FEATURE EMERGING TRENDS AND APPLICATIONS OF UNREPEATERED SYSTEMS IN REGIONAL SUBSEA NETWORKS BY TONY FRISCH, ANDERS LJUNG AND LYNSEY THOMAS
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n the rapidly evolving world of global communications, the spotlight often shines on high capacity, repeatered transoceanic submarine cables linking continents on strategic routes. These massive projects, typically backed by tech giants (and to a lesser extent, international consortia) understandably attract attention due to their sheer scale, capacity and price. However, in the shadows of these goliaths lies an equally critical but often underappreciated element of the global connectivity puzzle: unrepeatered submarine cable systems. These cables are used to provide regional and inter-island links, cross rivers and bays, and deliver vital connectivity to offshore installations like oil rigs and wind farms. Unrepeatered systems, so named because they operate without powered signal amplification along their length, may lack the glamour of their repeatered counter-
60 SUBMARINE TELECOMS FORUM MAGAZINE
Unrepeatered systems, so named because they operate without powered signal amplification along their length, may lack the glamour of their repeatered counterparts, but their simplicity, flexibility, and costeffectiveness make them indispensable to the digital infrastructure of many regions.
parts, but their simplicity, flexibility, and cost-effectiveness make them indispensable to the digital infrastructure of many regions. This article explores the technical, commercial, and economic value of unrepeatered systems, drawing on our extensive experience in offshore connectivity.
A HISTORICAL AND TECHNICAL CONTEXT
Unrepeatered submarine cable systems represent the oldest and most straightforward architecture in subsea communications. Historically, these were the first true “Open Systems” due to their passive nature. Unlike repeatered systems that rely on powered amplifiers, repeaters, spaced along the cable, unrepeatered cables transmit optical signals directly from one end to the other, often up to several hundred kilometres, without intermediate amplification (except in the case of