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By investigating the influence of the difference of refractive index between core and cladding(nco-ncl),normalized frequency(V)and core radius(α)on both the intramodal and intermodal nonlinear coefficients(NCs)respectively,we design a novel weakly-coupled four-mode fiber with low nonlinearity.In general,under the premise of ensuring the low NCs between two non-degenerate modes,this design can reduce the intermodal NCs(<0.5 W-1·km-1)between two degenerate modes and optimizes the parameters of differential group delays(DGDs)and chromatic dispersion.The optimized few mode fiber(FMF)is eligible for transmission and mode de-multiplexing in the receiver.
By investigating the influence of the difference of refractive index between core and cladding (nco-ncl), normalized frequency (V) and core radius (α) on both intramodal and intermodal nonlinear coefficients (NCs) respectively, we design a novel weakly- coupled four-mode fiber with low nonlinearity. general, under the premise of ensuring the low NCs between two non-degenerate modes, this design can reduce the intermodal NCs (<0.5 W-1 km-1) optimizes the parameters of differential group delays (DGDs) and chromatic dispersion. The optimized few mode fiber (FMF) is eligible for transmission and mode de-multiplexing in the receiver.