A common-path Fourier-domain OCT for endoscopic imaging, which uses the distal-end surface of the fiber as a selfaligned
reference mirror, is reported. A miniaturized probe is designed for this OCT system. A reference Michelson
interferometer is used to compensate for the optical path difference and mismatch of dispersion and polarization states
due to the miniaturized probe. This configuration allows arbitrary probe fiber length and provides sufficient working
space for imaging optics and their package, and thus is suitable for OCT imaging of lumens of various sizes.
Additionally, the reference intensity is able to be tuned by index match oil to optimize the signal to noise ratio of the
system. Due to this common-path configuration, the OCT signal is immune to the bending or handling of the fiber
connecting with the probe.
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