Tooki, O. et al. 2024. Development of a Technique for Mitigating Four-Wave Mixing Effect in Dense Wavelength Division Multiplexing System Using DP-QPSK with Channel Spacing. ELEKTRIKA- Journal of Electrical Engineering. 23, 2 (Aug. 2024), 99–108. DOI:https://doi.org/10.11113/elektrika.v23n2.456.