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Avalanche photodiode based optical coherence tomography

Cernat, Ramona, Podoleanu, Adrian G.H., Gnewuch, H. (2004) Avalanche photodiode based optical coherence tomography. In: SPIE Proceedings Series. Proceedings of SPIE - The International Society for Optical Engineering. 5459. pp. 185-191. Spie-Int Soc Optical Engineering (doi:10.1117/12.545421) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1117/12.545421

Abstract

Optical Coherence Tomography (OCT) is used to perform in vivo high-resolution imaging of biological tissue microstructures. In the present study, we evaluate the optimum conditions to use Avalanche photodiodes (APDs) in OCT to achieve maximum signal-to-noise (S/N) ratios. The optical sources employed in OCT have a large bandwidth. Due to beating within the source line-width, excess photon noise (EPN) is generated in addition to shot noise (SN). Usually, high speed OCT requires large optical power, which makes the EPN to dominate over the SN. Therefore, balanced detection is used to reduce the EPN. We analyse the optimisation of the OCT configuration with respect to the APD noise performance. When using APDs, another parameter has to be considered in the S/N analysis: that of the voltage across the APDs, which determines, both, the gain and the noise.

Item Type: Conference or workshop item (Proceeding)
DOI/Identification number: 10.1117/12.545421
Uncontrolled keywords: Avalanche photodiode, Excess photon noise, Optical coherence tomography, Silicon pin photodiode, Acoustic noise, Demodulation, Electric potential, Imaging techniques, Photodetectors, Photodiodes, Tomography, Avalanche photodiode (APD), Excess photon noise (EPN), Optical coherence tomography (OCT), Silicon pin photodiode, Coherent light
Subjects: Q Science > QC Physics
R Medicine > R Medicine (General) > R857.O6 Optical coherence tomography
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Giles Tarver
Date Deposited: 24 Jul 2015 15:43 UTC
Last Modified: 29 May 2019 14:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49774 (The current URI for this page, for reference purposes)
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