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arXiv · 1406.4223

Temperature Effect and Correction Method of White Rabbit Timing Link

Hongming Li·Guanghua Gong·Weibin Pan·Qiang Du·Jianmin Li
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Abstract

To guarantee the angular resolution, the Large High Altitude Air Shower Observatory (LHAASO) requires a 500ps (rms) timing synchronization among the 6866 detect units for its KM2A sub-detector array. The White Rabbit technology is applied which combines sub-nanosecond precision timing transfer and gigabit Ethernet data transfer over the same fiber media. Deployed on a wild field at 4300m a.s.l. altitude, the WR network must maintain the precision over a wide temperature range. The temperature effect on a small WR link is measured, and contributions from different components like optical fiber, SFP module, fixed delay on PCB and ICs are separately studied and analyzed. An online real-time temperature correction method was applied based on the result which significantly reduce the synchronization variation from 300 ps to 50 ps in a temperature range of 50 degrees centigrade.

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Hongming Li, Guanghua Gong, Weibin Pan, Qiang Du, Jianmin Li. 2014-06-17. Temperature Effect and Correction Method of White Rabbit Timing Link. https://arxiv.org/abs/1406.4223

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