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How modal noise in multimode fibers depends on source spectrum and fiber dispersion

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3 Author(s)
Dandliker, R. ; Institut de Microtechnique de 1́Universite, Neuchâtel, Switzerland ; Bertholds, A. ; Maystre, F.

The speckle contrast for multimode fibers, and thus the modal noise, is essentially given by the impulse response of the fiber and the power spectrum of the source. Theoretical and experimental results show that laser sources with a large spectrum of narrow longitudinal modes may cause high speckle contrast and important modal noise over more than 1-km length in graded-index multimode fibers.

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Lightwave Technology, Journal of  (Volume:3 ,  Issue: 1 )