Glossary
Fiberoptic measurements

Dispersion chromatique; Chromatic Dispersion

Time spread of pulses as they propagate through an optical fiber, due to the wavelength dependence of the propagation time. Also known as the chromatic dispersion coefficient in ps.(km.nm) ^–1 .

DGD (Differential Group Delay)

Difference in propagation time between the two polarizations in a single-mode fiber. Measured in ps.km ^–1 .

DMD (Differential Mode Delay)

Difference in propagation time between the different propagation modes of a multimode fiber. Depending on specifications, this may be between extreme modes or between neighboring modes. Measured in ps.m ^–1 .

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