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

Sherif S. Sherif; Carla C. Rosa; Adrian G. Podoleanu

doi:10.1117/12.643852

7 October 2005 Instantaneous signal-to-noise ratio of time-domain optical coherence tomography

Sherif S. Sherif, Carla C. Rosa, Adrian G. Podoleanu

Proceedings Volume 5861, Optical Coherence Tomography and Coherence Techniques II; 58611C (2005) https://doi.org/10.1117/12.643852
Event: European Conferences on Biomedical Optics 2005, 2005, Munich, Germany

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.

Citation Download Citation

Sherif S. Sherif, Carla C. Rosa, and Adrian G. Podoleanu "Instantaneous signal-to-noise ratio of time-domain optical coherence tomography", Proc. SPIE 5861, Optical Coherence Tomography and Coherence Techniques II, 58611C (7 October 2005); https://doi.org/10.1117/12.643852

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KEYWORDS

Signal to noise ratio

Optical coherence tomography

Electronic filtering

Light

Sensors

Signal processing

Imaging systems

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