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Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Recent progress in ultra low phase noise microwave generation indispensably depends on ultra low phase noise characterization systems. However, achieving high sensitivity currently relies on time consuming averaging via cross correlation, which sometimes even underestimates phase noise because of re...

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Autores principales: Kuse, N., Fermann, M. E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5460219/
https://www.ncbi.nlm.nih.gov/pubmed/28588194
http://dx.doi.org/10.1038/s41598-017-03049-5
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author Kuse, N.
Fermann, M. E.
author_facet Kuse, N.
Fermann, M. E.
author_sort Kuse, N.
collection PubMed
description Recent progress in ultra low phase noise microwave generation indispensably depends on ultra low phase noise characterization systems. However, achieving high sensitivity currently relies on time consuming averaging via cross correlation, which sometimes even underestimates phase noise because of residual correlations. Moreover, extending high sensitivity phase noise measurements to microwaves beyond 10 GHz is very difficult because of the lack of suitable high frequency microwave components. In this work, we introduce a delayed self-heterodyne method in conjunction with sensitivity enhancement via the use of higher order comb modes from an electro-optic comb for ultra-high sensitivity phase noise measurements. The method obviates the need for any high frequency RF components and has a frequency measurement range limited only by the bandwidth (100 GHz) of current electro-optic modulators. The estimated noise floor is as low as −133 dBc/Hz, −155 dBc/Hz, −170 dBc/Hz and −171 dBc/Hz without cross correlation at 1 kHz, 10 kHz, 100 kHz and 1 MHz Fourier offset frequency for a 10 GHz carrier, respectively. Moreover, since no cross correlation is necessary, RF oscillator phase noise can be directly suppressed via feedback up to 100 kHz frequency offset.
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spelling pubmed-54602192017-06-06 Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves Kuse, N. Fermann, M. E. Sci Rep Article Recent progress in ultra low phase noise microwave generation indispensably depends on ultra low phase noise characterization systems. However, achieving high sensitivity currently relies on time consuming averaging via cross correlation, which sometimes even underestimates phase noise because of residual correlations. Moreover, extending high sensitivity phase noise measurements to microwaves beyond 10 GHz is very difficult because of the lack of suitable high frequency microwave components. In this work, we introduce a delayed self-heterodyne method in conjunction with sensitivity enhancement via the use of higher order comb modes from an electro-optic comb for ultra-high sensitivity phase noise measurements. The method obviates the need for any high frequency RF components and has a frequency measurement range limited only by the bandwidth (100 GHz) of current electro-optic modulators. The estimated noise floor is as low as −133 dBc/Hz, −155 dBc/Hz, −170 dBc/Hz and −171 dBc/Hz without cross correlation at 1 kHz, 10 kHz, 100 kHz and 1 MHz Fourier offset frequency for a 10 GHz carrier, respectively. Moreover, since no cross correlation is necessary, RF oscillator phase noise can be directly suppressed via feedback up to 100 kHz frequency offset. Nature Publishing Group UK 2017-06-06 /pmc/articles/PMC5460219/ /pubmed/28588194 http://dx.doi.org/10.1038/s41598-017-03049-5 Text en © The Author(s) 2017 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/.
spellingShingle Article
Kuse, N.
Fermann, M. E.
Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
title Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
title_full Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
title_fullStr Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
title_full_unstemmed Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
title_short Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
title_sort electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5460219/
https://www.ncbi.nlm.nih.gov/pubmed/28588194
http://dx.doi.org/10.1038/s41598-017-03049-5
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