Mode Conversion in Oblique Bragg Gratings for Integrated Optics

Abstract

High density component integration in guided optics needs reflecting devices. A holographic grating on the guide acting under Bragg conditions deviate the guided light. This reflexinn causes polarization changes so that a T.E. incident wave will give some T.M. reflected wave. Devices of this type have been experimentally studied with special attention to mode conversion efficacity. Theorical study is also reported in a two dimensional calculation. Vectorial normalization conditions in the unperturbed case are derived from Maxwell's equations. Coupled mode treatment of the perturbed propagation is given explaining main experimental results.