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  • Title: 3x3 Mach-Zehnder interferometer with unbalanced differential detection for full-range swept-source optical coherence tomography.
    Author: Mao Y, Sherif S, Flueraru C, Chang S.
    Journal: Appl Opt; 2008 Apr 20; 47(12):2004-10. PubMed ID: 18425172.
    Abstract:
    Quadrature interferometry based on 3x3 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 3x3 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 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.
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