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Proceedings Paper

Instantaneous signal-to-noise ratio of time-domain optical coherence tomography
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Paper Abstract

We model the photocurrent of a depth-scan (A-scan) from an optical coherence tomography (OCT) system, using a linearly polarized thermal source, as an electronically filtered doubly-stochastic Poisson process, and we obtain its time-varying second-order statistics. We derive an expression for the instantaneous signal-to-noise ratio (SNR) of time-domain OCT which is more general than the previously reported time-averaged expressions. Unlike previous work, our analysis combines shot noise, due to detection of coherent light, and photon excess noise, due to fluctuations in the optical field, into a single noise source that we refer to as the photoelectron noise. Similar to previous results, our SNR is dominated by a term similar to shot-noise when the reference optical power is low and by a term similar to photon excess noise when the reference power is high.

Paper Details

Date Published: 7 October 2005
PDF: 5 pages
Proc. SPIE 5861, Optical Coherence Tomography and Coherence Techniques II, 58611C (7 October 2005); doi: 10.1117/12.643852
Show Author Affiliations
Sherif S. Sherif, Univ. of Kent (United Kingdom)
Carla C. Rosa, Univ. of Kent (United Kingdom)
Adrian G. Podoleanu, Univ. of Kent (United Kingdom)

Published in SPIE Proceedings Vol. 5861:
Optical Coherence Tomography and Coherence Techniques II
Wolfgang Drexler, Editor(s)

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