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Optical Engineering

Accurate prediction of the propagation characteristics of single-mode graded-index fibers by a novel approximation of the fundamental modal field
Author(s): Santanu Sanyal; Somenath N. Sarkar
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Paper Abstract

We propose a novel approximation of the fundamental modal field in single-mode graded-index fiber and present a variational analysis to investigate the propagation parameters of practical interest. Employing the formulated fundamental modal field, we prescribe analytical expressions for normalized Petermann I spot size, group delay, and modal dispersion parameter for single-mode graded-index fiber. With the examples of step- and parabolic-index fibers, we show that these parameters as evaluated by our formalism match excellently with the available exact ones over a wide range of V values. Particularly in the low V region, where the Gaussian approximation is not accurate, our results are found to predict the propagation characteristics accurately. Thus the validity of our formalism is justified. Much less computation is required than with previous methods. The approximation will be useful in the analysis of nonlinear and doped-fiber amplifiers.

Paper Details

Date Published: 1 September 2002
PDF: 6 pages
Opt. Eng. 41(9) doi: 10.1117/1.1479164
Published in: Optical Engineering Volume 41, Issue 9
Show Author Affiliations
Santanu Sanyal, Univ. of Calcutta (India)
Somenath N. Sarkar, Univ. of Calcutta (India)

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