Abstract

This paper introduces a short distance two-way frequency transfer experiment in free space. We carried out two-way frequency transfer experiments on 8 m free space link in the laboratory. When the integration time is 1s, the frequency stability of two-way frequency transfer is $1.43\times 10^{-15}$ . When the integration time is 4000s, the frequency stability increases to $1.13\times 10^{-17}$ . The frequency stability of two-way frequency transfer is higher than that of free space frequency transfer without compensation. This proves that two-way frequency transfer technology can passively offset the frequency fluctuations introduced by links.

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