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White Rabbit Precision Time Protocol on Long-Distance Fiber Links.

Erik F Dierikx, Anders E Wallin, Thomas Fordell

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 19, 2016

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White Rabbit Precision Time Protocol (WR-PTP) was tested in long-distance fiber links up to 950 km. The WR-PTP achieved sub-nanosecond agreement with GPS timing over three months, demonstrating its potential for precise time synchronization.

Area of Science:

Networking and Telecommunications
Precision Time Transfer
Optical Fiber Systems

Background:

White Rabbit Precision Time Protocol (WR-PTP) is designed for synchronizing equipment in synchronous Ethernet networks, typically within 10 km.
Existing communication fiber networks offer potential infrastructure for extending WR-PTP capabilities.

Purpose of the Study:

Investigate the application and limitations of WR-PTP in long-distance optical fiber links.
Evaluate WR-PTP performance in real-world communication networks beyond its original intended range.

Main Methods:

Implemented WR-PTP over a 950-km unidirectional fiber link (Espoo-Kajaani, Finland) and compared it with GPS Precise Point Positioning (PPP).
Implemented WR-PTP over two cascaded 137-km bidirectional fiber links (Delft-Amsterdam, Netherlands).

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Analyzed time transfer accuracy and identified sources of uncertainty, such as chromatic dispersion.

Main Results:

The 950-km WR-PTP link showed agreement within [Formula: see text] compared to GPS PPP over three months.
The 274-km cascaded link achieved a time offset within 5 ns with 8 ns uncertainty.
Chromatic dispersion was identified as a primary factor contributing to delay asymmetry and uncertainty in bidirectional links.

Conclusions:

WR-PTP can be successfully applied to long-distance optical fiber links, significantly extending its operational range.
The protocol demonstrates high accuracy and stability for time transfer over extended fiber networks.
Further research is needed to mitigate dispersion effects for enhanced performance in bidirectional fiber links.