Spectral engineering of lithographically scribed channel waveguide gratings

Christoph Greiner; Dmitri Iazikov; Thomas W. Mossberg

doi:10.1117/12.529585

14 June 2004 Spectral engineering of lithographically scribed channel waveguide gratings

Christoph Greiner, Dmitri Iazikov, Thomas W. Mossberg

Proceedings Volume 5350, Optical Components and Materials; (2004) https://doi.org/10.1117/12.529585
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

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.

Citation Download Citation

Christoph Greiner, Dmitri Iazikov, and Thomas W. Mossberg "Spectral engineering of lithographically scribed channel waveguide gratings", Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); https://doi.org/10.1117/12.529585

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