primarily focus on the technical transmission characteristics of the existing cable system. Older systems for example can be a challenge to upgrade with additional capacity, as fibre loss, dispersion and nonlinear penalty can give rise to capacity limitations. If these parameters can be overcome with new transmission equipment technology, within the landing station, then a simple optical tap into the existing marine cable can pave the way for new capacity upgrades. Within the station equipment, advancements in modulation techniques and improved Forward Error Correction (FEC) are two examples, which new technology has enabled impairments to be overcome. This is a significant development enabling the system to correct bit errors, due to impairments, such as dispersion thus expanding capacity.
Capability With an ever-increasing desire to push more light over greater distances to increase system capacity, Huawei Marine has successfully and steadily delivered numerous upgrades using its stateof-the-art submarine line transmission equipment.
It is about being creative and innovative. With the right organisational mindset and customer centric culture, anything can be achieved! The process of upgrades builds capability and gains track-record. It is only through partnership and long-term commitment, can the formation of sustainable relationships be created.
FIG3: BDSNi network in Bahamas
Upgrade cases Case example1: Introduction of the Bahamas Domestic Submarine Network international (BDSNi) in the Caribbean region. This system connects more than 20 sites between Bahamas and Haiti and stretches across 3,500 kilometers with the longest section of 343 km. Huawei Marine has successfully implemented upgrades, utilizing Raman technology. The network provides high speed internet services for the Bahamas and Haiti via a spur connection. Segment 1 linked Duncan Town to Matthew Town, representing some 300km and segment 2 from Matthew Town to PortAu-Prince, a system length of 350km. Such system lengths are quite typical of these regional inter-island systems that fit well in the upgrade space. The process to implement any upgrade is governed by understanding the system baseline, such as the installed fibre base.