Tata Communications has conducted a 400G field trial on a subsea network over 6000 km.
The test, which was conducted in partnership with Huawei and Huawei Marine, demonstrated an optical transmission of 400G signals, an industry-first for a submarine cable system of this length.
Huawei and Huawei Marine’s 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 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," said Mr. Hon Kit Lam, Vice President, International Transmission and IP business, Tata Communications.