Limitation of the achievable signal-to-noise ratio in optical coherence tomography due to mismatch of the balanced receiver |
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Authors: | Rosa Carla Carmelo Podoleanu Adrian Gh |
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Affiliation: | Unidade de Optoelectrónica e Sistemas Electrónicos, Instituto de Engenharia de Sistemas e Computadores Porto, Departamento de Física de Faculdade de Ciêncas da Universidade do Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal. |
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Abstract: | Owing to the limited spectral response of the fiber directional coupler used in a balanced optical coherence tomography configuration, the spectra are different in the two outputs. This affects unfavorably operation of the balanced photodetector unit. Excess photon noise makes a larger contribution than a directional coupler with a flat spectral response. A theoretical model is developed that shows that an optimum set of parameters may be defined to maximize the achievable signal-to-noise ratio. The model leads to a redefinition of the effective noise bandwidth, which takes into account the nonflat response of the directional coupler used. The model also predicts a limitation on the signal-to-noise ratio even when the stray reflectances in the interferometer are brought to zero. |
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