A feasibility engineering verification scheme of a modified model for Sagnac Effect time deviation in long-distance time transfer via fiber link

Abstract

In the fiber-based time transfersystem, although the rounting position of the employed optical fiber link has been fixed, the actual propagation path of optical signal also changes as a results of the the rotation of the earth during the propagation process. Therefore, the Sagnac effect caused by the rotation of the earth will cause the bidirectional propagation time delay asymmetry, which brings delay deviation to the time transfer and affects the time synchronization accuracy index, especially in the long-distance optical fiber time transfer process [1], [2]. Since actual engineering test for the time deviation caused by the Sagnac effect is barely investigated, this paper provides a feasibility engineering verification scheme for the modified Model of Sagnac effect induced time deviation in long-distance time transfer via fiber link. Based on the comparison between the theoretical value and the measured value of the Sagnac effect time deviation at each remote site, the accuracy and perfectness of the Sagnac effect time deviation correction model in long-distance fiber-based time transmission can be verified. Through the combination of algorithms and measured data, the engineering adaptability of the theoretical model will also be improved.