Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection

Abstract The phase noise of microwaves extracted from optical frequency combs is fundamentally limited by thermal and shot noise, which is inherent in photodetection. Saturation of a photodiode due to the high peak power of ultrashort optical pulses, however, prohibits further scaling of white phase...

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Autores principales:	Minji Hyun, Chan-Gi Jeon, Jungwon Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9a6821ad48bf470c8f62cfeec7229b95
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spelling	oai:doaj.org-article:9a6821ad48bf470c8f62cfeec7229b952021-12-02T17:41:18ZUltralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection10.1038/s41598-021-97378-12045-2322https://doaj.org/article/9a6821ad48bf470c8f62cfeec7229b952021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97378-1https://doaj.org/toc/2045-2322Abstract The phase noise of microwaves extracted from optical frequency combs is fundamentally limited by thermal and shot noise, which is inherent in photodetection. Saturation of a photodiode due to the high peak power of ultrashort optical pulses, however, prohibits further scaling of white phase noise by increasing incident optical power. Here we demonstrate that the photocurrent pulse shaping via balanced photodetection, which is accomplished by replacing a single photodiode with a balanced photodetector (BPD) and delaying one of the optical pulses, provides a simple and efficient optical-to-electrical interface to increase achievable microwave power and reduces the corresponding thermal noise-limited phase noise by 6-dB. By analysing contributing noise sources, we also show that the thermal noise floor can reach − 166 dBc/Hz even at a low photocurrent of 2-mA (4-mW optical input per photodiode) when using a p-i-n BPD. This finding may be useful for on-chip microwave generation, which consists of standard p-i-n structure photodiodes with relatively low saturation optical power.Minji HyunChan-Gi JeonJungwon KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Minji Hyun Chan-Gi Jeon Jungwon Kim Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
description	Abstract The phase noise of microwaves extracted from optical frequency combs is fundamentally limited by thermal and shot noise, which is inherent in photodetection. Saturation of a photodiode due to the high peak power of ultrashort optical pulses, however, prohibits further scaling of white phase noise by increasing incident optical power. Here we demonstrate that the photocurrent pulse shaping via balanced photodetection, which is accomplished by replacing a single photodiode with a balanced photodetector (BPD) and delaying one of the optical pulses, provides a simple and efficient optical-to-electrical interface to increase achievable microwave power and reduces the corresponding thermal noise-limited phase noise by 6-dB. By analysing contributing noise sources, we also show that the thermal noise floor can reach − 166 dBc/Hz even at a low photocurrent of 2-mA (4-mW optical input per photodiode) when using a p-i-n BPD. This finding may be useful for on-chip microwave generation, which consists of standard p-i-n structure photodiodes with relatively low saturation optical power.
format	article
author	Minji Hyun Chan-Gi Jeon Jungwon Kim
author_facet	Minji Hyun Chan-Gi Jeon Jungwon Kim
author_sort	Minji Hyun
title	Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
title_short	Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
title_full	Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
title_fullStr	Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
title_full_unstemmed	Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
title_sort	ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9a6821ad48bf470c8f62cfeec7229b95
work_keys_str_mv	AT minjihyun ultralownoisemicrowaveextractionfromopticalfrequencycombsusingphotocurrentpulseshapingwithbalancedphotodetection AT changijeon ultralownoisemicrowaveextractionfromopticalfrequencycombsusingphotocurrentpulseshapingwithbalancedphotodetection AT jungwonkim ultralownoisemicrowaveextractionfromopticalfrequencycombsusingphotocurrentpulseshapingwithbalancedphotodetection
_version_	1718379719087357952

Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection

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