Frequency comb-to-comb synchronization between a 1.3-km free-space link via an optical frequency transfer

Jaewon Yang; Dong-IL Lee; Dong-Chel Shin; Jaehyun Lee; Seung-Woo Kim; Young-Jin Kim

doi:10.1117/12.3001516

12 March 2024 Frequency comb-to-comb synchronization between a 1.3-km free-space link via an optical frequency transfer

Jaewon Yang, Dong-IL Lee, Dong-Chel Shin, Jaehyun Lee, Seung-Woo Kim, Young-Jin Kim

Author Affiliations +

Proceedings Volume 12877, Free-Space Laser Communications XXXVI; 1287708 (2024) https://doi.org/10.1117/12.3001516
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Optical frequency comb technology has been revolutionizing optical fields of ultra-precision metrology over two decades, connecting the SI unit standards of various optical clocks with utmost accuracy and stability. With an increasing demand for free-space communication and time/frequency transfer applications, the frequency comb is stretching its versatility even the outside of laboratory. Still, the environmental disturbances of free space degrade the excellent phase noise of the optical frequencies, hindering the reliable utilization of frequency comb at any desirable location. This research performs comb-to-comb synchronization over a 1.3-km Free-Space Optical link (FSO) with frequency stability of 3.80×10^-15 at 0.1 s averaging time throughout the entire comb spectrum. Phase-locked loop compensates the Doppler shift of optical frequencies propagating atmospheric free-space channel, providing optical references for synchronizing distant frequency comb.

Conference Presentation

Citation Download Citation

Jaewon Yang, Dong-IL Lee, Dong-Chel Shin, Jaehyun Lee, Seung-Woo Kim, and Young-Jin Kim "Frequency comb-to-comb synchronization between a 1.3-km free-space link via an optical frequency transfer", Proc. SPIE 12877, Free-Space Laser Communications XXXVI, 1287708 (12 March 2024); https://doi.org/10.1117/12.3001516

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