Fiber-Optic Cables Carry 99% of Global Internet Traffic at Up to 352 Terabits a Second
Updated
Updated · maketecheasier.com · Aug 9
Fiber-Optic Cables Carry 99% of Global Internet Traffic at Up to 352 Terabits a Second
1 articles · Updated · maketecheasier.com · Aug 9
Summary
Subsea fiber-optic cables handle about 99% of intercontinental internet traffic, while satellites account for just 0.37% of U.S. international capacity, underscoring why the global network still depends on seabed links.
160 terabits per second on MAREA and 352 terabits on Google’s Grace Hopper come from stacking dozens of laser wavelengths on each fiber pair, encoding light by phase, brightness and polarization, then boosting signals every 60 to 100 kilometers.
600-plus active and planned systems now span more than 1.5 million kilometers of seabed, with the glass cores protected inside cables only 17 to 20 millimeters thick in deep water and heavily armored near shore.
Roughly 200 cable faults occur worldwide each year, with about two-thirds caused by fishing gear and dragged anchors; repairs often take weeks, and countries with only one landing can suffer severe outages.
Low-Earth-orbit satellites can cut latency for remote users, but their capacity remains far below fiber, leaving hair-thin glass strands on the ocean floor as the backbone of the global internet.