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.
CITATION STYLE
Shi, W., Wang, X., Zhang, W., Chrostowski, L., & Jaeger, N. A. F. (2011). Contradirectional couplers in silicon-on-insulator rib waveguides. Optics Letters, 36(20), 3999. https://doi.org/10.1364/ol.36.003999
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