We show that bimodal systems with a spatially nonuniform defocusing cubic nonlinearity, whose strength grows toward the periphery, can support stable two-component solitons. For a sufficiently strong cross-phase-modulation interaction, vector solitons with overlapping components become unstable, while stable families of solitons with spatially separated components emerge. Stable complexes with separated components may be built not only of fundamental solitons, but of multipoles, too.
© 2011 Optical Society of America
Original Manuscript: September 29, 2011
Manuscript Accepted: October 18, 2011
Published: November 25, 2011
Yaroslav V. Kartashov, Victor A. Vysloukh, Lluis Torner, and Boris A. Malomed, "Self-trapping and splitting of bright vector solitons under inhomogeneous defocusing nonlinearities," Opt. Lett. 36, 4587-4589 (2011)