Browsing by Author "Alshaykha, Ali Mustafa Ali"

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Flexible platform for ROF network using advanced modulation formats based on MMF
(Çankaya Üniversitesi, 2017) Alshaykha, Ali Mustafa Ali
The connected devices in the networks are increased and the data flow between each of them is increased too. The wireless connectivity is preferable, but it has a short range and needs to enlarge the signal coverage. New wireless technologies and new access networks based on Fiber can be real solutions and it can be used with modulation techniques to achieve multi-gigabit wireless links. RF signal can be transported over optical fiber from a central location to remote antenna units by using radio over fiber (ROF). In this thesis, two test beds are demonstrated as a software simulation for the ROF, based on hybrid optical fiber and WDM. Multiple users have been also taken into consideration with the cost-effectively and bandwidth. Some passive or active components have been used with fiber length 50km. In the simulations, the ROF architecture has been simulated in C-band wavelength which has ranged between 1530 nm and 1565 nm. Then, to overcome nonlinearities problem, EDFAs are used to compensate the loss in signal. As a result of the first experiment, the average of total power for the three output signal is determined as 13.333dBm with 2.5Gbps bitrate. As a result of the second analysis with 1Gbps bitrate, the average Q-factor for two output signals is 6.0846, and the average of minimum BER is 3.7738E-10. Meanwhile, there is limitation of degradation in the signal along the whole networks by using optical and electrical amplifiers; the simulation results show that the networks are fully exploited, with low error rate.