  We introduce a system capable of focusing light through a multimode fiber in
37ms, one order of magnitude faster than demonstrated in previous reports. As a
result, the focus spot can be maintained during significant bending of the
fiber, opening numerous opportunities for endoscopic imaging and energy
delivery applications. We measure the transmission matrix of the fiber by
projecting binary-amplitude computer generated holograms using a digital
micromirror device and a field programmable gate array controller. The system
shows two orders of magnitude enhancements of the focus spot relative to the
background.
