A dual-mode time service method and system based on optical fiber

By embedding signal quality monitoring and in-band backhaul mechanisms at the relay nodes of the fiber optic link, the link health is evaluated in real time, and a dual-mode time synchronization method is implemented. This solves the problem of decreased synchronization accuracy of fiber optic time synchronization technology under link delay asymmetry fluctuations and faults, ensuring the stability of clock synchronization and the timeliness of fault recovery.

CN122431074APending Publication Date: 2026-07-21王昊晨
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
王昊晨
Filing Date
2026-05-28
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing fiber optic time synchronization technology suffers from decreased synchronization accuracy and lacks a smooth switching mechanism under conditions of asymmetric fluctuations in link delay and failures, resulting in unstable clock synchronization accuracy and untimely fault recovery.

Method used

By embedding signal quality monitoring and in-band backhaul mechanisms at fiber optic link relay nodes, an in-band monitoring data stream is generated to assess link health in real time, enabling a dual-mode time synchronization method. This allows for smooth switching between time synchronization modes and the generation of synthetic time compensation quantities by combining local clock information, ensuring the stability of clock synchronization.

Benefits of technology

It achieves smooth mode switching in the event of link anomalies, mitigates clock accuracy divergence, and sets up a hierarchical protection system to ensure the stability of clock synchronization and the timeliness of fault recovery.

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Abstract

The application relates to the field of dual-mode time service technology of optical fibers, in particular to a dual-mode time service method and system based on optical fibers. The method is realized based on a dual-mode time service system and is characterized in that the following steps are included: at a master time service node, a standard time signal is modulated onto an optical carrier to generate an optical time service signal containing time encoding information, and the optical time service signal is transmitted to a slave time service node through an optical fiber link; meanwhile, at selected relay nodes of the optical fiber link. The application embeds signal quality monitoring and in-band backhaul mechanisms at each relay node, constructs a monitoring data stream transmitted along the same path as the time service signal, enables the slave time service node to obtain real-time physical layer parameters of each relay node distributed on the whole link, provides a data basis for accurate evaluation of the global link health degree, and adopts a parallel architecture for mode decision and a time service process, so that the system has no detection blind area for response to changes in the link state, and the timeliness of mode switching is ensured.
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