An Analysis of 40Gbits/s SDM Transmission over 50 Km Graded-Index Few-Mode-Fiber Using Optisystem

Abstract

Few-mode fiber (FMF) based Spatial Division Multiplexing (SDM) is an encouraging technique for
substantial growth of the spectral-efficiency of current hi-tech optical communication networks.FMFs
are the special type of fibers where each guiding mode is treated as a separate data channel. This
type of multiplexing technique suffers through inter-channel-interference (ICI). The ICI in FMFs
arises due to the impairments like mode-coupling and differential-mode-group-delay (DMGD)
between the modes. Both of these impairments directly relate to the index differenceneff between
the guiding modes. Hence the design of FMFs with low mode coupling, low DMGD, large-effectiveareaAeff  , and low bending-loss for SDM transmission is gaining interest for the researcher.In this
work, we have proposed a graded-index-few-mode-fiber (GI-FMF) profile that effectively supports
four linearly-polarized (LP) modes (LP01, LP11, LP21, LP02) with low differential-mode-group-delay
(DMGD), low mode coupling, and large-effective-area.