Fig. 2.

A Schematic of the SS-OCT system. Swept light source with center wavelength 1334 nm, FWHM of 117nm and a scanning speed of 20 kHz provided an average power of 18.1 mW. The first 1x2 fiber coupler with a coupling ratio 95/5 near the light source splits the light from the source respectively to sample arm (95%) and reference arm (5%). The second 2x2 fiber coupler with a coupling ratio of 50/50 was used to combine reflected lights from the sample and the reference arms and this provides equally divided interference signal to be detected by the balanced receiver. The balanced detector was used to remove the common source fluctuations and DC component from the interference signal. The signal from the balanced photo receiver was finally converted to digital signal with a A/D converter that was analyzed with a computer. Here, PC indicates a polarization controller and was used to optimize the interference signal.