  In this paper, a sliding mode controller is designed to synchronize a chaotic
fractional-order system. To construct a corrective control input, a saturation
function sat(.), with a modified sliding surface is proposed. Finally, Chaos in
the Duffing-Holmes system with fractional orders is investigated, and a
numerical simulation (synchronizing fractional-order Duffing-Holmes _
Duffing-Holmes system) are presented to show the effectiveness of the proposed
controller.
