Contradirectional couplers in silicon-on-insulator rib waveguides |
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Authors: | Shi W Wang X Zhang W Chrostowski L Jaeger N A F |
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Institution: | Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada. weis@ece.ubc.ca |
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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. |
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