Abstract

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 μm, 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 μm and upward, the value of the corresponding signal-to-noise ratio reduction is seen to vary in only a very small range (<2 dBV). Under this condition the modal noise induced in the fiber cannot be suppressed by the incoherent nature of the light source, thus showing the practical limitation of the use of multimode fibers in an interferometric system with a low-coherence light source.

© 1994 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Measurement of up- and down-lead fiber sensitivity caused by the lead in a multimode fiber in an interferometric system

Y. N. Ning, K. T. V. Grattan, A. W. Palmer, and K. Weir
Appl. Opt. 33(31) 7529-7535 (1994)

Extrinsic optical-fiber interferometric sensor that uses multimode optical fibers: system and sensing-head design for low-noise operation

S. Chen, A. W. Palmer, K. T. V. Grattan, and B. T. Meggitt
Opt. Lett. 17(10) 701-703 (1992)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (6)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription