Enhancement of the efficiency of the process of mode diffraction on corrugated sections of optical waveguides

An analysis is made of the process of propagation of radiation in unperturbed and perturbed multilayer optical waveguides. A dispersion relationship convenient for the calculation of the characteristics of complex waveguide structures is derived. A determination is made of the parameter representing the degree of localization of the optical flux of a mode in the vicinity of a given interface between media forming a waveguide. A study is made of the maximalization of the light flux of a mode in the region of a perturbed boundary of a waveguide. Relationships are obtained for calculations dealing with the processes of emission, reflection, and transformation of modes in sections of multilayer waveguides perturbed by corrugations. The influence of an asymmetry of corrugations on the process of mode diffraction is determined. Conditions are found for the use of corrugated sections of optical waveguides in the construction of nonreciprocal integrated-optics components.