In
fiber optics
An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to ...
, mode volume is the number of bound
modes
Mode ( la, modus meaning "manner, tune, measure, due measure, rhythm, melody") may refer to:
Arts and entertainment
* '' MO''D''E (magazine)'', a defunct U.S. women's fashion magazine
* ''Mode'' magazine, a fictional fashion magazine which is ...
that an
optical fiber
An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to ...
is capable of supporting.
The mode volume ''M'' is approximately given by
and
, respectively for
step-index and
power-law index profile
For optical fibers, a power-law index profile is an index of refraction profile characterized by
: n(r) =
\begin
n_1 \sqrt & r \le \alpha\\
n_1 \sqrt & r \ge \alpha
\end
where
\Delta = ,
and n(r) is the nominal refractive index a ...
fibers, where ''g'' is the profile parameter, and ''V'' is the
normalized frequency, ''which must be greater than 5 for this approximation to be valid''.
See also
*
Equilibrium mode distribution
The equilibrium mode owerdistribution of light travelling in an optical waveguide or fiber, is the distribution of light that is no longer changing with fibre length or with input modal excitation. This phenomenon requires both mode filtering and ...
*
Mode scrambler In telecommunications, a mode scrambler mode mixer is a device for inducing mode coupling in an optical fiber, or a device that, itself, exhibits a uniform output intensity profile independent of the input mode volume or modal excitation condition. ...
*
Mandrel wrapping
In multimode fiber optics, mandrel wrapping is a technique used to preferentially attenuate high-order mode power of a propagating optical signal. Consequently, if the fibre is propagating substantial energy in affected modes, the modal distr ...
References
*
Fiber optics
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