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What is different between the lost of coupling and efficiency overall coupling ?

I know both of them (power out/power in)e.g (5%) that means is 5% light transmission and 95% lost.

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  • $\begingroup$ Where did you read these terms? As far as I know, "lost of coupling" is not a widely used term in the fiber optics field. We could talk about coupling efficiency and coupling loss, maybe. $\endgroup$
    – The Photon
    Oct 15 '20 at 19:57
  • $\begingroup$ thanks for replaying me question.I believe, this calculation base on the measuring the power before the finer and after ? $\endgroup$
    – Sara
    Oct 16 '20 at 0:24
  • $\begingroup$ there are coupling efficiency and coupling loss, how to calculated it? $\endgroup$
    – Sara
    Oct 16 '20 at 15:46
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Coupling efficiency and coupling loss are essentially two different ways to describe the same thing.

The coupling efficiency is the portion of the incoming light in the first fiber that is coupled to the desired mode(s) in the second fiber. $$\eta = \frac{P_{\rm out}}{P_{\rm in}}$$ Coupling efficiency is usually expressed as a numerical value (as shown above) or as a percentage. It might also be expressed in decibels.

Coupling loss is just the same thing, but usually expressed in decibels as a positive number.

For example, in your example we could say the system has "coupling efficiency of 0.05", or "5% coupling efficiency" or "-13 dB coupling efficiency" or "13 dB coupling loss". Conceivably you could also say "95% coupling loss".

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