Theoretical analysis of feedback high birefringence fiber loop mirror with dramatically enhanced free spectral range

Abstract

A feedback high birefringence fiber loop mirror is proposed and theoretically analyzed. Large effective free spectral range can be achieved by the intrinsic vernier effect between the fast and slow axes in the high birefringence fiber, which is independent of the input signal polarization.Keywords: fiber loop mirror, high birefringence fiber, free spectral range, vernier effect