The present paper investigates performance of next generation passive optical network (NG-PON) with effective chromatic dispersion (CD) compensation method in physical layer. We report on 16-channel spectrum sliced wavelength division multiplexed passive optical network (SS-WDM PON) with shared amplified spontaneous emission (ASE) light source as NG-PON solution, which is based on ITU T G.694.1 DWDM frequency grid, and is capable to provide data transmission over 20 km fiber span with transmission speed at least 2.5 Gbit/s per channel. It is shown, that performance of this optical access system can be improved by using chromatic dispersion compensation module with fiber Bragg grating, in such a way providing data transmission over 20 km SMF fiber span with BER<1e-10.