Plug Your Optical Audio Cable into Your TV Then, simply connect your optical audio cable to your TV's optical output (on the back). Be sure to line up the shape of your cable's connector with your device's input, but don't force it! Once the two line up correctly, inserting your cable should be seamless.

An optical cable transfers audio digitally, but instead of copper wire, light is used. This is a variation of fiber optics, which is used in a variety of applications. For example, if you subscribe to fiber internet, your signal is transferred via light traveling through a fiber optic cable to your home.