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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 4, p.326-334


Abed Haider Jabber1,2, Din N.M.2, Al-Mansoori M.H.3, Abdullah F.2, Fadhil Hilal A.4

1 Department of Electrical Engineering, College of Engineering, University of Babylon
(Babel-City, Iraq; e-mail: haiderlaser@yahoo.com)
2 Centre for Communications Service Convergence Technologies,
College of Engineering, Universiti Tenaga National
(Jalan IKRAM-Uniten, 43000 Kajang, Malaysia)
3 Faculty of Engineering, Sohar University
(PO Box 44, PCI 311, Sohar, Oman)
4 School of Computer Engineering, Universiti Malaysia Perlis

Comparison Among Different Types of Advanced Modulation Formats Under Four Wave Mixing Effects

Section: Optics, lasers, and quantum electronics
Original Author's Text: English

Abstract: Advanced modulation formats play a significant role for enhancing the bit rate in an optical transmission system. Ultra-long haul transmission distances are intensively investigated to further increase the spectral efficiency for building the next-generation optical networks. However, under a high data rate, the effects of a fiber nonlinearity such as the four-wave mixing (FWM) give a significant lower system performance. In this paper, a system simulation is performed to compare the robustness of four types of modulation formats such as Return-to-Zero Frequency Shift Keying (RZ-FSK), Non- Return-to-Zero Frequency Shift Keying (NRZ-FSK), Differential Phase Shift Keying (DPSK), and Duobinary (DB) to the FWM effect, where the performances were mainly characterized by eye opening penalties and Bit Error Rate (BER). It was found that the FWM power is the lowest with the DPSK modulation format and reaches –55 dBm, while, in the presence of RZ-FSK modulation, it reaches a maximum value and is equal to –14 dBm. In addition, the the DPSK gives a low value of BER of 4.56×10-68 in comparison with RZ-FSK modulation that offers BER in the range of 2.83×10-14 . It can be concluded that the DPSK modulation can be a crucial component to suppress the FWM effect in a wavelength division multiplexing system.

Key words: four-wave mixing, modulation format, nonlinear effect, DPSK, RZ-FSK.