Multimode Brillouin spectrum in a long tapered birefringent photonic crystal fiber

Joël Cabrel Tchahame (1) , Jean-Charles Beugnot (1) , Alexandre Kudlinski (2) , Thibaut Sylvestre (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
2 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523

We investigate the stimulated Brillouin scattering (SBS) in a long tapered birefringent solid-core photonic crystal fiber (PCF) and compare our results with a similar but untapered PCF. It is shown that the taper generates a broadband and multi-peaked Brillouin spectrum, while significantly increasing the threshold power. Furthermore, we observe that the strong fiber birefringence gives rise to a frequency shift of the Brillouin spectrum which increases along the fiber. Numerical simulations are also presented to account for the taper effect and on the birefringence. Our findings open a new mean to control or inhibit the SBS by tapering photonic crystal fibers.

Domaines: Optique / photonique

Joël Cabrel Tchahame, Jean-Charles Beugnot, Alexandre Kudlinski, Thibaut Sylvestre. Multimode Brillouin spectrum in a long tapered birefringent photonic crystal fiber. Optics Letters, 2015, 40 (18), pp.4281-4284. ⟨10.1364/OL.40.004281⟩. ⟨hal-01198791⟩