Queries, comments, suggestions? Please contact us.



Area Optical fibre communication / Propagation characteristics

IEV ref731-03-30

Symbol
N

en
group index
the speed of light in vacuum, divided by the magnitude of the group velocity of the mode

Note 1 – For a plane wave of wavelength λ, it is related thus to the refractive index n:

N=nλ dn dλ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaad6eacqGH9aqpcaWGUbGaeyOeI0Iaeq4UdW2aaSaaaeaacaqGKbGaamOBaaqaaiaabsgacqaH7oaBaaaaaa@3F3F@

where λ is the wavelength.

Note 2 – Each mode has its own group index.


fr
indice de groupe, m
rapport de la vitesse de la lumière dans le vide à la norme du vecteur vitesse de groupe

Note 1 – L'indice de groupe est lié à l'indice de réfraction n par la formule:

N=nλ dn dλ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaad6eacqGH9aqpcaWGUbGaeyOeI0Iaeq4UdW2aaSaaaeaacaqGKbGaamOBaaqaaiaabsgacqaH7oaBaaaaaa@3F3F@

λ est la longueur d'onde.

Note 2 – Chaque mode d'un guide d'ondes a son propre indice de groupe.


ar
دليل مجموعة

de
Gruppenbrechzahl, f

es
índice de grupo

fi
ryhmätaitekerroin

it
indice (di rifrazione) di gruppo

ko
군 굴절률

ja
群屈折率

pl
współczynnik grupowy załamania

pt
índice de grupo

sv
gruppindex

Publication date: 1991-10
Copyright © IEC 2019. All Rights Reserved.