Abstract
The characteristics of length-apodized phase-shifted fiber optic long
period gratings with full and partial nanostructured coatings have been explored
theoretically and experimentally. The twin rejection bands that are characteristic
of length-apodized phase-shifted long period gratings are studied for a long
period grating (LPG) operating at the phase matching turning point. When one
half of the length of the LPG is coated, complex bandgap like structure appears
within the transmission spectrum, which may be of benefit to spectral filter
design and for sensing applications.
© 2012 IEEE
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