Abstract
A model based on coupling-mode theory, for the quantitative analysis of chromatic dispersion characteristics of triple-clad single-mode fibers, is proposed. The strong wavelength dependence of the coupling between a core mode and a ring mode supported by the high-index second cladding of the waveguide structure is shown to be responsible for the dispersion-flattened characteristics of the fiber. Cutoff properties of this type of fiber are also analyzed according to the proposed model.
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