Three beam D-OCT system. C: Miniature Fiber Collimator, FC: Fiber Collimator, L: Lens, G: Grating, BS: Beamsplitter, M: Mirror, PP: Dispersion-compensating Prism Pairs, NF: Neutral Density Filter, FPT: Facet Prism Telescope, T: Telescope, MEMS: two-axis gimbal-less scanning mirror, LS: Linear Stage, SLD: Superluminescent Light Emitting Diode, CAM: Line Scan Camera.