SCM/WDM-PON with in-service baseband embedded OTDR monitoring

Subcarrier Multiplexing and Wavelength Division Multiplexing Passive Optical Network (SCM/WDM-PON) is a promising solution to support Radio over Fiber (RoF) for the convergence of optical and wireless access networks. In this paper, we propose a novel SCM/WDM-PON system with in-service baseband monitoring, which uses an optical carrier to supervise the fiber infrastructure and several subcarriers to transmit data signals simultaneously. The performance of the proposed system is investigated where an embedded baseband Optical Time Domain Reflectometry (OTDR) signal is applied for fiber fault monitoring. The results have verified the feasibility of the proposed system and shown that with proper configuration the in-service baseband monitoring signals have negligible impact on data transmission.