GEFFEN4K60HZ optical fiber transmitter adopts single-fiber two-way optical fiber transmission, which can extend the transmission of HDMI high-definition signals up to 20 kilometers, and it has infrared signals, RS232 serial ports, mouse and keyboard communication interfaces. The single-fiber bidirectional LC interface is used to transmit optical fiber cables, which has low cost and more stable signal transmission. It can be used in the field of long-distance HDMI signal transmission such as security monitoring, high-definition signal between buildings, and large screen in the square.