An optical signal transferring apparatus, an electronic apparatus, and a source device, and methods of operating the same include a signal transfer unit including one or more signal lines transferring a signal between a first apparatus and a second apparatus and one or more power lines transferring power between the first apparatus and the second apparatus; and a first connector connected to the first apparatus, and a second connector connected to the second apparatus, wherein the signal transfer unit is configured to transfer an optical signal to the second apparatus in response to a power-on input of the first apparatus and transfer, to the first apparatus, power and data which are received from the second apparatus in response to detection of the transferred optical signal, respectively, via the one or more power lines and the one or more signal lines.