Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link

Jaewon Yang; Dong IL Lee; Dong-Chel Shin; Jaehyun Lee; Byung Soo Kim; Hyun Jay Kang; Young-Jin Kim; Seung-Woo Kim

doi:10.1038/s41377-022-00940-3

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Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link

Original Articles

- Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link
- Light: Science & Applications Vol. 11, Issue 9, Pages: 2207-2216(2022)
- Affiliations：
  
  1.Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
  2.Presently with Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
- Author bio：
  
  Young-Jin Kim (yj.kim@kaist.ac.kr)
  Seung-Woo Kim (swk@kaist.ac.kr)
- Funds：
- DOI：10.1038/s41377-022-00940-3
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Yang, J. et al. Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link. Light: Science & Applications, 11, 2207-2216 (2022).
DOI：

Yang, J. et al. Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link. Light: Science & Applications, 11, 2207-2216 (2022). DOI： 10.1038/s41377-022-00940-3.

摘要

Abstract

Stabilizing a frequency comb to an ultra-stable optical frequency reference requires a multitude of optoelectronic peripherals that have to operate under strict ambient control. Meanwhile, the frequency comb-to-comb stabilization aims to synchronize a slave comb to a well-established master comb with a substantial saving in required equipment and efforts. Here, we report an utmost case of frequency comb-to-comb stabilization made through a 1.3 km free-space optical (FSO) link by coherent transfer of two separate comb lines along with a feedback suppression control of atmospheric phase noise. The FSO link offers a transfer stability of 1.7 × 10,–15, at 0.1 s averaging, while transporting the master comb's stability of 1.2 × 10,–15, at 1.0 s over the entire spectrum of the slave comb. Our remote comb-to-comb stabilization is intended to expedite diverse long-distance ground-to-ground or ground-to-satellite applications; as demonstrated here for broadband molecular spectroscopy over a 6 THz bandwidth as well as ultra-stable microwaves generation with phase noise of -80 dBc Hz,–1, at 1 Hz.

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