Contradirectional couplers in silicon-on-insulator rib waveguides

  • Shi W
  • Wang X
  • Zhang W
 et al. 
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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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  • W. Shi

  • X. Wang

  • W. Zhang

  • L. Chrostowski

  • N. A. F. Jaeger

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