KEYWORDS: Fiber optics, Signal processing, Optical fibers, Temperature metrology, Optical engineering, Signal generators, Lutetium, Communication engineering, Bandpass filters, Solids
In fiber-optic radio frequency (RF) transfer systems, frequency crosstalk, which contains fiber-induced phase fluctuations under temperature variation, may arise in measurement and the compensation process and degrade the stability of the transferred RF signal. The impact of frequency crosstalk on RF transfer performance is researched under fiber temperature variation. The stability degradation caused by frequency crosstalk is quantitatively analyzed by simulation. The results indicate that the degradation peak is linearly dependent on the crosstalk factor, and the peak position scales with the inverse of RF frequency on the timeline. An experiment is performed based on an RF transfer system with different crosstalk factors, and the measured results agree well with the simulation. For the specified parameters, we provide quantitative guidance on crosstalk isolation requirement for lossless RF transfer, which has great practical significance in predicting and optimizing the performance of a fiber-optic RF transfer system.
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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