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Chromatic Dispersion Measurement: The EXFO Phase-Shift Method

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Chromatic Dispersion Measurement: The EXFO Phase-Shift Method

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  • Author: François Babin, Francis Audet
It is usually necessary to measure relative propagation delays as a function of wavelength in order to determine the chromatic dispersion (CD) curve of an optical fiber. For instance, if short optical pulses are generated simultaneously at a number of wavelengths, then launched into a long fiber, CD will cause the pulses at different wavelengths to propagate through the fiber at different speeds-leading to relative delays in arrival times. This is the basic principle underlying most CD measurement instruments used for characterizing fiber spools or telecom fiber links.

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