Abstract
An optically tunable filter device is considered based on a Bragg reflection grating in a nonlinear waveguide. An external light beam of high intensity controls the refractive index via nondegenerate optical Kerr effect and tunes the grating to a selected wavelength. The signal wavelengths are different from the excitation, and typical values of the signal power do not affect the refractive index of the material. Assuming an instantaneous response of the Kerr material and neglecting absorption, we apply the general predictions of the local normal mode expansion theory (LNME) for an arbitrary angle of incidence. A design example is given in a waveguide based on InGaAs on a AlGaAs substrate. The spectral response and tuning range of the waveguide filter device is examined.
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