Abstract
In this paper, we report the fabrication of a polymer segmented cladding
fiber (SCF) that contains four high-index cladding segments, which is coined
the “cross fiber.” In particular, we highlight the difficulties
experienced in the fabrication process. We find that severe shear stresses
at the interface between segments can be created and, as a result, the preform
tends to shatter resulting in the formation of air bubbles during fiber drawing.
The problem becomes more serious as the number of segments increases. Because
the single-mode performance of a SCF depends only weakly on the number of
the high-index cladding segments, to minimize the fabrication difficulty,
it is sufficient to use a SCF with four segments, namely, a cross fiber, for
the realization of large-core single-mode operation.
© 2009 IEEE
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