RP Photonics logo
RP Photonics
Encyclopedia
Technical consulting services on lasers, nonlinear optics, fiber optics etc.
Profit from the knowledge and experience of a top expert!
Powerful simulation and design software.
Make computer models in order to get a comprehensive understanding of your devices!
Success comes from understanding – be it in science or in industrial development.
The famous Encyclopedia of Laser Physics and Technology – available online for free!
The ideal place for finding suppliers for many photonics products.
Advertisers: Make sure to have your products displayed here!
… combined with a great Buyer's Guide!
VLib part of the
Virtual
Library

Gain

<<<  |  >>>

Definition: a measure of the strength of optical amplification

German: Verstärkung, Verstärkungsfaktor

Categories: optical amplifiers, lasers

Formula symbol: g, G

Units: %, dB or dimensionless number

How to cite the article; suggest additional literature

In photonics, the term gain is usually used to quantify the amplification of optical amplifiers. Different meanings occur in the literature:

Apart from its magnitude, important properties of gain are its spectral bandwidth and its saturation characteristics.

The gain achieved e.g. in a fiber amplifier or the gain medium of a laser depends on the population densities in different electronic levels, which themselves depend on the optical intensities. Rate equation modeling may be used for calculating the gain and investigating its dependence on various influences.

Bibliography

[1]R. Paschotta, tutorial on "Fiber Amplifiers", part 2 on gain and pump absorption

(Suggest additional literature!)

See also: gain media, gain bandwidth, gain clamping, amplifiers, fiber amplifiers, gain saturation, gain narrowing, gain switching, gain efficiency, homogeneous saturation, inhomogeneous saturation
and other articles in the categories optical amplifiers, lasers

If you like this article, share it with your friends and colleagues, e.g. via social media:

arrow