In telecommunications, return loss is the loss of signal power resulting from the reflection caused at a discontinuity in a transmission line or optical fiber. This discontinuity can be a mismatch with the terminating load or with a device inserted in the line. It is usually expressed as a ratio in decibels (dB);
- where RL(dB) is the return loss in dB, Pi is the incident power and Pr is the reflected power.
Return loss is related to both standing wave ratio (SWR) and reflection coefficient (Γ). Increasing return loss corresponds to lower SWR. Return loss is a measure of how well devices or lines are matched. A match is good if the return loss is high. A high return loss is desirable and results in a lower insertion loss.
Return loss is used in modern practice in preference to SWR because it has better resolution for small values of reflected wave.
Read more about Return Loss: Sign, Electrical, Optical
Famous quotes containing the words return and/or loss:
“Or ever the silver cord be loosed, or the golden bowl be broken, or
the pitcher be broken at the fountain, or the wheel broken at the
cistern.
Then shall the dust return to the earth as it was: and the spirit
shall return unto God who gave it.
Vanity of vanities, saith the preacher, all is vanity.”
—Bible: Hebrew Ecclesiastes (l. XII, 6–7)
“Quarrel not at all. No man resolved to make the most of himself, can spare time for personal contention. Still less can he afford to take all the consequences, including the vitiating of his temper, and the loss of self-control. Yield larger things to which you can show no more than equal right; and yield lesser ones, though clearly your own. Better give your path to a dog, than be bitten by him in contesting for the right. Even killing the dog would not cure the bite.”
—Abraham Lincoln (1809–1865)