Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2020 Jan 17;11:374. doi: 10.1038/s41467-019-14059-4

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Fig. 1 — for optical-to-microwave frequency division. a Schematic illustration of the transfer oscillator applied to a Kerr comb (or electro-optic combs equivalently). b Schematic representation of the signal evolution along the electronic division chain leading to the low-noise output signal. The two comb parameters f_CEO and f_rep are detected. Both parameters can be free-running and fluctuate. The carrier envelope offset (CEO) frequency is electronically divided by a large number N that corresponds to the tooth number of the ultra-stable pump ν_USL. After this step, the frequency fluctuations of the divided CEO f_CEO∕N = ν_USL∕N − f_rep are dominated by the repetition rate fluctuations. These are removed by mixing f_CEO∕N with f_rep to obtain the division result ν_USL∕N. A narrow-band filtering is used to reject spurs.