Abstract
Based on a recently prescribed simple and novel approxima- tion of the fundamental mode, we present analytic expressions for the Petermann II spot size, suitable for evaluating the dispersion parameters of single-mode graded-index fibers. With these expressions, we calcu- late the group delay dispersion factor and also the normalized wave- guide dispersion coefficient. On comparison, our formulation is shown to be superior to the Gaussian approximation and predicts the parameters identically with the exact numerical techniques for step and parabolic index profiles. © 1997 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(97)01509-2)
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