Fault Monitoring in Passive Optical Networks Using Burst-Mode FBG Optical Sensor

This paper presents a fault monitoring method in passive optical networks (PON) using Burst-mode uniform FBG optical sensors. The proposed monitoring method detects physical layer faults between optical line terminal (OLT) and optical network units (ONUs). The FBG interrogation subsystem located in central office (CO) near OLT transmits FBG monitoring signal to every ONU. Each ONU branch contains an FBG sensor subsystem. The proposed system provides Burst mode upstream data transmission using time division multiple access (TDMA). We show that the proposed system is a cost-effective solution that has ability to monitor faults of any ONU branches in PON.