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A simple numerical method has been proposed to compute dispersion for single-mode graded-index fibers with power law profile. The results so obtained are in excellent agreement with those obtained by more complicated methods proposed earlier. It has been shown that there two core radii exist at which dispersion becomes zero. With this method the effect of on-axis dip on these two zero-dispersion core radii have been investigated. A recently proposed single-parameter variational approximation for the LP01 mode has also been utilized to study these effects. The results obtained by the variational method are in excellent agreement with those obtained from the proposed numerical method. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 27–33, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10507 [ABSTRACT FROM AUTHOR]

Based on the variational method, a simple single-parameter approximation for the LP01 mode field of graded-index fibers has been proposed. Using this new approximation as well as the other single-parameter approximations available in the literature, important propagation characteristics such as the propagation constant, splice loss, mode field radius, normalized dispersion, effective area, etc., have been computed, and a comparative study of the accuracies obtained by these approximations has been presented. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 63–73, 1998. [ABSTRACT FROM AUTHOR]