Limitation of the achievable signal-to-noise ratio in optical coherence tomography due to mismatch of the balanced receiver

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Rosa, CC (Autor) FCUP; Podoleanu, AG (Autor) Outra

Revista

Título: Applied Optics

Vol. 43

Páginas: 4802-4815

ISSN: 1559-128X

Editora: Optical Society of America

Indexação

ISI Web of Knowledge - 31 Citações

Scopus - 37 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-000-8KY

DOI: 10.1364/ao.43.004802

Abstract (EN): 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. (C) 2004 Optical Society of America.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14