25G passive optical network (PON) deployments are likely to begin in 2022 based on interviews with operators across the world. The basic catalyst for higher-speed PON is bandwidth demand, with momentum for 25G PON increasing as operators reuse their FTTP networks for higher-revenue customers and applications. These customers and applications include high-end gamers, enterprises, and 5G small cell transport, known as xHaul. PON has proven its success as the widely deployed fiber access infrastructure, supporting more than 680 million homes today. The PON ecosystem has a well-developed upgrade path, with 10G PON in deployment now, over the same optical distribution network (ODN) as earlier generations of PON technologies. 25G PON provides operators with an upgrade path to higher-bandwidth services, along with support for network slicing.