Abstract
We report on birefringence measurements in double-clad fibers with
large cross section, doped with neodymium and ytterbium. The
experimental results for rectangular double-clad fibers are compared
with those for single-clad circular neodymium-doped fibers, taking into
account existing models of stress- and geometry-induced
birefringence. We demonstrated that the ellipticity of an outer
silica cladding has no effect on birefringence in large-area
double-clad fibers. The stress-induced birefringence is shown to
depend on the ratio between the diameter of an internal silica support
and the linear dimensions of the rectangular outer cladding. The
stress-distribution pattern is derived to prove the experimental
results.
© 2000 Optical Society of America
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