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In this paper, a quantitative estimation of some important transmission characteristics of single-mode graded index fibers is reported at the 1.3 μm and 1.55 μm wavelength windows. The wave equation is solved to get the near-field in the form of a Kummer function. Two spot sizes, W P and W rms are calculated at different fiber parameters by a numerical integration for the near-field. The accuracy of the method used is tested by a comparison with the power series solution, where a fair agreement for both spot sizes is obtained. Based on the calculated spot sizes, the transmission characteristics are estimated including splice, bending and microbending losses and the chromatic dispersion.

Transmission Characteristics of Single-mode Graded Index Fibers Based on Spot Size Calculations