An optical fiber transmission system includes a light emitting source, a plurality of light receiving terminals, and a plurality of optical fibers connecting the light emitting source to the light receiving terminals. The optical fiber transmission system further includes a plurality of controlling modules positioned between the light receiving terminals and the optical fibers. Each of the plurality of controlling modules includes a controller, a signal analyzer, and a reflective member. The signal analyzer and the reflective member are connected to the controller and analyze and reflect optical signals respectively.