Abstract
A numerical study on the hysteretic responses of deep nonlinear Bragg grating systems with symmetric three-layer unit cells has been carried out on the basis of a generalized coupled mode theory modified to accommodate deeper nonlinear refractive index modulation. The results show that the in-gap bistability offers the most favorable features in terms of switching width and threshold for optical switching application. Calculated variations of these operational features with respect to the layer thickness, operating wavelength and nonlinear index contrast provide useful guidance for the design of grating systems intended for specific optical switching applications.
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