Title :
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
fDate :
3/1/2005 12:00:00 AM
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;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.841438
