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Frequency comb-based one-way RF frequency transfer across a 880-m-long outdoor atmospheric link with 10-16 instability
Author(s): Junho Shin; Jaegoan Lee; Myoung-Sun Heo; Sang Eon Park; Dai-Hyuk Yu; Jungwon Kim
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Paper 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).

Paper Details

Date Published: 4 March 2019
PDF: 6 pages
Proc. SPIE 10910, Free-Space Laser Communications XXXI, 109101N (4 March 2019); doi: 10.1117/12.2508699
Show Author Affiliations
Junho Shin, KAIST (Korea, Republic of)
Jaegoan Lee, KAIST (Korea, Republic of)
Myoung-Sun Heo, Korea Research Institute of Standards and Science (Korea, Republic of)
Sang Eon Park, Korea Research Institute of Standards and Science (Korea, Republic of)
Dai-Hyuk Yu, Korea Research Institute of Standards and Science (Korea, Republic of)
Jungwon Kim, KAIST (Korea, Republic of)

Published in SPIE Proceedings Vol. 10910:
Free-Space Laser Communications XXXI
Hamid Hemmati; Don M. Boroson, Editor(s)

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