Telecommunication

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Comparative study of different modulation schemes in optical fiber communication system
(Université M’Hamed BOUGARA de Boumerdes : Institut de génie electrique et electronique (IGEE), 2018) Bella, Douniazed; Tamalt, Meriem; Zitouni, Abdelkader(Supervisor)
In this project, we investigate and comprehensively compare Non-return-to-zero (NRZ) with the advanced modulation schemes: carrier- suppressed return-to-zero (CSRZ) and Duo-Binary (DB) modulations using three approaches to compensate the dispersion: pre-compensation, post-compensation, and symmetric compensation at operating wavelength 1550 nm and 90km fiber length through computer simulations. The influence of the LASER input power has been studied at three bit rates: 5 Gbps, 25 Gbps, and 40 Gbps.The performance characteristics like bit error rate, Q-factor, and eye diagram are compared and discussed by simulating different cases using tables and graphs in order to compare the different results.