1 February 2008 Phase-shifted photonic crystal waveguide gratings and their application for wavelength demultiplexing
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Optical Engineering, 47(2), 025006 (2008). doi:10.1117/1.2844716
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.
Chao Chen, Xuechun Li, Hanhui Li, Kun Xu, Jintong Lin, "Phase-shifted photonic crystal waveguide gratings and their application for wavelength demultiplexing," Optical Engineering 47(2), 025006 (1 February 2008). http://dx.doi.org/10.1117/1.2844716


Phase shifts

Optical filters

Photonic crystals

Finite-difference time-domain method

Optical communications

Bandpass filters

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