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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 29,
  • Issue 19,
  • pp. 3009-3014
  • (2011)

Ab initio Design, Experimental Validation, and Scope of Coupling Coefficients in Waveguide Arrays and Discrete Photonics Patterns

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Abstract

In coupled waveguide arrays, well-defined coupling coefficients are still required to demonstrate advanced effects on a quantitative basis, especially in patterned arrays where new discrete photonics functions need accurate coupling gradients. We show that adequate arrays of strip loaded waveguides designed within an extended second-neighbor coupled-mode theory can actually be constructed by means of state-of-the-art technologies, with the necessary coupling coefficient ratios (~0.5) and accuracies (~10%). We also specify for literature systems the weak coupling regime where the conventional coupled-mode theory truly applies, and the moderate coupling regime where the extended theory is required but can be approximated by the conventional theory with an apparent coupling coefficient.

© 2011 IEEE

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