Optical fiber communication 72021/2/19 使激发率最高的那个S值,此即等效模场半径 SIF的 Gaussian approximation的等效模场半径 0/a=0.65+1.6193+2.8796 russian VS P 01 mode The two mode shapes Gaussian Approximation are well matched. but to the He mode the Gaussian falls off quickly at large radii. The energy in the tail is important in cross LP talk calculations 024681012141-7 Copyright Wang Yan 2021/2/19 Optical fiber communications 使激发率最高的那个 0 S 值，此即等效模场半径。 SIF的Gaussian approximation 的等效模场半径： 1.5 6 0 / 0.65 1.619 2.879 − − S a = + V + V LP01 Gaussian VS LP01 mode 0 2 4 6 8 10 12 14 0 S r Gaussian Approximation to the HE11 mode The two mode shapes are well matched, but the Gaussian falls off quickly at large radii. The energy in the tail is important in cross￾talk calculations