researched theoretically when considering the Kerr effect,in order to get the possibility of occurrence of first-order Stokes light optical bistability. Experiments show that the optical bistability in 30 meters short cavity happens while input light intensity is about 440 μW,and the bistability is related with coupling coefficient and the insertion loss of the cavity coupler. Secondly,the Kerr effect in BFRR of Brillouin Fiber-optic Gyroscope (BFOG) is analyzed,focusing on the influence of resonant deviation on gyroscope nonlinear output and dynamic working range. Furthermore,the double-loop BFOG program is proposed,which provides a potential solution of Kerr effect error in Brillouin fiber-optic gyroscope.