الفهرس 
Introduction
Fiber ModesOnly 14 pages are availabe for public view
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Abstract
With the exponential growth rate of Internet trac in cloud computing and big data, the space division multiplexing (SDM), has attracted much attention to greatly provide transmission capacity increase for optical ber communication systems in recent years. Existing single mode ber based optical communication network approaches its maximum capacity limit due to the nonlinear e ects in the ber optic. Industry and research community are exploring the exploitation of the spatial dimension in addition to wavelength, time, and code. Three techniques are under investigation in order to bent from this additional dimension including: few mode ber, multi-core ber, and orbital angular momentum. Few mode ber optical system consists of enabling di erent modes of propagation to co-propagate in the same ber core, each of which can independently carry N wavelength division multiplexing. sub-channels. In this work, we focus on next generation FMF based MDM system that su ers from two main optical ber impairment which is the dispersion and coupling, between propagating modes or spatial channels. We investigate the parameters of W-shape Graded Index Few Mode Fiber in order to use it in MDM transmission link. We successfully design a low DMD W-GI FMF enabling six LP mode propagation ber LP01, LP11, LP31, LP02, LP31, and LP12 with a DMD that is lower than 50 ps/km over the C- and L- band. Then, we have designed a novel few mode bele to achieve low DMD and large mode eld diameter for mode-division multiplexing. It is shown that bers with DMD less than 2 ps/m for six LP modes (20 eigenmodes) can be designed using the optimized di erence of Gaussian (DoG) FMF profile.