POLARIZATION ANALYSIS OF BRILLOUIN-SCATTERING IN A CIRCULARLY BIREFRINGENT FIBER RING-RESONATOR

A complete analysis of the eigenstate of polarization (ESOP's) in a Br illouin fiber ring laser using fibers with a high circular birefringen ce is proposed in this paper. Conditions to obtain circular ESOP's for application in a Brillouin fiber optic current sensor are highlighted as well as conditions to have stable ESOP's for applications in other passive or active sensors, Measurements are performed on a Brillouin laser using a mechanically twisted fiber ring resonator confirming the theoretical predictions, Ring resonator configurations using linearly birefringent fibers are compared to configurations using circularly b irefringent fibers.