Abstract
Low-loss, polarization-maintaining, all-fiber ring resonators can exhibit nonlinear propagation effects occurring at relatively low input powers. Observations have been made of stimulated Brillouin scattering with input powers of 65 microW that lead to significant nonlinear variations in the measured value of finesse owing to depletion of the power through the stimulated-Brillouin-scattering process. Variations of measured finesse from 320 to 210 have been observed for a variation in input power of 155 microW. The nature of this variation in resonator finesse with input power has been studied and is shown to depend on the level of the input power when the resonator response is optimized.
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