Abstract
This paper presents a Dual-sideband Optical Carrier Suppression (DSB-OCS) technique which is used to generate an optical millimeter-wave (mm-wave) signal in radio over fiber (RoF) systems. The proposed system employs a Dual-Electrode Mach-Zehnder Modulator (DE-MZM) and a carrier of 40 GHz mm-wave for data transmission through the RoF systems. Characteristics determining the performance of the system, among which are the modulation index, phase imbalance and dispersion parameters, are included. The performance evaluations of the system show that the mm-wave signal output power follows MZM’s transfer function when the modulation index is raised. Moreover, the generated optical mm-wave signal power is affected by phase imbalance and optical splitting ratio. It is observed that the optical fiber dispersion influences the DSB-OCS system by decreasing the amplitude of the mm-wave and the signal-to-noise ratio (SNR).
Highlights
The millimeter-wave and radio over fiber (RoF) capabilities have been developed to improve the speed and the ability to meet high traffic requirements in the last few years
It is obvious that the mm-wave signal power and the phase imbalance are dependent on the insertion losses and the modulation indexes of the Effect of of both both optical opticalsplitting splittingratio ratioγγand andthe thephase phaseimbalance imbalanceφφon onthe the4m
We studied the the modulation modulation index, index, phase phase imbalance, imbalance, and and dispersion dispersion to to observe observe the the effects of these parameters on the performance of an system through the effects of these parameters on the performance of an RoF system through the Dual-sideband Optical Carrier Suppression (DSB-OCS)
Summary
The millimeter-wave (mm-wave) and radio over fiber (RoF) capabilities have been developed to improve the speed and the ability to meet high traffic requirements in the last few years. Several studies have suggested distributing the wireless signal with different techniques over the mm-wave RoF downstream systems. Optical Carrier Suppression (DSB-OCS) [14,15] All these studies generated the mmwave optically and utilized it in signal transmission. It was, noted that none of them examined the effect of modulation index on the system or the effects of optical fiber dispersion on optical mm-wave networks as well as the phase imbalance, which is crucial. Prior research on DSB-OCS has pointed towards the need to enhance the current techniques to reach higher mm-wave frequency with higher bandwidth and capability through RoF systems.
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