Planar comb filters based on aberration-free elliptical grating facets

Author

Bidnyk, Serge ; Balakrishnan, Ashok ; Delâge, André ; Gao, Mae ; Krug, Peter A. ; Muthukumaran, Packirisamy ; Pearson, Matt

Author_Institution

Enablence Inc., Ottawa, Ont., Canada

Volume

23

Issue

3

fYear

2005

fDate

3/1/2005 12:00:00 AM

Firstpage

1239

Lastpage

1243

Abstract

A new approach for eliminating aberration effects through introduction of elliptical grating facets in optical comb filters is presented. Simulation results show remarkable improvements of comb filter performance for aberration-free elliptical facets compared to traditional flat facet designs. The proposed theory was validated through design and fabrication of 100-GHz-period planar silica-on-silicon comb filters for use in multiwavelength optical sources. Multimode interference structures were used to achieve both flat-top and Gaussian spectral comb filter responses. All devices showed high extinction ratio, low nonuniformity in insertion loss, and high degree of passband shape control.

Keywords

aberrations; comb filters; diffraction gratings; light interference; optical design techniques; optical fabrication; optical filters; optical losses; Gaussian spectral comb filter; aberration-free elliptical grating facets; insertion loss; multimode interference; multiwavelength optical sources; passband shape control; planar comb filters; silica-on-silicon comb filters; Extinction ratio; Filtering theory; Gratings; Insertion loss; Interference; Optical design; Optical device fabrication; Optical filters; Optical losses; Passband; Comb filter; gratings; integrated optics; optical waveguide filters; wavelength-division multiplexing;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2004.841438

Filename

1417021