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Optical Engineering

Phase-shifted photonic crystal waveguide gratings and their application for wavelength demultiplexing
Author(s): Chao Chen; Xuechun Li; Hanhui Li; Kun Xu; Jintong Lin
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Paper Abstract

Standard photonic crystal (PC) waveguide gratings show a stopband only in reflection. By incorporating single or multiple phase-shift regions into the PC waveguide gratings, an extremely narrow transmission peak opens up in the reflection band. Using coupled-mode theory together with transfer-matrix formalism, it is shown that by properly choosing the magnitudes of the phase shifts, the transmission spectrum can be tailored into a nearly rectangular line shape. As a specific application, the designed phase-shifted PC waveguide gratings can be used as a filter in dense wavelength-division-multiplexed (DWDM) optical communication systems with a 100-GHz channel spacing. The theoretically calculated results are numerically verified by using two-dimensional (2-D) finite-difference time-domain (FDTD) method.

Paper Details

Date Published: 1 February 2008
PDF: 4 pages
Opt. Eng. 47(2) 025006 doi: 10.1117/1.2844716
Published in: Optical Engineering Volume 47, Issue 2
Show Author Affiliations
Chao Chen, Beijing Univ. of Posts and Telecommunications (China)
Xuechun Li, Beijing Univ. of Posts and Telecommunications (China)
Hanhui Li, Beijing Univ. of Posts and Telecommunications (China)
Kun Xu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)


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