A novel waveguide coupler configuration consisting of two identical antiresonant reflecting optical waveguides is presented. The coupling length is a periodic function of the waveguide separation, and therefore a remote coupler can be realized.
The ability of Bragg reflection waveguides to support TE-polarized nonlinear guided waves is studied. The dispersion relation for these waves is derived analytically. The numerical studies address the dependence of their propagation constants upon the interface intensity, the guided field power, and their evolution as they propagate down the guide. The characteristic features of the nonlinear guided waves are identified as power thresholds, instability on positively-sloped branches of the dispersion curve and symmetry breaking with the formation of spatial solitons.
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