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Radio over Fiber technology (ROF) is an essential technology for saving the remote access to broadband wireless communication. It is a combination of wireless and fiber optic networks. In this research the influence of changing the switching voltage of Mach-Zehnder modulator on millimeter wave ROF system has been presented. One of an important known data modulation as subcarrier multiplexing amplitude shift keying SCM ASK was examined. Eye diagrams were used to effectively analyze the performance of ROF optical system at different switching voltages. A larger “eye opening” signifies less noise or distortion and therefore a higher quality of the received signal. The simulation analysis shows that there are an exist acne of an optimum switching voltage (8v). The software package called "Optisystem ver. 12" has been utilized to simulate this system.
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