Fiber optics make use of total internal reflection for transmitting signals through them. Associated with fiber optics are many kinds of losses such as loss of signals due to light rays entering at angles more than the acceptance angle.
If in theory, we could make fibers that are "mirrored" on the inside which would reflect all rays of light regardless of their angle of incidence, would that improve the capacity of these fibers?
One possible reason why I think mirrored fibers should not be used is that rays entering at very high angles (approaching 90 degrees) will undergo a large number of reflections due to which they will arrive at the other end very late. This could cause interference with other data that has been sent.