Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection

Abstract Optical coherence tomography (OCT) has been utilized in a rapidly growing number of clinical and scientific applications. In particular, swept source OCT (SS-OCT) has attracted many attentions due to its excellent performance. So far however, the limitations of existing photon detectors hav...

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Autores principales:	Vala Fathipour, Tilman Schmoll, Alireza Bonakdar, Skylar Wheaton, Hooman Mohseni
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2eddbd34c11f4b0ab96b65b832f47ef7
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spelling	oai:doaj.org-article:2eddbd34c11f4b0ab96b65b832f47ef72021-12-02T16:06:57ZDemonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection10.1038/s41598-017-01339-62045-2322https://doaj.org/article/2eddbd34c11f4b0ab96b65b832f47ef72017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01339-6https://doaj.org/toc/2045-2322Abstract Optical coherence tomography (OCT) has been utilized in a rapidly growing number of clinical and scientific applications. In particular, swept source OCT (SS-OCT) has attracted many attentions due to its excellent performance. So far however, the limitations of existing photon detectors have prevented achieving shot-noise-limited sensitivity without using balanced-detection scheme in SS-OCT, even when superconducting single-photon detectors were used. Unfortunately, balanced-detection increases OCT system size and cost, as it requires many additional components to boost the laser power and maintain near ideal balanced performance across the whole optical bandwidth. Here we show for the first time that a photon detector is capable of achieving shot noise limited performance without using the balanced-detection technique in SS-OCT. We built a system using a so-called electron-injection photodetector, with a cutoff-wavelength of 1700 nm. Our system achieves a shot-noise-limited sensitivity of about −105 dB at a reference laser power of ~350 nW, which is more than 30 times lower laser power compared with the best-reported results. The high sensitivity of the electron-injection detector allows utilization of micron-scale tunable laser sources (e.g. VCSEL) and eliminates the need for fiber amplifiers and highly precise couplers, which are an essential part of the conventional SS-OCT systems.Vala FathipourTilman SchmollAlireza BonakdarSkylar WheatonHooman MohseniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Vala Fathipour Tilman Schmoll Alireza Bonakdar Skylar Wheaton Hooman Mohseni Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection
description	Abstract Optical coherence tomography (OCT) has been utilized in a rapidly growing number of clinical and scientific applications. In particular, swept source OCT (SS-OCT) has attracted many attentions due to its excellent performance. So far however, the limitations of existing photon detectors have prevented achieving shot-noise-limited sensitivity without using balanced-detection scheme in SS-OCT, even when superconducting single-photon detectors were used. Unfortunately, balanced-detection increases OCT system size and cost, as it requires many additional components to boost the laser power and maintain near ideal balanced performance across the whole optical bandwidth. Here we show for the first time that a photon detector is capable of achieving shot noise limited performance without using the balanced-detection technique in SS-OCT. We built a system using a so-called electron-injection photodetector, with a cutoff-wavelength of 1700 nm. Our system achieves a shot-noise-limited sensitivity of about −105 dB at a reference laser power of ~350 nW, which is more than 30 times lower laser power compared with the best-reported results. The high sensitivity of the electron-injection detector allows utilization of micron-scale tunable laser sources (e.g. VCSEL) and eliminates the need for fiber amplifiers and highly precise couplers, which are an essential part of the conventional SS-OCT systems.
format	article
author	Vala Fathipour Tilman Schmoll Alireza Bonakdar Skylar Wheaton Hooman Mohseni
author_facet	Vala Fathipour Tilman Schmoll Alireza Bonakdar Skylar Wheaton Hooman Mohseni
author_sort	Vala Fathipour
title	Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection
title_short	Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection
title_full	Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection
title_fullStr	Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection
title_full_unstemmed	Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection
title_sort	demonstration of shot-noise-limited swept source oct without balanced detection
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2eddbd34c11f4b0ab96b65b832f47ef7
work_keys_str_mv	AT valafathipour demonstrationofshotnoiselimitedsweptsourceoctwithoutbalanceddetection AT tilmanschmoll demonstrationofshotnoiselimitedsweptsourceoctwithoutbalanceddetection AT alirezabonakdar demonstrationofshotnoiselimitedsweptsourceoctwithoutbalanceddetection AT skylarwheaton demonstrationofshotnoiselimitedsweptsourceoctwithoutbalanceddetection AT hoomanmohseni demonstrationofshotnoiselimitedsweptsourceoctwithoutbalanceddetection
_version_	1718384766876647424

Demonstration of Shot-noise-limited Swept Source OCT Without Balanced Detection

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