Contradirectional couplers in silicon-on-insulator rib waveguides.

  title={Contradirectional couplers in silicon-on-insulator rib waveguides.},
  author={Wei Shi and Xi Wang and Weiwei Zhang and Lukas Chrostowski and Nicolas A. F. Jaeger},
  journal={Optics letters},
  volume={36 20},
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… CONTINUE READING

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