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

Sherif, Sherif S. and Rosa, Carla C. and Podoleanu, Adrian G. (2005) Instantaneous signal-to-noise ratio of time-domain optical coherence tomography. In: Optical Coherence Tomography and Coherence Techniques II. Proceedings of SPIE . SPIE. (doi:10.1117/12.643852) (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/10.1117/12.643852

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.

Item Type: Book section
DOI/Identification number: 10.1117/12.643852
Uncontrolled keywords: Optical coherence tomography, Shot noise, Statistical optics, Acoustic noise, Polarization, Random processes, Shot noise, Statistical optics, Tomography, Wave filters, Optical coherence tomography, Optical power, Photoelectron noise, Signal-to-noise ratio, Photocurrents
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 15:05 UTC
Last Modified: 26 Jul 2019 13:25 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49758 (The current URI for this page, for reference purposes)
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