light was transmitted through a fiber optic cable and left the cable the instant it entered. after exiting the light wave enters and travels 50% of cable while simultaneously an opposing "reverse" light traverses the cable to 50% as they diminish into nothing at half the length of the optic...
looking for information about phenomena when light through fiber out before through and photon reverses at exit time to negate entering photon leading to equilibrium of energy transfer. think it was coated with iridium or something. not sure. saw it reported on shortnews.com about a year or so...