Infinera and Australian incumbent Telstra, serving around 16.7 million mobile, 7.3 million fixed voice and 3.1 million retail fixed broadband subscribers, announced they have successfully validated Infinera's Advanced Coherent Toolkit (ACT) technology for super-channels.
The new Infinera technology will be implemented over the Telstra Endeavour subsea cable that spans 9,000 km between Sydney, Australia and Oahu, Hawaii, with the objective of realising the maximum capacity from both subsea and long-haul terrestrial cable systems carrying super-channels, whether for new large area fibres or existing cables.
In trials conducted by Infinera and Telstra on a range of next-generation super-channel coherent modulation technologies in late 2015, two advanced super-channel based capabilities were demonstrated, specifically, Nyquist sub-carriers and soft decision forward error correction (SD-FEC) gain sharing.
The trial served to validate the advantages enabled with Nyquist sub-carriers, which have been shown in previous studies to deliver around a 20% increase in reach compared to single carrier transmission. The trial also validated SD-FEC gain sharing via which carriers with the highest performance can be paired with those with lower optical signal to noise ratio (OSNR) to improve transmission performance.
Additional capabilities demonstrated during the trial included a new matrix enhanced phase shift keying (ME-PSK) modulation technique designed to surpass the reach performance provided by binary phase shift key (BPSK) and a new high-gain SD-FEC algorithm.
In early 2015, Infinera announced that Pacnet, which was acquired by Telstra for nearly $700 million in April last year, has deployed its Open Transport Switch (OTS) software to extend network virtualisation into the optical layer. For the project, Pacnet deployed Infinera's OTS in its SDN platform, Pacnet Enabled Network (PEN), across its 100 Gbit/s-enabled, Infinera DTN-X-based trans-Pacific and regional intra-Asia submarine network.
Leveraging Infinera's OTS software, combined with the DTN-X platform, enabled the PEN to deliver Layer 1 transport bandwidth on-demand in increments of N x 10 Gbit/s, and potentially in increments of N x 100 Gbit/s for high-capacity customers.
Regarding the trial, Scott Jackson, VP of Infinera's Subsea business group, said, "The modulation and compensation techniques in Infinera's ACT enable individual carriers and sub-carriers in the super-channel to maximise the overall reach and capacity of customer's fibre… for example, these techniques allow cables previously only able to support BPSK to move to higher modulation formats… or support a mix of formats across carriers and sub-carriers for increased fibre capacity".