Use of modal interference for probing birefringence induced in a bent optical fiber.
We report a novel method that utilizes two lowest-order modes, HE(11) and TE(01), to probe birefringence induced in a bent circular-core optical fiber. The interference patterns of the two modes are examined by using a polarizer at the fiber output end. The contrast that is extracted from the interference pattern is periodically modulated as a function of phase retardation between the two modes, while the shift of the contrast function shows a strong dependence on the fiber birefringence as the polarizer rotates. Theoretical description followed by the test results demonstrates the feasibility of the method.
Chen
Tien-Jung
TJ
Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, China. tjchen@ntut.edu.tw
Lin
Yi-Hsin
YH