A 300-Kilometer Optical Fiber Time Transfer Using Bidirectional TDM Dissemination

Liang Hu, Guiling Wu, Hao Zhang, Jianping Chen

Abstract:	We propose a long-distance high precise time transfer scheme over single optical fiber employing the same wavelengths in both directions. It can suppress the impact of the Rayleigh backscattering and the dispersion-induced symmetric deviation over fiber links at the same time by using bidirectional time division multiplexing (BTDM) mechanism. A single-fiber bidirectional amplifier (SFBA) is also optimized for the proposed scheme. A 300km time transfer over single optical fiber with identical optical wavelengths in both directions is demonstrated. The results show that the bidirectional propagation delay asymmetry is less than 25 ps with fiber link up to 300km without any calibration, which is closed to the floor of the used time interval counters, and almost keep unchanged as the fiber length increases. The measured stabilities in term of TDEV are less than 40ps/s and 11ps/d, respectively.
Published in:	Proceedings of the 46th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 4, 2014 Seaport Boston Hotel Boston, Massachusetts
Pages:	41 - 44
Cite this article:	Hu, Liang, Wu, Guiling, Zhang, Hao, Chen, Jianping, "A 300-Kilometer Optical Fiber Time Transfer Using Bidirectional TDM Dissemination," Proceedings of the 46th Annual Precise Time and Time Interval Systems and Applications Meeting, Boston, Massachusetts, December 2014, pp. 41-44.
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