Modal decomposition technique for multimode fibers

We propose a new solution for modal decomposition in multimode fibers, based on a spectral and spatial imaging technique. The appearance of spurious modes in the spectral and spatial processing of the images at the output of the fiber under test when it has more than two modes is demonstrated theore...

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Bibliographic Details
Published in:Applied optics (2004) 2012-02, Vol.51 (4), p.450-456
Main Authors: Nguyen, Duc Minh, Blin, Stéphane, Nguyen, Thanh Nam, Le, Sy Dat, Provino, Laurent, Thual, Monique, Chartier, Thierry
Format: Article
Language:English
Subjects:
Decomposition
Engineering Sciences
Fibers
Imaging techniques
Optics
Photonic
Physics
Spectra
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Summary:We propose a new solution for modal decomposition in multimode fibers, based on a spectral and spatial imaging technique. The appearance of spurious modes in the spectral and spatial processing of the images at the output of the fiber under test when it has more than two modes is demonstrated theoretically. The new method, which allows us to identify spurious modes, is more accurate, simpler, and faster than previously reported methods. For demonstration, measurements in a standard step-index multimode fiber and a small-core microstructured fiber are carried out successfully.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.51.000450