Theoretical study of gain-induced mode coupling and mode beating in few-mode optical fiber amplifiers

Jean-Baptiste Trinel , Guillaume Le Cocq (1) , Yves Quiquempois (2) , Esben Ravn Andresen , Olivier Vanvincq (1) , Laurent Bigot (1)

1 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523
2 IRCICA - Institut de Recherche sur les Composants logiciels et matériels pour l'Information et la Communication Avancé - UAR 3380

We developed a generalized field-propagating model for active optical fibers that takes into account mode beating and mode coupling through the amplifying medium. We applied the model to the particular case of a few-mode erbium doped fiber amplifier. Results from the model predict that mode coupling mediated by the amplifying medium is very low. Furthermore, we applied the model to a typical amplifier configuration. In this particular configuration, the new model predicts much lower differential modal gain than that predicted by a classical intensity model.

Domaines: Optique [physics.optics]

Jean-Baptiste Trinel, Guillaume Le Cocq, Yves Quiquempois, Esben Ravn Andresen, Olivier Vanvincq, et al.. Theoretical study of gain-induced mode coupling and mode beating in few-mode optical fiber amplifiers. Optics Express, 2017, 25 (3), pp.2377. ⟨10.1364/OE.25.002377⟩. ⟨hal-02476222⟩