The transit network links hubs across Australia to the network that connects homes and businesses and also links to the 121 points of interconnect — mostly located at telephone exchanges — which is where ISPs connect their own network to that of the NBN.
In a statement, the company said the high-traffic fibre links between Eastern Creek and Asquith in Sydney, and the 3600km route between Brisbane, Queensland and Darwin would be the first to be upgraded to support these speeds.
Rollout to the remainder of the network would be phased out, the company added. The Darwin to Brisbane link is scheduled to go live in December and will support capacity growth on the Sky Muster satellite network.
NBN Co will deploy the new technology at PoI sites, large fibre access nodes and highly trafficked routes as demand dictates.
Chief network deployment officer Kathrine Dyer said: “Our transit network is the backbone of the NBN Co multi-technology mix that aims to provide Australians with access to fast services.
“This upgrade will ensure we can continue to deliver a reliable and high-quality broadband network for our wholesale customers even as high-bandwidth applications and the growth of Internet usage continue to drive demand for network capacity.
“We have a clear product roadmap to continually upgrade this network with extra capacity as demand grows.
"With the upgrade to CloudWave Optics technology, we will be able to further increase total capacity on our transit network. Coriant is helping us achieve these upgrades as we scale this build and move towards our goal of connecting eight million homes and businesses by 2020."