Abstract:

The traditional TDM PON technology, which focuses on “bandwidth enhancement,” can no longer meet the needs of some low latency applications, and there is an urgent need to conduct research on low latency technologies for PON networks. Firstly elaborates on the low latency requirements of cloud VR/AR, industrial applications, and other scenarios, and then analyzes the composition of PON network latency. The latency problem mainly comes from the uplink bandwidth allocation mechanism and the uplink random latency introduced by the ONU registration/ranging mechanism. Key low latency technologies such as fixed bandwidth allocation, single frame multi burst, and collaborative DBA were introduced for the former. Introduced low latency key technologies such as out of band window opening and small window opening for the latter.

Key words: passive optical network, low latency, single frame multi burst, collaborative DBA, out of band windowing