Nonreciprocal behavior and switching in optical couplers with longitudinally varying coupling coefficient.

@article{Tran2012NonreciprocalBA,
  title={Nonreciprocal behavior and switching in optical couplers with longitudinally varying coupling coefficient.},
  author={Truong X. Tran and Fabio Biancalana},
  journal={Optics letters},
  year={2012},
  volume={37 10},
  pages={1772-4}
}
We report the nonreciprocal behavior of an optical coupler consisting of two straight waveguides forming a small angle. An optical diode action is theoretically demonstrated when light is launched along opposite directions. The switching power is lower than the case of parallel waveguides with a constant coupling coefficient. 

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