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cutoff wavelength

For single mode fibers, the cutoff wavelength is the shortest wavelength

at which only the fundamental mode is capable of propagation. Wavelengths below this cutoff wavelength are cut off; this wavelength is called the cutoff wavelength.

The cutoff wavelength depends on production factors, mode dispersion and numerical a perture (NA) and is 1,250 nm for 10 ┬Ám monomode fibers. Therefore, monomode fibers can only be operated with wavelengths above 1,250 nm; i.e. only in the 2nd and 3rd optical windows.

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Englisch: cutoff wavelength
Updated at: 26.01.2021
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