| Next-Generation Passive Optical Network 2 | |
| Status | In force |
|---|---|
| Year started | 2015 |
| Latest version | 1.0 March 2020 |
| Organization | ITU-T |
| Committee | ITU-T Study Group 15 |
| Base standards | G.983, G.984 |
| Related standards | Higher Speed PON |
| Domain | Telecommunication |
| License | Freely available |
| Website | https://www.itu.int/rec/T-REC-G.989 |
NG-PON2 (also known as TWDM-PON), Next-Generation Passive Optical Network 2 is a 2015 telecommunications network standard for a passive optical network (PON). The standard was developed by ITU and details an architecture capable of total network throughput of 40 Gbit/s, corresponding to up to 10 Gbit/s symmetric upstream/downstream speeds available at each subscriber.[1][2]
A passive optical network is a last mile, fibre-to-the-x telecommunications network that broadcasts data through fibre optic cables. PONs are managed by passive optics such as unpowered splitters and filters, offering high reliability and low cost compared to active networks. The PON data stream is generally converted to a more traditional service such as Ethernet and Wi-Fi at the subscriber's location.
NG-PON2 is compatible with existing PON fibre by replacing optical line terminal (OLT) at the central office, and the optical network unit (ONU) near each end-user.
Unique to this standard is the use of both active filters and tunable lasers in the ONU.
From 2019 until 2021 a series of new Recommendations under the header Higher Speed PON (G.9804 series) was released intended as successors to NG-PON2.