Design of Dispersion Flattened and Compensating Fibers for Dispersion-Managed Optical Communications Systems

Single mode optical fibers with low non-zero dispersion over two optical wavelength windows of 1300 and 1550 nm regions are essential for multi-channel operation of dense and coarse WDM systems to minimize the linear pulse broadening and nonlinear four wave mixing effects. Non-zero dispersion flattening of the dispersion factor extending over a wavelength range of more than 350 nm is achievable. Further we present designs of non-zero low dispersion flattened fiber rand dispersion compensating fiber over the entire S- to L-bands spectral window. The design of a unity "Kappa" and a near-zero dispersion-length product for a 100 km dispersion-managed fiber span is demonstrated. The effects of the geometrical and index distribution parameters of triple-clad index profile on the fiber total dispersion are also considered. Design guidelines and identification of critical fiber parameters are provided.