Difference in Finesse Between Output and Circulating Intensities in Optical Fibre Ring and Loop Resonators

Abstract

When the geometry of an optical fibre ring or loop resonator with two or more fibre couplers is complex, the shapes and linewidths of the resonance curves of the output intensities and the circulating (resonant) intensities, and consequently their finesses, may become different. Applying degenerate two-wave mixing to some configurations of these fibre ring or loop resonators can also bring about a noticeable difference between these finesses. A theoretical study of this aspect is presented. Results obtained from this study can improve our understanding of the basic characteristics of these fibre resonators.