Relation between the coherence length and modal noise in a graded-index multimode fiber for white-light interferometric systems

The results of a comparative experimental study on the effect of modal noise induced by the modal coupling effect in a graded-index multimode fiber that is illuminated by a light source with a tunable coherence length are reported. It has been shown that, in the coherence-length region of 30-80 micr...

Full description

Saved in:
Bibliographic Details
Published in:Optics letters 1994-03, Vol.19 (6), p.372-374
Main Authors: Ning, Y N, Liu, Y, Graftan, K T, Palmer, A W, Weir, K
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The results of a comparative experimental study on the effect of modal noise induced by the modal coupling effect in a graded-index multimode fiber that is illuminated by a light source with a tunable coherence length are reported. It has been shown that, in the coherence-length region of 30-80 microm, the value of the signal-to-noise ratio in an interferometric system could be reduced by the perturbation-induced modal noise, and, as the coherence length increases, the more the signal-to-noise ratio decreases. However, when the value of the coherence length is in the region of 80 microm and upward, the value of the corresponding signal-to-noise ratio reduction is seen to vary in only a very small range (
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.19.000372