Frequency transfer via a two-way optical phase comparison on a multiplexed fiber network

Abstract

We performed a two-way remote optical phase comparison on optical fiber. Two optical frequency signals were launched in opposite directions in an optical fiber and their phases were simultaneously measured at the other end. In this technique, the fiber noise was passively cancelled, and we compared two optical frequencies at the ultimate 1E-21 stability level. The experiment was performed on a 47 km fiber that is part of the metropolitan network for Internet traffic. The technique relies on the synchronous measurement of the optical phases at the two ends of the link, that is made possible by the use of digital electronics. This scheme offers several advantages with respect to active noise cancellation, and can be upgraded to perform more complex tasks.

References in corpus (4)

• Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network
• Cascaded multiplexed optical link on a telecommunication network for frequency dissemination
• Time transfer through optical fibers over a distance of 73 km with an uncertainty below 100 ps
• A Large Area Fiber Optic Gyroscope on multiplexed fiber network

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