EPON uses the single-fiber wavelength division multiplexing (WDM) technology to implement single-fiber bidirectional transmission. The OLT broadcasts data downstream to all ONUs, which filter packets based on MAC addresses. In this use, a PON. passive optical network (PON), which enables efficient use of optical fibers by allowing several subscribers to share a single fiber, has been introduced. 25Gbps bandwidth, due to limitations of the physical interface, it actually provides 1Gbps bandwidth to transmit data, voice and video services.