Low phase noise microwave synthesis via an optically stabilized electro-optic frequency comb

Igor S. Kudelin; William Groman; Megan Kelleher; Dahyeon Lee; Alexander Lind; Charles Mclemore; Franklyn Quinlan; Scott Diddams

doi:10.1117/12.2651005

13 March 2023 Low phase noise microwave synthesis via an optically stabilized electro-optic frequency comb

Igor S. Kudelin, William Groman, Megan Kelleher, Dahyeon Lee, Alexander Lind, Charles Mclemore, Franklyn Quinlan, Scott Diddams

Author Affiliations +

Proceedings Volume PC12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI; PC124200M (2023) https://doi.org/10.1117/12.2651005
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

In this work, we propose a novel approach for stabilizing frequency comb for stable microwave generation. This approach does not require stabilization of the offset frequency, but instead employs processing the heterodyne beats from an electro-optic comb and two continuous-wave lasers that are locked to an ultrastable compact cavity. We used a free-running laser and electro-optical modulators to generate a 10 GHz frequency comb spanning over 1.3 THz, matching the frequency separation of the CW lasers. Servo control of the 10 GHz modulation frequency reduces the 10 GHz phase noise to -140 dBc/Hz phase noise at 10 kHz offset frequency. At the same time, the 10 GHz signals show frequency instability at the 10^(-13) level at integration time below 1~s. In ongoing work, we seek to implement the system using integrated laser sources, chip-scale frequency combs and millimeter-scale optical cavities.

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Citation Download Citation

Igor S. Kudelin, William Groman, Megan Kelleher, Dahyeon Lee, Alexander Lind, Charles Mclemore, Franklyn Quinlan, and Scott Diddams "Low phase noise microwave synthesis via an optically stabilized electro-optic frequency comb", Proc. SPIE PC12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI, PC124200M (13 March 2023); https://doi.org/10.1117/12.2651005

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KEYWORDS

Frequency combs

Microwave radiation

Electro optics

Continuous wave operation

Phase shift keying

Servomechanisms

Supercontinuum generation

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