Silicon photonic contradirectional couplers using subwavelength grating waveguides.

@article{Naghdi2016SiliconPC,
  title={Silicon photonic contradirectional couplers using subwavelength grating waveguides.},
  author={Behnam Naghdi and Lawrence R. Chen},
  journal={Optics express},
  year={2016},
  volume={24 20},
  pages={23429-23438}
}
We propose and demonstrate a novel design of contradirectional couplers in which a subwavelength grating (SWG) waveguide replaces one of the asymmetric waveguides of the conventional designs. The fabricated devices in silicon-on-insulator (SOI) platform show over 35 dB suppression of undesired codirectional coupling and larger than 120 nm operating range free from the interference of intrawaveguide reflections thanks to the large optical phase-mismatch between the segmented SWG waveguide and… CONTINUE READING

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