Model of a nonlinear directional coupler in gallium arsenide

Gibbons, Wayne M.; Sarid, Dror
August 1987
Applied Physics Letters;8/10/1987, Vol. 51 Issue 6, p403
Academic Journal
We have calculated the response of a nonlinear directional coupler fabricated in an AlGaAs/GaAs structure using a realistic model for the optical nonlinearities. The model takes into account carrier-density-dependent index of refraction and absorption, and lateral carrier diffusion in each of the two coupled channel waveguides. Our results differ considerably from those obtained using a Kerr model for the optical nonlinearities.


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