China Unicom has signed a deal with Nokia Siemens Networks (NSN) to upgrade its network in seven provinces. NSN will be installing a 5,000km dense wave division multiplexing (DWDM) optical network to Chongqing, Hubei, Anhui, Jiangsu, Fujian, Guangdong and Guangxi. The new system will utilise coherent polarization multiplexed quadrature phase shift keying (CP-QPSK) technology, the first to do so in China. With speeds of up to 40Gbps and the potential to upgrade to 100Gbps later, the upgrade will ‘ensure a longer life cycle for China Unicom’s network by increasing its network capacity to handle data traffic growth’ according to NSN’s head of Greater China region, Mark Borchert.
According to TeleGeography’s GlobalComms Database, at the end of March 2011 China Unicom had a 38.2% share of the broadband market, with 49.8 million subscribers.