Abstract

A Runge-Kutta procedure was used for investigating the dispersion characteristics of single-mode triangular- index fibers with a trench in the cladding. Numerical results on the total dispersion, its sensitivities to the core radius, wavelength, index difference variations, and its influence on the fiber’s bandwidth–length product are presented. Some interesting features, due to the presence of a trench, are pointed out. One salient feature is the appearance of dispersion flattening over a certain wavelength range near 1.55 μm for b/a = 2 and c/a > 2.7 (a = core radius, b = inner trench radius, c = outer trench radius) where the total dispersion is low, yielding a bandwidth–length product as high as 104 GHz · km. The presence of a trench has not been investigated previously.

© 1990 Optical Society of America

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