Sunday, 20 May 2018

Shannon's Limit, or opportunity?

By Chris Kelly, Total Telecom
Thursday 15 February 18

Brian Lavallée Sr. director, Portfolio Solutions, Ciena, looks at the opportunities presented when we ponder Shannon's Limit

Shannon’s Limit For several years now, the submarine network industry has benefitted from the arrival of coherent-based modems allowing cable operators to upgrade their submerged network assets to previously unthinkable total information-carrying capacities. Channel speeds initially increased from 10Gb/s to 40Gb/s, then to 100Gb/s, and now even higher. Submarine cables deployed many years ago are now supporting an order of magnitude increase in total information-carrying capacity. The exact total capacity of an upgraded cable depends upon its unique performance personality, but all increases are indeed astounding. Such cable upgrades breathed new life into existing subsea wet plants, some over a decade old, and allows cable operators to maintain pace with over 40% CAGR in demand. The introduction of coherent Submarine Line Terminating Equipment (SLTE) was a sea change milestone in the industry, with operators getting used to massive increases in capacity their subsea assets could support. However, there’s a looming limit to how many bits can be crammed into an optical fiber…

Shannon’s Limit For several years now, the submarine network industry has benefitted from the arrival of coherent-based modems allowing cable operators to upgrade their submerged network assets to previously unthinkable total information-carrying capacities. Channel speeds initially increased from 10Gb/s to 40Gb/s, then to 100Gb/s, and now even higher. Submarine cables deployed many years ago are now supporting an order of magnitude increase in total information-carrying capacity. The exact total capacity of an upgraded cable depends upon its unique performance personality, but all increases are indeed astounding. Such cable upgrades breathed new life into existing subsea wet plants, some over a decade old, and allows cable operators to maintain pace with over 40% CAGR in demand. The introduction of coherent Submarine Line Terminating Equipment (SLTE) was a sea change milestone in the industry, with operators getting used to massive increases in capacity their subsea assets could support. However, there’s a looming limit to how many bits can be crammed into an optical fiber…

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