Optical fiber communication 42021/2/19 22()Ua)()r≤a E gnd U/K0GW/a)/K1(W)r≥a C.L1模的特征方程 U()J0(U)=W[K1(W)/K0(W 0<U<2.40483,M=1.1428-0.9960 U W D.SI中的二阶模L1 横向场E.= A cos 6 J1(Ur/a)/J1()r≤a K1(W/a)/K1(W)r≥a 2.4048<U<3.831711-4 Copyright Wang Yan 2021/2/19 Optical fiber communications ( )               = ( / ) ( / )/ ( ) 2 / ( / )/ ( ) 0 1 0 1 2 1 2 2 0 U V K Wr a K W W V J U r a J U n a Z Ey  r a r a   C. LP01 模的特征方程     2 2 1 0 1 0 0 2.40483 1.1428 0.9960 ( )/ ( ) ( )/ ( ) U V W U W V U J U J U W K W K W = −   = − = ， D. SIF中的二阶模 LP11 横向场    = ( / )/ ( ) ( / )/ ( ) cos 1 1 1 1 K Wr a K W J Ur a J U Ey A  r a r a   2.4048 U  3.83171