Optical fiber communication 32021/2/19 L1模的横向场表示式: E=4 Jo(Ur/a)NJo() K0(W/a)K0(W)r≥a x= Jo(Urla)/Jo(u) rsa E K0(W/a)/K0W)r≥ B.DP1归一化场强:传输单位功率P=时的场强(即A值) 1、UK)22) WJo(U)/222 VK, w)(mma VJ,(U)(n2a ∠0-真空中的阻抗1-3 Copyright Wang Yan 2021/2/19 Optical fiber communications LP01 模的横向场表示式：    = ( / )/ ( ) ( / )/ ( ) 0 0 0 0 K Wr a K W J Ur a J U Ey A r a r a      = ( / )/ ( ) ( / )/ ( ) 0 0 0 0 K Wr a K W J Ur a J U Ex A r a r a   B. LP01 归一化场强：传输单位功率P=1时的场强（即A值） 2 1 2 2 0 1 0 2 1 2 2 0 1 0 2 ( ) 2 ( ) ( ) ( )         =         = n a Z VJ U WJ U n a Z VK W U K W A   Z0 －真空中的阻抗