As the growing needs of data transmission rate and reliability in oil field production, synchronous digital hierarchy (SDH) fiber optic network is applied to offshore oil fields. We introduce such a new fiber optic network technology from two aspects, i.e., network structure and self-healing ring network, and frame structure and transmission rate. The design method, optical fiber design and design of optical terminal equipment are analyzed using the CFD11 project as an example. Through the successful application in the project, we draw a conclusion that the SDH technology is completely applicable to offshore oil and gas fields.