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Proceedings Paper

3x3 MZI with unbalanced differential detection for full range swept-source optical coherence tomography
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Paper Abstract

Quadrature interferometry based on 3×3 fiber couplers could be used to double the effective imaging depth in Swept- Source Optical Coherence Tomography. This is due to its ability to suppress the complex conjugate artifact naturally. We present theoretical and experimental results for a 3×3 Mach-Zehnder interferometer using a new unbalanced differential optical detection method. The new interferometer provides simultaneous access to complementary phase components of the complex interferometric signal. No calculations by trigonometric relationships are needed. We demonstrate a complex conjugate artifact suppression of 27 dB obtained in a swept-source optical coherence tomography using our unbalanced differential detection. We show that our unbalanced differential detection has increased the signal to- noise ratio by at least 4 dB compared to the commonly used balanced detection technique. This is due to better utilization of optical power.

Paper Details

Date Published: 12 August 2008
PDF: 8 pages
Proc. SPIE 7099, Photonics North 2008, 709909 (12 August 2008); doi: 10.1117/12.807440
Show Author Affiliations
Youxin Mao, National Research Council Canada (Canada)
Costel Flueraru, National Research Council Canada (Canada)
Sherif Sherif, National Research Council Canada (Canada)
Shoude Chang, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 7099:
Photonics North 2008

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