Analysis of input-grating couplers having finite lengths.

@article{Brazas1995AnalysisOI,
  title={Analysis of input-grating couplers having finite lengths.},
  author={John C. Brazas and Lixia Li},
  journal={Applied optics},
  year={1995},
  volume={34 19},
  pages={3786-92}
}
Planar waveguide-grating couplers are analyzed to determine the effects of grating length, the incident beam size, and the coupling length of the grating on the input-coupling efficiency. The emphasis is to examine the effects of these finite lengths on the range of angles over which input coupling occurs and the shape of the efficiency curve. A general formula for normalized input-coupling efficiency is given to relate these lengths. When any one of these characteristic lengths is much smaller… CONTINUE READING

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