To get started using your TV's optical audio port, turn off your TV and the device you want to connect with it. Here's a step-by-step guide: Fiber optic cables, also known as TOSLINK cables, use light to transmit digital audio signals. (Many of the links in this article redirect to a specific reviewed product. Your purchase of these products through affiliate links helps to. Accessing sound through a digital optical audio cable involves connecting the cable between your audio source (such as a TV, Blu-ray player, or gaming console) and your audio output device (like a soundbar, AV receiver, or external DAC). 1 home theater surround from DVD and CD players.