levi
Still fresh, damnit!
Yes, although that's referring more to the coating, which as an opaque plastic is open to being heavily attacked by UV, because it's an ionising form of energy. I've never seen UV damage to silica glasses such as house windows, which I suspect you'd need to use for a wide frequency cable designed to transmit sunlight, although specific cables for specific uses can be made out of flouride glasses and more esoteric stuff.