Improvements on broadband signals in radio over fiber systems by mode filtering

In this paper, we focus on the study of large bandwidth wireless signal transmission following a 60 GHz standard over a multimode fiber link used to cover optical distribution for the last mile. To reduce the multimode effects within the fiber, a single mode fiber is first added to play a role of mode filter, and then replaced by a Mandrel as a filter. Error vector magnitude (EVM) is used as a metrics to analyze the signal degradation. Simulation results are confirmed by measurements. The EVM of the RoF links on single mode fiber, multimode fiber with and without filtering are compared.