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. Author manuscript; available in PMC: 2009 Sep 29.
Published in final edited form as: Curr Opin Biotechnol. 2009 Mar 4;20(1):111–118. doi: 10.1016/j.copbio.2009.02.007

Figure 1.

Figure 1

Schematic layout of typical polarization-diverse Fourier-domain optical coherence tomography systems. (a) Spectral-domain systems rely on a broadband lightsource and a spectrometer as a detector. (b) In frequency-domain systems, the light source is a wavelength-swept laser and the receiver comprises single-element photodiodes. A frequency-shifter is typically used to resolve otherwise degenerate positive and negative depths relative to the reference arm pathlength. PBS: polarization beam splitter; BBS: broadband beam splitter.