Geometric parametric instability in periodically modulated graded-index multimode fibers

C. Mas Arabí (1) , Alexandre Kudlinski (1) , Arnaud Mussot (1) , Matteo Conforti (1)

1 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523

We present a theoretical and numerical study of light propagation in graded-index (GRIN) mul-timode fibers where the core diameter has been periodically modulated along the propagation direction. The additional degree of freedom represented by the modulation permits to modify the intrinsic spatiotemporal dynamics which appears in multimode fibers. More precisely, we show that modulating the core diameter at a periodicity close to the self-imaging distance allows to induce a Moiré-like pattern, which modifies the geometric parametric instability gain observed in homogeneous GRIN fibers.

Domaines: Optique [physics.optics]; Science non linéaire [physics]; Optique / photonique

C. Mas Arabí, Alexandre Kudlinski, Arnaud Mussot, Matteo Conforti. Geometric parametric instability in periodically modulated graded-index multimode fibers. Physical Review A, 2018, 97 (2), ⟨10.1103/PhysRevA.97.023803⟩. ⟨hal-02384714⟩