In Software-Defined Flexible Bandwidth Optical Networks（SD-FBONs）

the energy-efficiency problems have to be solved in order to meet the requirements of the green and energy-saving optical networks. In this paper

considering the programmable characteristics of optical switching nodes

the service architecture of SD-FBONs is flexibly operated by the network center controller and application layer controller based on the extended OpenFlow protocol. An Energy-Optimized Mixed-Line-Rate Dedicated Protection Approach（EO-MLR-DPA） is proposed to reduce the energy consumption

and the Traditional Dedicated Protection Approach（T-DPA） is introduced for comparison in SD-FBONs. The simulation results show that

compared with T-DPA

the proposed EO-MLR-DPA can effectively reduce the power consumption and optimize the configuration of the optical transponder and optical regenerator under different line rates and modulation formats in SD-FBONs.