Four-wave mix

Four-wave mixing ( English four-wave mixing , FWM ) is a intermodular distortion in optical systems. As an examination method, it is used in optical spectroscopy , e.g. B. in the production of laser-induced gratings .

When three wavelengths (λ ₁ , λ ₂ , and λ ₃ ) interact in a nonlinear medium , they increase the amplitude of a fourth wavelength (λ ₄ ). If two wavelengths are the same, one speaks of degenerate four-wave mixing ( DFWM = degenerate four-wave mixing ).

Four-wave mixing is a fiber optic characteristic that affects wavelength division multiplexing , in which optical wavelengths are transmitted on equidistant wavelengths. The FWM interference produces an effect that is comparable to crosstalk .

Individual evidence

↑ R. Paschotta: four-wave mixing. In: Encyclopedia of Laser Physics and Technology. Retrieved July 1, 2015 .
↑ Four-wave mixing in the NLO lecture, chap. 6, Clausthal, 2006, as PDF , accessed on February 27, 2010.
^ Volkmar Brückner: Elements of optical networks . Basics and practice of optical data transmission, 2nd edition. Vieweg + Teubner, 2011, ISBN 3-8348-1034-7 , pp. 163-166.

Web links

Four-Wave Mixing and Applications (accessed March 29, 2018)
Nonlinear Optics p. 67 ff. (Accessed on March 29, 2018)

[1] R. Paschotta: four-wave mixing. In: Encyclopedia of Laser Physics and Technology. Retrieved July 1, 2015 .

[2] Four-wave mixing in the NLO lecture, chap. 6, Clausthal, 2006, as PDF , accessed on February 27, 2010.

[3] Volkmar Brückner: Elements of optical networks . Basics and practice of optical data transmission, 2nd edition. Vieweg + Teubner, 2011, ISBN 3-8348-1034-7 , pp. 163-166.