Digital output compensation for precise frequency transfer over commercial fiber link

Abstract

An ultra-highly precise and long-term stable frequency transmission system over 120 km commercial fiber link has been proposed and experimentally demonstrated. This system is based on digital output compensation technique to suppress phase fluctuations during the frequency transmission process. A mode-locked erbium-doped fiber laser driven by a hydrogen maser serves as an optical transmitter. Moreover, a dense wavelength division multiplexing system is able to separate forward and backward signals with reflection effect excluded. The ultimate fractional frequency instabilities for the long-distance frequency distributed system are up to 3.14×10^-15 at 1 s and 2.96×10^-19 at 10 000 s, respectively.

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This work has been supported by the National Natural Science Foundation of China (Nos.61571244 and 61501262), the Science and Technology Project of Tianjin (No.16YFZCSF00540), and the Natural Science Foundation of Tianjin (No.15JCYBJC51600).