Passive optical network (PON) technology is a passive broadband access technology that uplinks and downlinks data with different wavelengths, and uses time-division multiplexing technologies for data transmission. A passive optical network utilizes a point-to-multipoint (P2MP) topology, where a plurality of optical network units (ONUs) are connected to the same PON port to save central office resources. The ODN connecting the OLT and ONUs uses optical fibers and passive components to avoid electromagnetic interference and provide strong environment adaptability as well as easy expansion and upgrade. PON technology has been applied on a large scale due to its advantages of high bandwidth, high reliability, multi-service transmission, and low cost.
