Implementation of NLMS algorithm for chromatic dispersion compensation

The new optical communication and data transmission technologies bring possibilities for increasing transmission reliability through the digital signal processing in electric domain. High integration level of electronic and optoelectronic components in the field programmable gate array provides suitable platform for implementation of compensating algorithms and schemes. Simple and powerful universal adaptive algorithms are computationally effective for practical implementation. In this paper the normalized least mean square filter demonstrated appropriate compensation properties for step size lower than 0.5. With low number of filter coefficients and enough long training sequence it is possible to create simple structure with fast convergence. This filter type is suitable for access and metropolitan networks that utilize high-order modulation formats and have few hundred kilometers reach while their overall capacity not exceed 100 Gb.s
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