A coupled-mode equation (CME) of twisted birefringent fiber is presented in this paper, which uses the degenerate polarization modes of single-mode fibers as eigenmodes in a unified coordinate. The inconsistency between the coordinate and the rotating principal axis, existing in the previous CME, is solved by conversion to the lab coordinate. The CME gives self-consistent results for fibers with high birefringence or low birefringence and for single-mode fibers as well. Analyses and simulations show the CME gives characteristics of twisted birefringent fiber coincident with the property of polarization-maintaining fibers.
© 2013 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: September 6, 2012
Manuscript Accepted: November 11, 2012
Published: January 18, 2013
Zujie Fang, Fei Yang, Haiwen Cai, and Ronghui Qu, "Coupled-mode equation of polarization modes of twisted birefringent fibers in a unified coordinate," Appl. Opt. 52, 530-537 (2013)