Abstract
Design of differential mode delay (DMD)-compensating silica GeO<sub>2</sub>-doped graded-index multimode fibers with reverse DMD, or so-called reverse DMD fibers (RDMDFs), is presented. DMD-compensating is based on assumption, that initial array of excited mode group velocities of compensated fiber should be reversed in reference to the slowest mode. It is proposed to obtain effect of reverse DMD by fiber profile optimization. Objective function is represented as a sum of squares of deviations between points, corresponding to radial mode orders, of ideal desired reverse group velocity diagram and diagram of current iteration. An extension of modified Gaussian approximation generalized for any order guided mode, propagating along weakly guiding optical fibers with an arbitrary axial-symmetric refractive index profiles, was developed to apply for design RDMDFs. Solution based on proposed method is described. Results of RDMDF design are presented, including optimized refractive index profiles and comparing results between desired ideal mode group velocity diagram and distribution of velocities between guided modes propagating along designed RDMDF.
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