Abstract

An exact analysis using the Green’s function formulation of an arbitrarily oriented off-axis dipole in a three-layer cylindrical dielectric waveguide is carried out. The practical significance of such a formulation is illustrated by its immediate application to the problem of radiation due to scattering from an arbitrarily located discrete inhomogeneity in step-index fibers in which the dominant HE₁₁ mode propagates. For small dielectric differences between the adjacent layers, the analysis yields radiation loss that agrees well with that evaluated from the infinite-medium approximation. However, the spatial distribution of the radiation loss differs markedly from that predicted by the infinite-medium approximation.

© 1980 Optical Society of America

Scattering from a localized inhomogeneity in a cladded fiber optical waveguide. 1: Radiation loss

G. L. Yip and J. Martucci
Appl. Opt. 15(9) 2131-2136 (1976)

Transversely incident beam wave scattering from inhomogeneous fibers

R. F. Cordero Iannarella
J. Opt. Soc. Am. 70(7) 799-804 (1980)

Weakly guiding optical fibers

Allan W. Snyder
J. Opt. Soc. Am. 70(4) 405-411 (1980)

Scattering from inhomogeneities inside a fiber waveguide

Nikolaos K. Uzunoglu
J. Opt. Soc. Am. 71(3) 259-273 (1981)

Radiation losses of step-tapered channel waveguides

D. Marcuse
Appl. Opt. 19(21) 3676-3681 (1980)