Apodisation of photo-induced waveguide gratings using double-exposure with complementary duty cycles


We present a novel apodisation scheme for photo-induced waveguide gratings. The apodisation is implemented with double exposures that have reversely varying duty cycles. We have successfully applied the proposed scheme to remove the sidelobes of long period gratings (LPGs). We also observed for the first time super strong sidelobes in LPGs when creating them with only a single varying-duty-cycle exposure. The strong sidelobes can be well explained with a Mach-Zehnder interference model.

Divisions: College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies > Electronics & Computer Engineering
College of Engineering & Physical Sciences
Additional Information: © 2008 Optical Society of America
Uncontrolled Keywords: apodisation scheme, photo-induced waveguide gratings, double exposures, reversely varying duty cycles, Atomic and Molecular Physics, and Optics
Publication ISSN: 1094-4087
Last Modified: 23 Oct 2019 11:10
Date Deposited: 29 Sep 2010 12:31
Published Date: 2008-02-04
Authors: Shu, Xuewen
Sugden, Kate
Bennion, Ian


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