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4 March 2019 Frequency comb-based one-way RF frequency transfer across a 880-m-long outdoor atmospheric link with 10-16 instability
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Proceedings Volume 10910, Free-Space Laser Communications XXXI; 109101N (2019) https://doi.org/10.1117/12.2508699
Event: SPIE LASE, 2019, San Francisco, California, United States
Abstract
We introduce RF frequency dissemination and synchronization system through an outdoor 880-m-long beam path with sub-picosecond timing jitter. The 880-m-long link is configured as a round-trip beam path between rooftops of two independent multi-story buildings. The reference RF frequency of 1.25 GHz is extracted from the fifth harmonic component of the 250 MHz optical frequency comb, which is propagated through the turbulent 880-m beam path. Excess phase noise during the propagation is measured by frequency mixing between the reference and transferred RF signals. After the suppression of the excess phase noise by using a voltage controlled phase shifter, we achieved the instability of 4.5×10-13 (1.3×10-16) at 1 (1000) s averaging time in terms of modified Allan deviation. The timing drift measured over 5000 s is 397 fs (rms).
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Junho Shin, Jaegoan Lee, Myoung-Sun Heo, Sang Eon Park, Dai-Hyuk Yu, and Jungwon Kim "Frequency comb-based one-way RF frequency transfer across a 880-m-long outdoor atmospheric link with 10-16 instability", Proc. SPIE 10910, Free-Space Laser Communications XXXI, 109101N (4 March 2019); https://doi.org/10.1117/12.2508699
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