Abstract
Filters operated close to the critical coupling were reported to be
capable of an increase and decrease of the group velocity. The published examples
are ring resonators (feedback-based filter) and Mach–Zehnder filters
(no feedback filters). Here we show that these linear filters have, within
certain bandwidth, identical filtering characteristics, although they are
based on completely different filtering principles. Further, we demonstrate
experimentally a long period fiber grating as another no-feedback filter that
is capable to perform similar filtering characteristics when operated close
to the critical coupling condition. This scheme may be of interest due to
inherently large bandwidth provided by long-period fiber grating based filters.
In the example given here, filters compatible with systems operating at repetition
rates up to 40 GHz are demonstrated.
© 2008 IEEE
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