This article is cited in 1 paper

Optoelectronics, fiber optics, and other aspects of quantum electronics

Influence of the Rayleigh backscattering on the mode composition of radiation in multimode graded-index waveguides with a quadratic refractive-index profile

G. L. Esayan, S. G. Krivoshlykov


Abstract: A method of coherent states is used to describe the process of Rayleigh scattering in a multimode graded-index waveguide with a quadratic refractive-index profile. Explicit expressions are obtained for the coefficients representing excitation of Gaussian–Hermite backscattering modes in two cases of practical importance: excitation of a waveguide by an extended noncoherent light source and selective excitation of different modes at the entry to a waveguide. An analysis is also made of the coefficients of coupling between forward and backward modes. Explicit expressions for the coefficients representing capture of backscattered radiation by a waveguide are obtained for two special cases of excitation (extended light source and zeroth mode).

UDC: 681.7.068.4

PACS: 42.81.Qb, 42.81.Dp

Received: 08.04.1988

 English version: Soviet Journal of Quantum Electronics, 1989, 19:8, 1116–1120

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