Abstract
In previous studies addressing polarization evolution in optical fibers,
the frame of reference in which polarization rotation in twisted optical
fibers is described lacks the compatibility with the modeling of some fiber
sensor applications. We therefore introduce a formulation of the
polarization evolution in a twisted optical and birefringent fiber, which is
based on a laboratory coordinate system. We employ coupled mode theory using
the fundamental modes of a single mode fiber as a basis. We treat the
birefringence of the polarization maintaining fiber and the twist induced
birefringence as perturbations introduced into this mode system.We demonstrate the derivation of the coupling coefficients and solve the
coupled mode equations for different sets of problems. We compare our
results to existing formulations and find an excellent agreement between the
theories for highly birefringent fibers.
© 2009 IEEE
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