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Hamamatsu Corp. - Mid-Infrared LED 11/24 LB
Photonics Dictionary

four-wave mixing

A phenomenon that occurs in WDM and DWDM systems when three closely spaced signal wavelengths near the zero-dispersion wavelength interact with each other, producing a fourth wavelength that interferes with the original signal. A moderate amount of dispersion can be designed into some systems to ensure that this effect does not take place.
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