AL-Qadisiyah Journal of pure Science Vol.23 No. 2 Year 2018 220 Performance Analysis Of Power Optimization Over (32channels×40Gb/s) Based On Optical Network Received : 7/12/2017 Accepted : 18/1/2018 1 Essa Ibrahim Essa, 2 Mshari Aead Asker 1 Network Department, College of Computer Science and IT, Kirkuk University, Kirkuk, Iraq. 2 Computer Science Department, College of Computer Science and Math., Tikrit University, Salah AL-Deen, Iraq. Email: 1 essaibrahimessa@yahoo.com, 2 dr.msharialshmmri@yahoo.com Abstract: The input power of an optical transmitter is an important key in WDM networks; therefore these leads to a good output signal at the receiver side. In this article, the (32Channel×40Gbps) total of (1.2Tbps) of bandwidth done in a series of computer simulations, with NRZ modulation format over SSMF link with length is (50km), and power optimization are investigated, and their performances. The (BER = 6.1548× 10 −8 ), the average optical power level for all channels is (-26.6449dBm) while the average maximum Q-factors for all 32-channels are (5.2669). The best power for our simulation is (2.5118mW).The Kerr effects on WDM networks that were taken into account, also, the dispersion compensation fiber (DCF) are used to compensating the dispersion and the power loss are substituted by Erbium-doped fiber amplifier (EDFA). The simulation results show that data transmission rates are successfully transmitted with low-cost effective infrastructure with good system performance, and minimizing the probability of error for the whole network is of interest, and the system performance is well in the whole network. Our simulation designed, simulated, tested, and verified by Optisystem package is a license product Canadian company. Keywords: Optimization, WDM, BER, SSMF, DCF. Introduction: In this digital era the increasing demand for more bandwidth, appears new technologies increasing in clients we need high-speed network to deliver this requirement. An optical wavelength division multiplexing (WDM) network can contribute to, and provide unlimited bandwidth with minimum costs, for all ranges of fiber optics communication systems services such as Internet access, E-society, fiber-to-the- home (FTTH), voice over internet protocol (VoIP), video, and other multimedia interactions. The WDM plays a key role in current, and future optical network solutions due to its modular upgradability, transparency, flexibility, efficiency, reliability, and dynamic light- path allocation protection [1],[2],[3],[4]. Optical systems with data rates of 10Gbps and higher require precise dispersion compensation and careful link engineering. The WDM enables multiple- shift usage of transmission fibers by coupling several wavelengths into the fibers through appropriate optical filters. However, due to the selectivity of optical filters and limitations, in the wavelength stability of semiconductor lasers, the minimum channel spacing is  50 GHz in current commercial WDM systems. To deals with good channel spacing as the international telecommunication union (ITU) grids in industry and investigation must be lead to increase optical fiber transmission rate [5],[ 6]. The WDM innovation represents a revolution within the optical communications revolution, allowing the latter to continue its exponential growth. The existence and advance of optical fiber communications are based on the invention of the laser, particularly the semiconductor junction laser, the invention of low-loss optical