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Optimization of OCT signal-to-noise ratio, when excess photon noise increases due to mismatch of the balanced receiver

Rosa, C.C., Podoleanu, Adrian G.H. (2004) Optimization of OCT signal-to-noise ratio, when excess photon noise increases due to mismatch of the balanced receiver. In: SPIE Proceedings Series. Proceedings of SPIE - The International Society for Optical Engineering. 5468. pp. 66-73. Spie-Int Soc Optical Engineering (doi:10.1117/12.547006) (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/10.1117/12.547006

Abstract

In optical coherence tomography (OCT), it is often assumed that the signal-to-noise ratio, at higher optical power regimes, is limited by beat noise. Nonetheless it was often noticed that the limiting value could not be experimentally achieved, despite minimizing the stray reflectance and increasing the optical source effective bandwidth. In this work we present a new model for the noise in a balanced OCT configuration, which accounts for the limited spectral response of fiber directional couplers, as well as imperfections in the photo-detectors. As a consequence, and due to different spectrum content between the two balanced-OCT outputs, excess photon noise is larger than previously considered. The model also allows for the determination of SNR optimized parameters for maximum performance of the balanced system, and can be applied to any coupler or broadband source. Results for optimized and non-optimized configurations, for different balanced detection configurations, implemented in an OCT system, are presented and discussed.

Item Type: Conference or workshop item (Proceeding)
DOI/Identification number: 10.1117/12.547006
Uncontrolled keywords: Excess Photon Noise, Imaging systems, Optical Coherence Tomography, Excess photon noise, Optical coherence tomography (OCT), Photonic crystals, Coherent light, Interferometry, Laser mode locking, Optical systems, Optimization, Photodetectors, Photons, Signal receivers, Signal to noise ratio, Tomography, Imaging systems
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 16:13 UTC
Last Modified: 29 May 2019 14:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49787 (The current URI for this page, for reference purposes)
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