Title :
Properties of Length-Apodized Phase-Shifted LPGs Operating at the Phase Matching Turning Point
Author :
James, Stephen W. ; Topliss, Stephen M. ; Tatam, Ralph P.
Author_Institution :
Dept. of Eng. Photonics, Cranfield Univ., Cranfield, UK
fDate :
7/1/2012 12:00:00 AM
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.
Keywords :
diffraction gratings; energy gap; nanophotonics; optical fibres; optical films; optical filters; optical phase matching; complex bandgap; fiber optic long period gratings; length apodized phase shifted LPG; nanostructured coatings; phase matching turning point; spectral filter design; transmission spectrum; twin rejection bands; Attenuation; Coatings; Couplings; Gratings; Optical frequency conversion; Turning; Nanoscale coatings; optical fiber long period gratings; optical filter;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2195473
