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A precise fiber-based time and frequency dissemination scheme for multiple users with a tree-like branching topology is proposed. Through this scheme, ultrastable signals can be easily accessed online without affecting other sites. The scheme is tested through an experiment, in which a modulated frequency signal and a synchronized time signal are transferred to multiple remote sites over delay-stabilized fiber optic links that are over 50 km long. Results show that the relative stabilities are 5 x 10-14at 1 s and 2 x 10-17at 104 s. Meanwhile, compared with each site, time synchronization precision is less than 80 ps. These results can pave the way to practical applications in joint time and frequency dissemination network systems.
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Chen et al. (2015) studied this question.
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