Figure 1 depicts an experimental setup of SD PS-OCT, which includes a fiber-based, Michesion type spectral-domain interferometer. A broadband, 1,300-nm superluminescent diode (56-nm FWHM) was coupled into the interferometer via an optical coupler. The spectrometer consisted of a 50-mm focal length collimator, a transmitting grating, an achromatic lens with a 150-mm focal length, and a 14-bit, 512-pixel InGaAs line-scan camera with a maximum acquisition rate of 20 kHz. This spectrometer setup had a spectral resolution of 0.155 nm, which gave a maximum imaging depth of (in air).The measured axial imaging resolution of the system was in air, and with a 50-mm-focal-length objective lens in the sample arm, the lateral resolution was . The phase sensitivity of the system was estimated to be around 7.5 mrad, corresponding to a displacement sensitivity of 785 pm.