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Increase of the minor field component in stress-induced birefringent fibers, due to nonuniformity of stress

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1 Author(s)
C. Vassallo ; Center National d'Etudes des Telecommunications, Lannion, France

Analytical evaluations of the minor x -component of a LPO1 mode polarized along y -axis in strongly birefringent optical fibers are proposed, for weakly guiding step-index fibers. In the assumption where the \bar{\bar{\epsilon}} -tensor is everywhere diagonalized in x-y-z axes, it is shown that the anisotropy has little effect on the minor component and that the polarization ratio (Expower/Eypower) remains within a few decibels from its value in an isotropic fiber. A considerably larger change can be predicted from a more realistic analysis of real birefringent fibers, taking into account the nonuniformity of the stress which produces the birefringence; this nonuniformity makes off-diagonal coordinates-dependent terms to appear in the \bar{\bar{\epsilon}} -tensor. A recent experimental report can thus be explained.

Published in:

Journal of Lightwave Technology  (Volume:5 ,  Issue: 1 )