Stabilized Free-Space Optical Frequency Transfer
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TL;DR: In this paper, a continuous-wave coherent link can exceed the fractional frequency stability of frequency-comb methods by an order of magnitude, and the technical hurdles to implement such links over the distances required to reach low Earth orbit are highlighted.
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Abstract: High-precision optical frequency transfer through free-space links will enable advances in fields ranging from coherent optical communication and satellite Doppler ranging, to tests of general relativity and fundamental physics. Previous work has focused on two-way time and frequency transfer techniques using optical frequency combs. Here the authors show that a continuous-wave coherent link can exceed the fractional frequency stability of frequency-comb methods by an order of magnitude. They also highlight and discuss the technical hurdles to implementing similar links over the distances required to reach low Earth orbit.
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Citations
Point-to-Point Stabilised Optical Frequency Transfer with Active Optics
Benjamin P. Dix-Matthews,Sascha Schediwy,David R. Gozzard,Etienne Savalle,Francois-Xavier Esnault,Thomas Leveque,Charles Gravestock,Darlene D’Mello,Skevos F. E. Karpathakis,Michael E. Tobar,Peter Wolf +10 more
TL;DR: In this paper, the authors demonstrate phase stabilized optical frequency transfer over a 265 m horizontal point-to-point free-space link between optical terminals with active tip-tilt mirrors to suppress beam wander, in a compact, human-portable setup.
•Posted Content
Ultra-stable Free-Space Laser Links for a Global Network of Optical Atomic Clocks
David R. Gozzard,L. A. Howard,Benjamin P. Dix-Matthews,Skevos F. E. Karpathakis,Charles Gravestock,Sascha Schediwy +5 more
TL;DR: In this article, the authors demonstrate frequency transfer over a 2.4 km atmospheric link with turbulence similar to that of a ground-to-space link, achieving a fractional frequency stability of 6.1E-21 in 300 s of integration time.
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Free-space transfer of comb-rooted optical frequencies over an 18 km open-air link
Hyun Jay Kang,Jaewon Yang,Byung Jae Chun,Byung Jae Chun,Byung Jae Chun,Heesuk Jang,Heesuk Jang,Byung Soo Kim,Young-Jin Kim,Young-Jin Kim,Seung-Woo Kim +10 more
TL;DR: The authors demonstrate the parallel transmission of multiple optical carriers in air up to 18 km using a stable near-infrared frequency comb and an add-on demonstration is given for multi-channel coherent optical communications with the potential of multi-Tbps data transmission in free space.
Optical time-frequency transfer across a free-space, three-node network
Martha I. Bodine,Martha I. Bodine,Jennifer L. Ellis,William C. Swann,Sarah A. Stevenson,Jean-Daniel Deschenes,Emily D. Hannah,Paritosh Manurkar,Paritosh Manurkar,Nathan R. Newbury,Laura C. Sinclair +10 more
- 29 Jul 2020
TL;DR: Frequency-comb-based optical two-way time-frequency transfer across a three-node clock network is demonstrated, allowing the network to span 28 km of turbulent outdoor air while keeping optical transmit powers below 5 mW.
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Measurement of the impact of turbulence anisoplanatism on precision free-space optical time transfer
William C. Swann,Martha I. Bodine,Isaac H. Khader,Jean-Daniel Deschenes,Esther Baumann,Laura C. Sinclair,Nathan R. Newbury +6 more
TL;DR: In this paper, the authors used comb-based optical two-way time-frequency transfer over two spatially separated optical links and found only a modest degradation in the time synchronization and frequency syntonization between two sites, in good agreement with theory.
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