Optical fiber communication 182021/2/19 Fresnel反射系数 R 71+12 3、 Frere损耗 L(aB)=-10g( 4n1/n3 1+n1/n3) )×21 -18 Copyright Wang Yan 2021/2/19 Optical fiber communications 3、Fresrel损耗 Fresrel反射系数： 2 1 3 1 2   +− = n n n n R ( ) ) 2 1 / 4 / ( ) 10lg( 2 1 3 1 3  + = − n n n n L dB