Relative to traditional communications media, what are the advantages of optical fiber?

The biggest advantage: cheap, traditional media are metal, how expensive ah, fiber optics is made of sand, cheap;

The second advantage: safety, no radiation, the signal will not be leaked;

The third advantage: large capacity, through the fiber optic transmission of signals, the amount of information transmitted through the different wavelengths, the capacity is virtually infinite;

Other advantages, lightweight, type of more, practical and so on. and practical, etc.