73 research outputs found
Nonlinear parity-time-symmetric transition in finite-size optical couplers
Parity-time-symmetric (-symmetric) optical waveguide couplers
offer a great potential for future applications in integrated optics. Studies
of nonlinear -symmetric couplers present new possibilities for
ultracompact configurable all-optical signal processing. Here, we predict
nonlinearly triggered transition from a full to a broken
-symmetric regime in finite-size systems described by smooth
permittivity profiles and, in particular, in a conventional discrete waveguide
directional coupler configuration with a rectangular permittivity profile.
These results suggest a practical route for experimental realization of such
systems
Asymmetric partially coherent solitons in saturable nonlinear media
We investigate theoretically properties of partially coherent solitons in optical nonlinear media with slow
saturable nonlinearity. We have found numerically that such a medium can support spatial solitons which are
asymmetric in shape and are composed of only a finite number of modes associated with the self-induced
waveguide. It is shown that these asymmetric spatial solitons can propagate many diffraction lengths without
changes, but that collisions change their shape and may split them apart. [S1063-651X(99)12808-3
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