Hi,
In addition to this i want to share some information about Four Wave Mixing, as Four-wave mixing (FWM)
is a phenomenon that must be avoided in DWDM transmission, but depending on the application it is the basis of important second-generation
optical devices and optical device measurement technology.
It is one of major issues related to DWDM restricting its performance,
but in the transmission of dense wavelength-division multiplexed
(DWDM) signals, FWM is to be avoided, but for certain
applications, it provides an effective technological basis
for fiber-optic devices. FWM also provides the basic technology
for measuring the nonlinearity and chromatic dispersion
of optical fibers.
Four-wave mixing (FWM) is a type of optical Kerr effect, and occurs
when light of two or more different wavelengths is
launched into a fiber. Generally speaking FWM occurs
when light of three different wavelengths is lauched into a
fiber, giving rise to a new wave (know as an idler), the
wavelength of which does not coincide with any of the others.
FWM is a kind of optical parametric oscillation.
Thanks,