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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