Coupler-apodized Bragg-grating add-drop filter
Publication Type:Journal Article
Source:Optics Letters, Volume 38, Issue 16, p.3068–3070 (2013)
We demonstrate an apodization technique using tapered coupler gaps in grating-assisted asymmetric couplers, which circumvents the need for tapered waveguide perturbations and enables a higher tolerance to fabrication errors. A high sidelobe suppression ratio of 30 dB has been obtained on the submicrometer silicon-on-insulator platform using a CMOS-compatible photonics process with 193 nm lithography.