I. Introduction
With rapid development of software defined network (SDN) technologies, optical networks have achieved great progress toward the programmable ability [1]. Benefiting from great progress of optical communications, the elastic optical network (EON) makes full use of Orthogonal Frequency Division Multiplexing (OFDM) in the optical field. By introducing new types of optical devices with variable bandwidth ability, the EON can provide great support to virtual network services [2]. As one kinds of newly emerged technologies, the network virtual technology allows various logically isolated networks to share the same optical layer network and physical resources.