This work presents an alternative model of multimode fiber links with conventional silica weakly-guiding graded-index irregular multimode fibers under a few-mode optical signal propagation generated by laser source. The proposed model is based on the piecewise regular representation. It takes into account launch conditions, differential mode delay, both lower-and higherorder mode chromatic dispersion, differential mode attenuation, and mode mixing and power diffusion occurring due to real fiber irregularity and micro-and macrobends. We present some results of introduced model approbation with following pulse propagation simulations. A close matching with measured pulse responses at the output of test fibers is noticed.

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In this article present results of measurements for refractive index profile of silica graded multimode optical fibers are presented. The measurement technique is described. Estimation of parameters for profile defects of investigated samples of multimode optical fibers is received. Analysis data for effect of profile defects of graded multimode optical fibers (MMF) on differential mode delay (DMD) is presented.

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