A cable assembly includes a cable and a connector, wherein the connector of the cable assembly includes laser diodes for transmitting optical signals to optical fiber wires of the cable for transferring data received from an external device and a light-emitting diode (LED) for emitting a visible light to a plastic fiber wire of the cable so that a user can use the visible light for different purposes. In addition, the connector of the cable assembly is capable of conforming to a standard HDMI connector or integrated with an earphone.