Patent ID: 6810182
Filing Date: 2004-10-26
Classification: G02F

Abstract:
An optical tuneable grid-assisted add/drop filter of codirectional operating mode structured as a directional coupler filter with at least two waveguides of different refractive indices and extending closely adjacent each other, one of the waveguides being provided with a grid,characterized by the fact that the material of the two waveguides is formed from materials of two different classes of different optical parameters, the coefficient of the thermal refractive index dn/dT and/or the electro-optic coefficient dn/dE and/or the dispersion dn/d&lgr; of the two materials differing such that action on the two wave guides of identical technical means for changing the temperature and/or the electric field and/or the wavelength results in different effects and that means are provided for changing these optical parameters.