Intensity Fluctuations Observed At A Pigtailed Source End-Face In Optical System

Isabelle Verrier; Jean-Pierre Goure

doi:10.1117/12.941366

28 September 1987 Intensity Fluctuations Observed At A Pigtailed Source End-Face In Optical System

Isabelle Verrier, Jean-Pierre Goure

Proceedings Volume 0805, Optical Components and Systems; (1987) https://doi.org/10.1117/12.941366
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands

Abstract

Interferences between the different propagation modes in an optical fiber called the modal noise, is already a well-known problem. Intensity fluctuations severely affect the perforMance in optical communication systems ; on the other hand, they can be used for sensors design. Pigtailed sources are often used in order to characterize optical fibers as well as in some optical devices. These fluctuations are caused by the instability of the source and by the presence of the pigtail. More particularly, we studied the fluctuations of the available energy and its repartition on the end-face of a graded index pigtail for different types of sources (coherent or incoherent), for various light wavelengths and constraints. We used a near field method and the convolution of the end pigtail image by an area of the same size. When the fiber has random vibrations in incoherent light, experimental values can be compared to the calculated values for the coupled energy and signal to noise ratio (S/B). In incoherent light, when fiber is motionless and in coherent light, an experimental study has been carried out for several wavelengths with the same set-up. In this paper, we give the results concerning the signal to noise ratio S/B according to the strain. We also estimate the speckle mean diameter with experimental values for several wavelengths. We characterized the modal noise influence in measurements for particular optical applications. The results of our experiments show the limits of the use of such sources in optical devices.

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Isabelle Verrier and Jean-Pierre Goure "Intensity Fluctuations Observed At A Pigtailed Source End-Face In Optical System", Proc. SPIE 0805, Optical Components and Systems, (28 September 1987); https://doi.org/10.1117/12.941366

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KEYWORDS

Signal to noise ratio

Sensors

Optical components

Near field

Graded index fibers

Optical fibers

Speckle pattern

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