Simultaneous Provision of UWB and Wired Services in a WDM-PON Network Using a Centralized Light Source

Simultaneous provision of multiple services using a centralized light source can greatly reduce the complexity and cost of a wavelength-division multiplexing passive optical network (WDM-PON). In this paper, we report two schemes to simultaneously provide an ultra-wideband (UWB) service and a wired service using a centralized light source. In one scheme, a UWB signal and a wired signal are multiplexed and modulated on a single wavelength in the center office for wireless and wired downstream services. In the other scheme, the wavelength from a UWB downstream signal is reused in the optical network unit to provide a wired upstream service. Both schemes are experimentally demonstrated with the data-transmission performance evaluated by measuring the electrical spectra, eye diagrams, and receiver sensitivities. The proposed schemes would greatly reduce the cost while significantly improving the spectrum efficiency of a WDM-PON network incorporating UWB-over-fiber (UWBoF) systems for broadband wireless access, making the WDM-PON network more attractive for practical deployment.