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19 July 2011
Huawei has joined the small but growing group of vendors shipping coherent 100Gbps transmission systems.  The customer is KPN, the incumbent operator in the Netherlands, which has installed the Chinese vendor’s 100Gbps technology on one of the busiest internet routes in the world between London and Amsterdam.
The coherent part is important because this technology provides a significant performance boost over direct detection.  Coherent detection improves the tolerance of the transmission link towards chromatic and polarisation mode dispersion, which allows 100Gbps technology to be deployed on links that were originally designed for lower speeds like 10Gbps.
Alcatel-Lucent, Ciena (which purchased Nortel Networks) and MRV Communications are the other members of the coherent club – all are shipping 100Gbps systems that comply with the Optical Internetworking Forum (OIF) framework agreement, which is based on a modulation scheme of dual-polarization, quadrature phase-shift keying (DP-QPSK).
By Pauline Rigby