Abstract:
Modal composition is studied for a waveguide with parabolic refractive index profile through the known directivity diagram of a localized source. Conditions have been determined under which the angular distribution of the localized source field is describable by a decomposition in terms of coherent states. Explicit expressions have been found for the coefficients of waveguide mode excitation, and for the case of non-directed sources a recursive relation was determined for their calculation. The mode composition of a dipole source is shown to be basically dependent on its position with respect to the waveguide axis. It is also demonstrated that, even in the case of a non-directed radiator, selective excitation of individual groups of waveguide modes is feasible.

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