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

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