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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sherif S. Sherif, Sherif S. Sherif, Carla C. Rosa, Carla C. Rosa, Adrian G. Podoleanu, 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); doi: 10.1117/12.643852; https://doi.org/10.1117/12.643852


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