India's Tata Communications, Huawei and Huawei Marine have completed the first successful field trial of 400G transmission over a more than 6000km subsea cable system.
The companies revealed they used dual carrier polarisation division multiplexing quadrature phase shift keying (DC-PDM-QPSK) and proprietary clock recovery and error correction technology to overcome the problems of high-speed signal distortion and unstable clocks.
Tata Communications vice president for international transmission and IP business said the trial “demonstrates that our existing subsea network asset is capable of supporting future, next-generation transmission technology.”
Huawei president of transmission network products Jack Wang added that 400G technology has the potential to allow operators to manage escalating traffic demands, while also reducing operating and network maintenance costs.
Huawei isn't the only vendor setting the stage for 400G upgrades. Alcatel-Lucent, for example, has been trialling 400G transmission over terrestrial optical networks since early last year.