14 June 2004 Spectral engineering of lithographically scribed channel waveguide gratings
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We propose and demonstrate a powerful new approach to spectral bandpass engineering (apodization) of one-dimensional channel-waveguide Bragg reflectors. Bandpass engineering is accomplished via precise photolithographic control over the transverse width and longitudinal placement of individual grating lines which, respectively, provide unique line-by-line diffractive amplitude and phase control. Several channel waveguide gratings exhibiting complex filtering functions based on the present apodization method have been fabricated and modeled. They include an essentially polarization -insensitive 4-nm wide flat-top filter with steep roll-off and a multi-passband spectral decoder, useful, e.g., for optical spectral code-division multiplexing or spectral signature recognition. When a second-order apodization effect, comprising effective waveguide refractive index variation with grating-line transverse width, is included in the simulation, extraordinary agreement between predicted and observed spectral passband profiles is obtained.
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Christoph Greiner, Dmitri Iazikov, Thomas W. Mossberg, "Spectral engineering of lithographically scribed channel waveguide gratings", Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); doi: 10.1117/12.529585; https://doi.org/10.1117/12.529585


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