Design and Performance Optimization of WDM Lightwave System Using Optimum Modulation Formats
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SHORT COMMUNICATION
Design and Performance Optimization of WDM Lightwave System Using Optimum Modulation Formats Jalil Aziz Hamadamin1
•
Muhammed Abdulbaqi Ibrahim1 • Salih Mustafa Saleem2
Received: 31 August 2017 / Revised: 25 January 2020 / Accepted: 31 January 2020 Ó The National Academy of Sciences, India 2020
Abstract In this paper, a 16-channel 40 Gb/s wave division multiplexing lightwave system is simulated using OptiSystem version 14 and optimized. This paper proposes a Pareto optimization and particle swarm optimization algorithms to find optimum launch power for minimum bit error rate (BER). However, simulation results show that the proposed algorithms proved to be a good solution and take considerable computational time to converge and reach global optimum. It is concluded that return-to-zero modulation format has higher-quality factor, lower BER, and lower distortion and it is less affected by the fiber nonlinearity. Keywords BER OSNR PSO Pareto Q-factor
Introduction Optical fibers are becoming the leading transmission media in long-distance transmission. Moreover, information is transferred in the form of light through optical fiber, which emerged as dominant technology nowadays because of the
& Jalil Aziz Hamadamin [email protected] Muhammed Abdulbaqi Ibrahim [email protected] Salih Mustafa Saleem [email protected] 1
Department of Electrical Engineering, College of Engineering, Salahaddin University-Erbil, Erbil, Kurdistan Region, Iraq
2
Department of Electrical Engineering, University of Duhok, Duhok, Kurdistan Region, Iraq
provision of wide bandwidth, high data rates, immunity to interference, electrical isolation, signal security, less size, weight, etc. [1]. The optimum design of an optical communication system often involves the optimization of several parameters, which has been simulated, where a grid search is performed over all possible combination of parameters in order to find the best solution. For several data rates and system parameters, a considerable amount of computational time is required to solve numerically the signal propagation in the fiber. With higher launched power to the lightwave systems, the effects of nonlinearity in optical fibers occur and the refractive index of the medium changes with optical intensity [2]. To reduce nonlinearity effects, the launched optical power is to be optimized. Luis et al. proposed a multidimensional and global optimization of the optical spectral shaping based on genetic algorithm (GA) for fiber nonlinearities mitigation in high-baud-rate transmission systems using programmable optical filter (POF) [3]. Hao et al. proposed a Pareto-based multiobjective optimization technology and GA to design a wave division multiplexing (WDM) fiber Bragg grating (FBG) sensor network [4]. Leonardo et al. presented a global optimization algorithm for the optimization of optical communication systems [5]. This paper proposes a Pareto optimization and particle swarm optimization (PSO) algorithms to find optimum fiber launch power for
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