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.
© 2005 IEEE
Serge Bidnyk, Ashok Balakrishnan, André Delâge, Mae Gao, Peter A. Krug, Packirisamy Muthukumaran, and Matt Pearson, "Planar Comb Filters Based on Aberration-Free Elliptical Grating Facets," J. Lightwave Technol. 23, 1239- (2005)