Analysis of a fiber-optic LP_01 ↔ LP_02 mode converter

Abstract

We investigate the intermodal coupling between LP(0l) and LP(02) modes for a mode converter fabricated in a few-mode fiber with photorefractive gratings. Our results show that a narrow spectrum of power conversion can be obtained by reducing the index perturbation or by using a large core-cladding index difference and a small fiber core radius.