Doubling the bandwidth

UK-based Phyworks’ Advanced FEC algorithm has been standardised by the International Telecommunication Union (ITU) in its recently approved G.975.1 Recommendation.

UK-based fabless semiconductor company Phyworks’ Advanced FEC algorithm has been standardised by the International Telecommunication Union (ITU) in its recently approved G.975.1 Recommendation.

Set to become the global standard superseding the current recommendation G.975, the new ITU specification – including Phyworks’ algorithm – provides a standards-based platform from which operators will now be able to double the bandwidth capacity of existing terrestrial and submarine optical networks – without the massive cost penalties associated with such an advance.

“ITU Recommendation G.975.1 provides carriers and equipment vendors with the latest FEC algorithms, enabling higher network performance at the lowest cost”, according to Allard van der Horst, Product Manager at Phyworks. “Appendix I.5 describes Phyworks’ Advanced FEC algorithm and shows it to provide the highest net coding gain – setting new standards for high-performance optical networks.”

Following the recently approval of ITU Recommendation G.975.1, Phyworks has made its Advanced FEC implementation available as a silicon IP core. This enables the integration of the FEC into third-party components and the new generation of System-on-Chip devices, which will combine framers, FEC and other physical-layer functions. Using Phyworks’ Advanced FEC core, component vendors will be able to keep the same software interface and chip footprint as existing solutions.

Phyworks’ Advanced FEC has a net electrical coding gain of 9.4dB at the industry standard 6.69% overhead and is claimed to be the first commercial implementation optimised to take advantage of Soft Decision information.

The algorithm lends itself to efficient silicon implementation with low power consumption, less than 2W for a 10Gbit/sec implementation in 0.13um CMOS technology, and small chip area. Phyworks also supplies 10Gbit/sec transceiver chips which provide Soft Decision information.

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