tight-binding approximation, the coupled-mode approach,
and the
two-component
model.
Tight-Binding Approximation
When each thin-film waveguide of the periodic structure supports a single mode that
weakly overlaps with the modes of the two neighboring waveguides, the modes are
only weakly coupled via a small change of the refractive index in the waveguides.
The properties of discrete solitons can then be analyzed in the framework of the tight-
binding approximation discussed earlier [64].
To employ this approximation, we first analyze the properties of a single thin-film
waveguide in the ...
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