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Current issue   Ukr. J. Phys. 2017, Vol. 62, N 7, p.489-494


Abd H.J.1, Almahanna M.S.2

1 University of Babylon, College of Engineering, Department of Electrical Engineering
(Babylon, Iraq; e-mail: haiderlaser@yahoo.com)
2 Al-Mustaqbal University College, Department of Computer Techniques Engineering
(Baghdad, Iraq; e-mail: mehdisaleh2004@yahoo.com)

Suppression of a Nonlinear Effect for High Data Transnission Rate Systems with a Wavelength Division Multiplexer Using the Optimization of Fiber Properties

Section: Optics, Lasers, and Quantum Electronics
Original Author's Text: Ukrainian/English

Abstract: he nonlinear crosstalk has a detrimental impact on the efciency of optical communication
systems. It becomes stronger with increasing the data transmission rate and transmission dis-
tances. We have investigated and estimated the behavior of a nonlinear efect such as the four
wave mixing (FWM) under varying the fiber properties such as the frequency channel spacing,
fiber cross-section area, and dispersion. In addition, the demeanour of FWM is observed with
the use of two types of an advanced modulation format: Return-to-Zero-Frequency Shift Keying
(RZ-FSK) and Non Return-to-Zero Frequency Shift Keying (NRZ-FSK). It is found that the
FWM power obtained, when the frequency channel spacing is 80 GHz, is drastically reduced
to –77dBm in the RZ-FSK scheme, i.e., a reduction ratio in FWM is more than 21%. The
simulation also shows that the RZ-FSK modulation format under the channel spacing impact
ofers a better bit error rate (BER) than NRZ-FSK in modern optical communication systems.

Key words: nonlinear efect, four wave mixing, bit error rate, frequency modulation format.