energy that has not been transmitted or absorbed.
The full or partial return of transmitted optical or electromagnetic energy to the source by an index or impedance mismatch, measured in decibel (dB).
A measure of the amount of reflected energy from a single event (e.g. a mechanical splice, a connector mating, etc.)on a fiber cable. Measured in -dB and pertains only to the specific event. A contributing factor to ORL.