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To guarantee the angular resolution, the Large High Altitude Air ShowerObservatory (LHAASO) requires a 500ps (rms) timing synchronization among the6866 detect units for its KM2A sub-detector array. The White Rabbit technologyis applied which combines sub-nanosecond precision timing transfer and gigabitEthernet data transfer over the same fiber media. Deployed on a wild field at4300m a.s.l. altitude, the WR network must maintain the precision over a widetemperature range. The temperature effect on a small WR link is measured, andcontributions from different components like optical fiber, SFP module, fixeddelay on PCB and ICs are separately studied and analyzed. An online real-timetemperature correction method was applied based on the result whichsignificantly reduce the synchronization variation from 300 ps to 50 ps in atemperature range of 50 degrees centigrade.

Temperature Effect and Correction Method of White Rabbit Timing Link