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Mode conversion in optical fibers with monotonically increasing core radius

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1 Author(s)
Marcuse, D. ; AT&T Bell Laboratories, Holmdel, NJ, USA

In this paper we discuss mode conversion in a straight fiber which maintains its circular cross section but whose radiusa(z)increases monotonically with the length coordinatezso that it passes from the single-mode to the multimode regime. Our principal concern is with step-index fibers which are treated in the scalar approximation. We study conversion of power from the incident dominant mode to other core and cladding modes for several functionsa(z). The results of our calculations show clearly that the dominant mode is able to adapt itself to the changing fiber radius provided the change is gradual. For comparison, we also consider a fiber with an infinitely extended radial parabolic-index profile as an approximation to graded index fibers. We show that it too exhibits mode conversion similar to that of the step-index fiber, provided that the comparison is made on the basis of corresponding mode spot sizes instead of actual core radii.

Published in:

Lightwave Technology, Journal of  (Volume:5 ,  Issue: 1 )

Date of Publication:

Jan 1987

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