This article first reviews the different ITU-T standards of PON.And then it focuses on an introduction of the latest XGS-PON standard,compatibility design with current PON approach and migration solution.Finally it summarizes the next evolution of overall 10G PON and high lights XGS-PON opportunity today%首先回顾了PON标准的各个方案和规范,然后着重介绍了XGS-PON标准以及XGS-PON与现有PON技术的兼容性设计和升级共存方案,最后对XGS-PON的发展进行了展望.
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