We predict that a photonic crystal fiber whose strands are filled with a defocusing nonlinear medium can support stable bright solitons and also vortex solitons if the strength of the defocusing nonlinearity grows toward the periphery of the fiber. The domains of soliton existence depend on the transverse growth rate of the filling nonlinearity and nonlinearity of the core. Remarkably, solitons exist even when the core material is linear.
© 2012 Optical Society of America
Original Manuscript: February 22, 2012
Manuscript Accepted: March 21, 2012
Published: May 17, 2012
Valery E. Lobanov, Olga V. Borovkova, Yaroslav V. Kartashov, Boris A. Malomed, and Lluis Torner, "Stable bright and vortex solitons in photonic crystal fibers with inhomogeneous defocusing nonlinearity," Opt. Lett. 37, 1799-1801 (2012)