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Proceedings Paper

Avalanche photodiode-based optical coherence tomography
Author(s): Ramona Cernat; Adrian Gh. Podoleanu; Harald W. J. Gnewuch
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Paper 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.

Paper Details

Date Published: 1 September 2004
PDF: 7 pages
Proc. SPIE 5459, Optical Sensing, (1 September 2004); doi: 10.1117/12.545421
Show Author Affiliations
Ramona Cernat, National Institute for Laser, Plasma and Radiation Physics (Romania)
Adrian Gh. Podoleanu, Univ. of Kent (United Kingdom)
Harald W. J. Gnewuch, Univ. of Kent/Canterbury (United Kingdom)

Published in SPIE Proceedings Vol. 5459:
Optical Sensing
Brian Culshaw; Anna Grazia Mignani; Rainer Riesenberg, Editor(s)

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