Jiameng Dong;Zhaohui Wang;Jiayi Dou;Yichen Zhang;Song Yu;Bin Luo
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Two-Way Fiber-Optic Time Synchronization System Based on Feedforward-Feedback Phase Compensation
Synchronizing remote frequency references is critical in two-way fiber-optic time synchronization systems. Without dedicated frequency transfer systems, it can be realized via frequency or phase compensation. However, these standalone compensation methods suffer from excessive parameter dependence or poor mitigation of time-varying frequency differences. Therefore, this letter proposes a feedforward-feedback phase compensation scheme integrating frequency compensation as a proactive method for clock difference drift suppression, overcoming single-method limitations while broadening applicability. The proposed method is validated on a laboratory 400 km two-way time synchronization system with a free-running remote oscillator, achieving 17.47 ps@1 s and 1.3 ps@1000 s, demonstrating its potential for precision time-frequency applications.
期刊介绍:
IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.