Analysis and design of grating couplers |
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Authors: | T Tamir S T Peng |
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Institution: | (1) Department of Electrical Engineering, Polytechnic Institute of New York, 11201 Brooklyn, N. Y., USA |
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Abstract: | Based on an accurate perturbation analysis of the guiding properties of dielectric gratings, simple design criteria are developed
for grating couplers which transfer the energy of a beam into or out of an optical waveguide. Gratings having arbitrary groove
shapes are considered and explicit formulae are given for the leakage parameters of gratings with symmetric profiles. The
results cover TEv and TMv modes and they apply to both shallow and deep grating grooves. The variation of the leakage parameter α in rectangular gratings
is examined in detail; these rectangular gratings are then used as basic configurations for predicting the characteristics
of other grating profiles. Particular attention is given to trapezoidal and triangular profiles and gratings with asymmetric
profiles are also discussed. |
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Keywords: | 42 82 84 |
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