ITU-T has launched the 40Gbps Passive Optical Network (NG-PON2) g.989 series of standards, and the development of the next generation of passive optical networks (Ng-pon) has taken another big step forward.
ITU-T’s first modification of ITU-T g.989.2 is an updated revision of the NG-PON2 Physical layer specification. This is a landmark development for service providers. Service providers are now watching NG-PON2 the use of more than 10Gbps of broadband access for businesses and potential home users.
Ng-pon2 is closely followed by 1G G-PON (ITU-T g.984 series) and 10G XG-PON1 (ITU-T g.987 series) with enhanced performance such as multi-wavelength operation, transceiver and receiver ONU wavelength adjustable. Based on multi-wavelength and point-to-multipoint architectures, the main solution for Ng-pon2 is time and wavelength division multiplexing PON (TWDM-PON).
In fact, the TWDM-PON is made up of four to eight wavelengths in two directions, with a maximum rate of 80Gbps in each direction. For service providers, by deploying Ng-pon2, they can reuse the fiber distribution network (ODN) used for previous generations of Pons deployments.
In addition, the wavelength of Ng-pon2 allows GPON (ITU-T g.984 series) and Xg-pon1 (ITU-T g.987 series) to coexist. For the industry as a whole, it is still in its early stages.
Some service providers are either building infrastructure to take advantage of NG-PON or conducting on-site testing with selected customers. At least three major service providers, including Verizon, Vodafone, and Energia, conducted ng-pon field tests in 2015.
Article source: People’s post and telecommunications newspaper