title: Contradirectional couplers in silicon-on-insulator rib waveguides.
abstract: We demonstrate contradirectional couplers in silicon-on-insulator rib waveguides using a CMOS compatible technology, in which a periodic dielectric perturbation is introduced in the coupling region between two different-sized rib waveguides. This structure enables high fabrication tolerances for narrow-bandwidth add-drop filters, using commercially available deep-ultraviolet lithography, that do not suffer from having a free spectral range. The simulation using coupled-mode theory and mode-profile calculations shows good agreement with experiment. A narrow bandwidth of 0.35 nm and a low loss of less than 1 dB have been achieved experimentally.
authors: Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada. weis@ece.ubc.ca
authors: W
authors: W
authors: Shi
authors: X
authors: X
authors: Wang
authors: W
authors: W
authors: Zhang
authors: L
authors: L
authors: Chrostowski
authors: N A F
authors: NA
authors: Jaeger