Abstract
We show that a controlled intentional mode coupling induced via scattering
from core inclusions can substantially improve the bandwidth of graded index
multimode fibers with centerline defect. We present a comprehensive analysis
of the impact of the dielectric constant, size, density, and location of
micrometer size inclusions on the bandwidth and attenuation of these fibers.
We show that using a proper design, the bandwidth of a 1-km-long fiber can
improve from 693-MHz to more than 2.5-GHz with less than 1-dB additional
power loss. We also show that in practice, it is possible to obtain the
desired level of mode coupling by exposing the photosensitive core of the
fiber to a UV laser, therefore creating the micrometer size inclusions after
the draw process.
© 2010 IEEE
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