&(a)=<P{a>)+T(co)L.(a>-(o)+^L.(co-coy (1)

T (0)J is the group delay per unit length at angular frequency cos and j3z the second derivative of the phase per unit length characterizes group delay variations versus CO. Instead of ยก32, one uses the chromatic dispersion parameter D(XJ, expressed in ps/(nm.km), defined as the group delay variation for a length of 1 km and within a bandwidth corresponding to a wavelength variation of 1 nm around the wavelength

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