APPLICATIONS & RESEARCH
Xtera completes marine installation of its second repeatered subsea cable
and technology company Telstra, have announced the successful validation of Infinera’s Advanced Coherent Toolkit for super-channels. This new technology will cover the Telstra Endeavour subsea cable stretching 9,000 km between Sydney, Australia and Oahu, Hawaii and extract the maximum capacity from subsea and long haul terrestrial cable systems carrying super- channels – whether for new large area fibres or existing cables. In trials on a range of next- generation super-channel coherent modulation technologies conducted late in 2015, two unique super-channel based capabilities were successfully X tera Communications, a provider of high-capacity, cost-effective optical transport solutions, has completed the marine installation of its second repeatered submarine cable system, deployed in the last quarter of 2015 in the Atlantic Ocean. Xtera completed testing of all the fibre pairs between the two landing sites in Q4 of 2015 on schedule. The approximately 1,500km- long cable system is built with Xtera’s Raman-based repeaters offering multiple optical transmission benefits, including wider spectrum, better noise performance, longer repeater spacing and higher tolerance to strong increases in span loss compared with repeaters based on erbium-doped fibre amplifiers.
“This new repeatered project has been deployed after the successful upgrade of the high capacity, undersea Guernsey optical-fibre subsea cable system connecting Porthcurno and Guernsey (both UK) and Lannion in France, where Xtera’s next generation wideband repeaters were inserted into the existing cable plant to increase system capacity,” said Stuart Barnes, Senior Vice President and General Manager, Xtera Submarine Business. “Our innovative repeater adds nicely to our portfolio of flexible solutions for building new subsea infrastructure, upgrading existing underwater cable assets, or recovering and re-laying existing cable assets and confirms Xtera’s position as a global turnkey supplier for the subsea cable system industry.”
Xtera’s second repeatered submarine cable system was deployed in the last quarter of 2015.
Xtera provides high-capacity optical transport solutions, supporting the high growth in global demand for bandwidth. It sells solutions to telecommunications service providers, content service providers, enterprises and government entities worldwide. Xtera’s proprietary Wise Raman optical amplification technology leads to capacity and reach performance advantages over competitive products. The company’s solutions enable cost-effective capacity to meet customers’
Xtera pioneered Raman optical amplification in long-haul optical transmission infrastructure with its Wise Raman solution that offers unrivalled optical transmission performances, unparalleled optical spectrum and operational excellence with a seamless integration of Raman amplification into optical networks. In April 2013, Xtera launched the industry’s first optical wideband repeater featuring Raman amplification for long-haul subsea cable systems. The new repeater adds to Xtera’s turnkey solutions for building new subsea cable systems or upgrading existing wet plant, including repeater replacement or re-lay of decommissioned cable systems.
bandwidth requirements to support the industry’s increasing bandwidth demand.
Infinera and Telstra validate advanced coherent toolkit on 9,000 km Endeavour Pacific cable I nfinera, a developer of intelligent transport networks, and leading global telecommunications demonstrated in the trial – Nyquist subcarriers and Soft Decision Forward Error Correction (SD-FEC) gain sharing. “The comprehensive modulation and compensation techniques in our Advanced Coherent Toolkit enable individual
service providers can leverage these advances to help their business models keep pace with downward pricing pressure. Infinera has one of the leading coherent engineering teams and I applaud them for developing these innovative optical techniques,” said Mr. Jackson. Andy Lumsden, Head of Network Services, Telstra Global Enterprise and Services said, “The flexibility of PIC-based super-channels has proven to be a major advantage in subsea operations, and the addition of next generation coherent processing provides an important capacity boost. These capabilities see us continue to exceed the demands of our customers, and provide exceptional service levels across the Telstra Global Network and North American region.”
carriers and subcarriers in the super-channel to maximise the overall reach and capacity of the customer’s fiber,” said Scott Jackson, VP of Infinera’s Subsea Business Group. “For example, leveraging these techniques allows cables that previously could only support BPSK to move to higher modulation formats in the future, or support a mix of formats across carriers and subcarriers, for increased fiber capacity and a better return on the asset. This next generation of coherent technology has the potential to dramatically extend the useful life for existing cable systems while also improving the performance of new cables.” “With trans-Pacific traffic rising at 49 percent annually,
The trial validated the benefit of Nyquist subcarriers that have been shown in other studies to offer around a 20% increase in reach compared to single carrier transmission. In addition, the trial validated SD-FEC gain sharing in which carriers with the highest performance can be paired with carriers with lower Optical Signal to Noise Ratio to improve performance. Other capabilities demonstrated as part of this trial include a new Matrix Enhanced Phase Shift Keying modulation technique that handily surpasses Binary Phase Shift Key reach performance; and the new, high-gain SD-FEC algorithm.
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