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In order to achieve long haul transmission distance in DWDM systems, polarization mode dispersion (PMD) and non-linear impairments affecting system performance have to be minimized. This paper proposed polarization interleaving strategy for 40 Gbps DWDM systems to remove PMD, 3rd order nonlinearity between neighboring channels by adjusting a state of polarization using linear polarizers so that adjacent channels are orthogonal to each other. The proposed system had the acceptable value of Q factor at all fiber lengths i.e. Q factor of polarization interleaved system was 16 and conventional DWDM system was 3.2 at 720 km fiber length. It was observed that signal quality increases with polarization interleaving, which leads to increase in transmission distance. Then a comparison of three different electrical filters i.e. Gaussian, rectangular and Bessel filter at receiver was performed for different optical fiber lengths which show that Bessel filter had improved performance with polarization interleaving. Also better eye opening was observed for different fiber lengths with proposed technique. At particular instance Q factor for Bessel, Gaussian and rectangular filters were 12, 9.9 and 8 for 864 km fiber length.
Polarization interleaving, DWDM, Q factor, Polarization mode dispersion, Long haul transmission.
GEETIKA, R. S. KALER, GURPREET KAUR, Mitigation of PMD over DWDM system using polarization interleaving, Optoelectronics and Advanced Materials - Rapid Communications, 15, 1-2, January-February 2021, pp.49-54 (2021).
Submitted at: Jan. 9, 2020
Accepted at: Feb. 12, 2021