SOME THEORY AND APPLICATIONS OF PERIODICALLY COUPLED WAVES

Parallel‐traveling waves can interact with complete power transfer even though they have different phase constants, provided that the coupling is periodic. This paper outlines some possible applications of this phenomenon, including mode transforming devices, frequency‐selective filters in the microwave and laser wavelength regions, and parametric amplifiers or converters. This paper also gives some coupled‐wave equations for interactions in a nonlinear medium and a generalization of the Tien conditions for parametric wave interaction. © 1969 The Bell System Technical Journal