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400G first for submarine cable

Tata Communications, Huawei, and Huawei Marine have announced the successful completion of a 400G field trial on a subsea network over 6,000 km. The test results demonstrated an optical transmission of 400G signals, an industry-first for a submarine cable system of this length.  

Huawei and Huawei Marine say their technical solution 'adopted the modulation format of dual carrier polarisation division multiplexing quadrature phase shift keying (DC-PDM-QPSK), an innovative 'Faster-Than-Nyquist' (FTN) compensation and recovery algorithm, proprietary clock recovery technology and soft decision forward error correction (SD-FEC) technology to address the problems of high-speed signal distortion and unstable clocks'. The use of such advanced technology underpins Huawei and Huawei Marine’s significant commitment to investing in research and development to meet the needs of their customers, the companies say.

Hon Kit Lam, vice president for international transmission and IP business at Tata Communications, said: 'The 400G technology of Huawei & Huawei Marine demonstrates that our existing subsea network asset is capable of supporting future, next-generation transmission technology as shown in the 400G trial. Tata Communications constantly assesses new technology to expand our capabilities and to enhance our ability to support traffic growth demand from our customers.'

Jack Wang, president of Huawei Transmission Network Product Line, added: 'Huawei has always taken a customer-centric approach to our research and development efforts. Our 400G technology will not only help operators manage larger levels of traffic faster, but also optimise operating and network maintenance costs. We are pleased to be working with leading international carriers like Tata Communications on this 400G technology trial.'

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