The present invention provides an optical to electrical converter, which comprises an optical transmission unit, an electrical transmission unit and a rotating mechanism. The optical transmission unit is connected to the electrical transmission unit via the rotating unit, and the optical transmission unit and the electrical transmission unit can be rotated relative to each other by the rotating mechanism. Further, the electrical transmission unit is able to connect to a system end, such as a computer, and perform electrical signal transmission with the system end (computer), thereby enabling the system end (computer) having an optical transmission function via the optical to electrical converter.