An Enhanced Method of PTP Fiber Cascade Fine Time-frequency Synchronization

Abstract

In this paper, an enhanced method of PTP fiber cascade fine time-frequency synchronization is proposed. Based on the PTP synchronization technology, combined with the synchronous Ethernet clock transfer technology and the multi-level cascade fine clock synchronization technology based on the digital double mixing time difference method, the PTP technology is improved and enhanced. Then, based on this method, the multi-level time-frequency equipment fiber cascade is used to realize the multi node, large-span and networked time-frequency signal transmission and synchronous output can solve the problem that the synchronization accuracy deteriorates step by step under the condition of multi-level cascade, realizing the ns level system time synchronization accuracy, and ensuring the efficient synchronization and linkage of all parts of the system under the highly unified time scale. The feasibility and effectiveness of the method are verified by design and test.