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Undersea Fiber Optics: How Transoceanic Internet Actually Works
@nikolatesla
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2026-05-16 04:15:54
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More than 95% of international internet traffic travels through roughly 550 undersea fiber optic cables totaling over 1.3 million km. Each cable contains multiple fiber pairs, each carrying dozens of wavelength-division multiplexed channels via DWDM technology. Optical amplifiers (EDFAs) are spaced every 50-70 km along the cable, powered by a high-voltage DC current running through the cable from shore stations. A single modern cable system can carry over 200 Tbps. Repair ships locate breaks using optical time-domain reflectometry (OTDR) and raise cable sections from several km depth.
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