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Four-wave mixing (FWM) nonlinear effect is used to measure chromatic dispersion (CD) and polarization mode dispersion (PMD) spatially for different kinds of optical fiber. The back reflected signal of very high intensity pulses propagated in optical fiber is detected and one component of FWM products is used to calculate chromatic dispersion spatially. Then by controlling the state of polarization of launched light into the fiber under test, it is possible to calculate its PMD spatially.

Measuring polarization mode dispersion (PMD) in optical fibers using the nonlinear effect of four-wave mixing (FWM)