In order to meet the increasing requirement of accurate time synchronization in the “single-fiber one-way” fiber optic WDM-network, a one-way dual wavelength time transfer scheme based on the temperature-induced variations of group velocity dispersion (TIVGVD) is proposed. We set up a model of one-way time transfer by using time delay difference of dual wavelength to reversely derive the one-way delay variations with the help of Sellmeier expression. The influence of wavelength difference and temperature on one-way delay variationsis simulated and analyzed. The impact of wavelength drift and temperature estimation error on measurement accuracy is studied, which provides quantitative guidance on experimental research and application of one-way time transfer.
The relationship between the time deviation introduced by dispersion and the location of remote stations in ring fiber network is studied in this paper. A method is proposed that the location of remote stations in ring fiber network can be sensed by the remote stations, and compensation can be calculated to adjust the convergence position of the recovered 1PPS signal. We demonstrate a time dissemination experiment via 100km ring fiber network to study the correction method of asymmetry deviation introduced by dispersion. After the calibration of the deviation, time synchronization accuracy of 100ps is realized. Synchronized remote stations can be accessed at anywhere in the ring fiber network.
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