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Proceedings Paper

Generation of multiple optical frequencies referenced to a frequency comb for precision free-space frequency transfer
Author(s): Byung Jae Chun; Hyun Jay Kang; Young-Jin Kim; Seung-Woo Kim
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Paper Abstract

Generating multiple optical frequencies referenced to the frequency standard is an important task in optical clock dissemination and optical communication. An apparatus for frequency-comb-referenced generation of multiple optical frequencies is demonstrated for high-precision free-space transfer of multiple optical frequencies. The relative linewidth and frequency instability at each channel corresponds to sub-1 Hz and 1.06×10-15 at 10 s averaging time, respectively. During the free-space transfer, the refractive index change of transmission media caused by atmospheric turbulences induces phase and frequency noise on optical frequencies. These phase and frequency noise causes induced linewidth broadening and frequency shift in optical frequencies which can disturb the accurate frequency transfer. The proposed feedback loop with acousto-optic modulator can monitor and compensate phase/frequency noise on optical frequencies. As a result, a frequency-comb-referenced single optical mode is compensated with a high signal to noise ratio (SNR) of 80 dB. By sharing the same optical paths, this feedback loop is confirmed to be successfully transferred to the neighboring wavelength channels (a 100 GHz spaced channel). This result confirms our proposed system can transfer optical frequencies to the remote site in free-space without performance degradation.

Paper Details

Date Published: 15 March 2016
PDF: 7 pages
Proc. SPIE 9739, Free-Space Laser Communication and Atmospheric Propagation XXVIII, 973915 (15 March 2016); doi: 10.1117/12.2212815
Show Author Affiliations
Byung Jae Chun, KAIST (Korea, Republic of)
Nanyang Technological Univ. (Singapore)
Hyun Jay Kang, KAIST (Korea, Republic of)
Young-Jin Kim, Nanyang Technological Univ. (Singapore)
Seung-Woo Kim, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 9739:
Free-Space Laser Communication and Atmospheric Propagation XXVIII
Hamid Hemmati; Don M. Boroson, Editor(s)

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