Submarine Optical Communications System Providing Global Communications Network

摘要

The capacity of the global communications network is being progressively increasedto handle the rapid growth in telecommunication traffic generated by the Internet.Fujitsu supplies submarine optical cable systems that can provide the huge capacityand short transmission delay required by carriers. There are two ways to increasecapacity: construct a new submarine cable system or upgrade the existing one.For the latter, in particular, coupler insertion technology has been established.This allows the existing submarine line terminal equipment (SLTE) and new SLTEto co-exist in one system. As the existing submarine portion will continue to beused unchanged, this technology can reduce the amount of work done at sea andcontribute to cost and lead-time reductions. Fujitsu has chosen to use return-to-zerodifferential phase shift keying (RZ-DPSK) technology to improve the upgradeablecapacity and has applied it to several transpacific projects.