Abstract
In this paper, we have studied stress-induced group delay variations in
hole-assisted fibers (HAFs), experimentally and theoretically for parallel
transmission systems. Recently, HAFs having low bending losses have been
developed. A fiber ribbon that uses HAFs will be suitable for parallel
transmission systems when used in a small space. Additional skew occurs when
a fiber ribbon is used under nonuniform stress environment. It is important
to know the difference between single-mode fibers (SMFs) and HAFs with
respect to stress-induced group delay variations. First, we find out the
difference experimentally. Then, we propose a theory to explain the
difference. The results calculated by the proposed theory are in good
agreement with experimental data. Finally, we discuss the group delay
variations, such as the difference between SMFs and HAFs, and the wavelength
dependence. We also try to explain the measured group delay variations of
five HAFs in a unified way in order to estimate group delay variations of
HAFs with various cross-sectional structures.
© 2009 IEEE
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