Modal decomposition technique for multimode fibers

Duc Minh Nguyen (1) , Stéphane Blin (2, 3) , Thanh Nam Nguyen (1) , Sy Dat Le (1) , Laurent Provino (4) , Monique Thual (1) , Thierry Chartier (1)

1 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
2 IES - Institut d’Electronique et des Systèmes
3 TéHO - Térahertz, hyperfréquence et optique
4 PERFOS - Plate-Forme d'Etudes et de Recherche sur les Fibres Optiques Spéciales

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.

Domaines: Optique / photonique; Optique [physics.optics]

Duc Minh Nguyen, Stéphane Blin, Thanh Nam Nguyen, Sy Dat Le, Laurent Provino, et al.. Modal decomposition technique for multimode fibers. Applied optics, 2012, 51 (4), pp.450-456. ⟨10.1364/AO.51.000450⟩. ⟨hal-00711171⟩