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 higher-order 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. 1. Introduction Silica multimode graded-index fibers are used in a wide variety of applications ranging from on-board to in-premises networks links with length not more than 1–2？km. Since IEEE 802.3z standard was ratified and commercial available SFP transceivers with Vertical Cavity Surface Emitting Lasers (VCSELs) appeared on telecommunication market, multimode fibers became very popular both for in-building structural cabling systems (SCS) and typical distributed networks with backbone/vertical fiber cabling systems, private networks in premises, and campus environments. Nowadays the most top applications of multimode fibers are associated with data center SCS, high bit-rate storage area networks, and radio-over-fiber (RoF) techniques over already installed multimode fiber infrastructure inside building [1–3]. Modern commercial multi-Gigabit transmission transceivers are realized on Vertical Cavity Surface Emitting Lasers (VCSELs) or single-mode Fabry-Perot laser diodes (LD) [1–4]. Because emission from the conventional VCSEL usually consists of about 5 or 6 transversal modes with maximal azimuthal order not more than 3, and single-mode LD injects just fundamental and lower-order modes and , only several guided modes are excited in multimode fiber link [5–7]. Therefore optical signal propagates over multimode fiber link in a so-called few-mode regime, and passage to the simulation of a few-mode pulse transmission over multimode fiber requires taking into account both “individual” dispersion parameters of mode component with particular order (amplitude, attenuation, delay, chromatic dispersion, etc.) and mode coupling. A variety of methods have been developed for modeling and simulation of laser-based multi-Gigabit data transmission over multimode fibers. Monograph [4] can be considered as fundamental complete basis work. The
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