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Telecom Business Review | Tuesday, March 28, 2023
Scientists and engineers are hard at work finding ways to boost the capacity of submarine fibre networks.
FREMONT, CA: A demand for data that seems to have no end is being driven by the world's increasing reliance on mobile and digital technology. Global internet usage increased by over 30 per cent due to the growth of streaming services, the introduction of 5G mobile networks, and the explosive growth of video calling and virtual work during the pandemic. With new services and applications gaining popularity and millions more individuals connecting to the internet every year, this trend doesn't seem to be slowing down any time soon. Over the following five years, the amount of data consumed by the world's population will more than treble, reaching over 900 exabytes per month by 2027.
Network operators are moving on with plans to expand their infrastructure's capacity in response to the surge in demand. The most obvious indication is in the access networks, where homes and businesses may now acquire dedicated fibre connections to meet their growing reliance on video platforms and cloud computing. But the subsea optical cables essential for establishing links across continents also urgently require more bandwidth. 99 per cent of the world's telecommunications traffic is currently carried by these underwater cables, which combine superfast data transfer with the security and dependability required to support such important infrastructure.
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Submarine cable constructions have rapidly increased over the past several years along all main routes following a hiatus in activity a decade ago. Companies like Google, Amazon, Microsoft, and Meta now account for almost two-thirds of all internet traffic—and an astounding 90 per cent on the busiest trans-Atlantic links—fund the majority of new deployments. Until 2028, demand for subsea links is anticipated to rise at a compound annual rate of 30 per cent to 50 per cent, with the Pacific Ocean routes predicted to experience the fastest growth.
Submarine cable systems need to be built to last because each new deployment costs hundreds of millions of dollars. This has led to rapid technological advancement, with capacity increasing from a few hundred gigabits per second (Gbps) in the 1990s to 250 terabits per second (Tbps) for the largest pipe now in use. These capacity gains have often been made possible by the continual development of transmission technology and fibre, boosting the amount of data sent across each fibre pair.
Although increasing the number of fibre pairs might seem simple, doing so necessitates a thorough rethinking of the system's design. The so-called coherent transmission technologies, which have increased the bandwidth even of pre-existing underwater infrastructure by upgrading the equipment at the ends of the cables, have largely been responsible for the capacity advances during the past few years. Coherent technologies have made it possible to broadcast and receive the full optical signal rather than just the beam intensity, especially when combined with developments in digital signal processing. As a result, more data can be encoded into the optical field, expanding the data-carrying potential of the light's polarisation. Systems that are designed to use these strategies as a result has increased capacity by ten times.
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