A periodic array of optical waveguides creates a novel kind of device in which new
types of spatial solitons can be generated and studied experimentally. The properties
of spatially localized modes in a waveguide array are usually analyzed in the frame-
work of a set of coupled-mode equations, each equation representing the soliton ampli-
tude in a specific waveguide but coupled to the neighboring waveguides. We consider
such a coupled set of equations in Section 11.1, referred to as the
discrete
nonlinear
Schr6dinger (NLS) equation, and discuss its localized solutions, known as
discrete
solitons. ...
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