Optical fiber communication Model Dispersion 32021/2/19 Group delay dB 波长相同,β不同 8 do kon,<B<k 最低阶模的纵向浪矢:=kon1 最高阶模的纵向波矢:B=k0n2 dB「n1,,chm 最低阶模的纵向波矢:B=kn1:Tow-doLc""do +k dB_ n2 k dn2 最高阶模的纵向液矢B=k0n2hgh=doLc d Model Dispersion can be expressed(note that t has units of S/m)1-3 Copyright Wang Yan 2021/2/19 Optical fiber communications 一、Model Dispersion Group delay:    d d g = 波长相同，β不同 0 1 0 2 k n    k n 最低阶模的纵向波矢： 0 2 0 1 k n k n = =   最高阶模的纵向波矢： 最低阶模的纵向波矢：       = = = +      d dn k c n d d k n low 1 0 1 0 1 : 最高阶模的纵向波矢：       = = = +      d dn k c n d d k n high 2 0 2 0 2 : Model Dispersion can be expressed (note that has units of S/m) 