Abstract
Effects of the film index of nonlinear-cladding optical waveguides on
the evolution of fields at medium power levels are investigated numerically.
The analysis method is based on mode matching of local normal modes of bounded
waveguides. For waveguides with a film whose refractive index is greater than
or nearly equal to the linear part of the index of the nonlinear cladding,
the path of a beam winds between the film and the nonlinear cladding or in
the film. In the case of a film index that is to some extent less than the
linear part index of the nonlinear cladding, a beam is emitted
to the nonlinear cladding, i.e., spatial soliton emission occurs. The lateral
shift of a butt-coupled linear waveguide toward the substrate makes a beam
emit to the nonlinear cladding with increased angles. Saturation and linear
absorption weakens the winding of a path or decreases the angle of emission.
© 2008 IEEE
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