Abstract
Misalignment effects on the spectral characteristics of edge filters
based on singlemode–multimode–singlemode (SMS) fibre structures
are investigated numerically and experimentally. A modal propagation analysis
is used with a set of guided modes calculated using the finite-difference
method to determine the transmission loss of the SMS-based edge filters. A
limit for the tolerable misalignment of the SMS fiber-based edge filter is
proposed, beyond which the spectral performance of the SMS structure degrades
unacceptably. The numerical results are verified experimentally with good
agreement.
© 2009 IEEE
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