Abstract
The bending loss and birefringence in an embedded-core hollow fiber
are investigated numerically and experimentally. The bending losses of the
fiber for two polarized lights are measured for different bending orientations
and bending radii. Both the simulated and measured results show that the bending
loss of the embedded-core hollow fiber has a strong directional dependence.
The bending loss is larger and more sensitive to bending radius when the fiber
is bent toward the core direction. In the opposite bending direction, the
fiber has the antibending capacity. Because the core of the fiber sample is
a nonstrict elliptical, a critical orientation angle exists during the bending
of the optical fiber. Away from the critical angle, the bending losses are
not sensitive to the bending orientation regardless of antibending direction
or bending sensitive direction. The group birefringence of the optical fiber
is also measured.
© 2012 IEEE
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