e/Optical power margin

Information
has gloss	eng: In an optical communications link, the optical power margin is the difference between the optical power that is launched by a given transmitter into the fiber, less transmission losses from all causes, and the minimum optical power that is required by the receiver for a specified level of performance. An optical power margin is typically measured using a calibrated light source and an optical power meter.
lexicalization	eng: optical power margin
instance of	c/Telecommunications terms