Optical fiber communication 72021/2/19 k=(mx2+(my2+(92=z m/a cosC COS B n/b cosr R发散角波的传播方向与Z轴之间的夹角1-7 Copyright Wang Yan 2021/2/19 Optical fiber communications 2 2 2 2 2 2 2 2 2 2 2 2 ( ) ( ) ( ) / ( ) ( ) ( ) / ( ) ( ) ( ) / ( ) ( ) ( ) 2 ( ) 2 ( ) 2 ( ) cos cos cos l q b n a m q l l q b n a m n b l q b n a m m a l q b n a m l q b n a m k + + = + + = + + = = + + = + +        R发散角,波的传播方向与Z轴之间的夹角