Characterization of Four Wave Mixing Effect in Dense Wavelength Division Multiplexing Systems

This study presents the characterization of four wave mixing (FWM) effect in dense wavelength division multiplexing (DWDM) systems with two different types of optical fibers which are standard single mode fiber (S-SMF, G.652.D) and nonzero dispersion shifted fiber (NZDSF, G.655.C), respectively. The experimental observation of FWM effect at the received signal spectrum have shown that the increase in channel spacing reduces the power of FWM tone signals. Also, we have compared FWM penalty of DWDM signals transmitted in S-SMF and NZDSF by calculating FWM efficiency affected by the channel spacing. It was shown that when the channel spacing is smaller than 0.5 nm, the FWM efficiency in NZDSF is almost 15 dB higher than the FWM efficiency obtained in S-SMF. Moreover, the results have shown that for 10, 20, 30 km of NZDSF, the FWM efficiency tends to increase with optical fiber length.