Abstract: A 4-channel parallel optical module used for long distance transmission for high-definition multimedia interface (HDMI) signal is implemented and tested. An 850nm vertical cavity surface emitting laser (VCSEL) array is used as the light source of the transmitter, and a photodiode (PD) array is adopted as the detectors of the receiver. Connected by a multimode fiber array with maximum length of 300m, bit rate of each channel is up to 3.4Gbps. While highspeed signal can not reach far with traditional copper lines, HDMI fiber is a good solution to meet the needs for long-distance transmission of high definition video signals.