Abstract

A stable frequency transmission of a phase-shifted frequency signal in an optical fiber link is proposed and experimentally demonstrated using a phase-compensation technique, where phase drift produced by the mechanical stress and temperature acting on the optical fiber link is compensated based on feedback optical signal processing employing a phase modulator. An ultra-stable beam-forming signal conducive to the flexible distribution of phased array radar is obtained at the remote node. The experimental results implement a full 360° phase shift over a frequency range from 10 to 20 GHz through 200 km single-mode fiber, with Allan deviations of ${\sim}{7.65} \times {{10}^{- 17}}$ at average time of 1000 s and a root mean square jitter less than 0.39 ps. The proposed scheme is beneficial to implementation of high-resolution imaging in phased array radar.

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