Abstract
Radio frequency (RF) transmission systems with high-precision phase stability are required by the next generation of particle colliders and light sources. An RF transmission system was designed to meet this requirement. In this system, RF signal generated at the sending end is modulated onto a continuous wave (CW) optical carrier, transmitted through an optical fiber, and demodulated at the receiving end. The phase drift is detected by a digital phase monitor with femtosecond-level accuracy and compensated by a motorized optical fiber delay line (ODL). The measurement results show that the long-term phase drifts can be stabilized to within 100 fs (pk–pk), 500 fs (pk–pk), and 1.8 ps (pk–pk) in a 400-meter-long optical fiber over 1 h, 24 h, and 10 days, respectively.
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