If the back of your entertainment system looks like a cross between mission control and a 1960s Manhattan switchboard, you could probably use a little help separating your composite from your component video. In this article, I’ll explain the oxymoronic mystery that is optical audio, with stops along the way to explore the evolution of inputs, outputs, standards and jacks that led to it. I’ll also tell you how this fiberoptic system stacks up against HDMI.