11.2: Two examples of discrete solitons found numerically by solving the discrete NLS
equation. Only the soliton shown in the panel (a) is stable.
Numerical simulations show that discrete solitons share a few basic properties with
standard spatial solitons but differ in others. For example, just like spatial solitons,
discrete solitons do not necessarily always propagate along the length of waveguides.
When a discrete soliton is launched with a linear phase gradient across the waveguides,
it propagates at ...
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