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Optical cables are laid in an S-shape to provide slack, allowing them to flex and absorb stress without breaking.
Purpose of the S-Shape
Undersea fiber optic cables are not laid straight on the ocean floor; instead, they are deployed in gentle S-shaped curves. This design is crucial because it prevents the cable from being stretched or snapped by environmental forces such as underwater currents, earthquakes, landslides, or accidental contact with ship anchors and fishing equipment (Conflingo) . The S-shape introduces slack, which allows the cable to move slightly and conform to the seabed without experiencing excessive tension.
Installation Process
Cable-laying ships carefully deploy the cable along pre-surveyed routes. The cable is released slightly slower than the ship's speed, naturally forming the S-shaped curves as it sinks to the seabed (Conflingo) . In shallow waters, the cable may be buried using a plough for additional protection, while in deep-sea sections, the S-shape and the cable's own weight provide sufficient safety (Telegeography) .
Benefits of the S-Shape
- Stress Absorption: The curves allow the cable to flex under mechanical stress, reducing the risk of breakage.
- Durability: By avoiding tight, straight lines, the cable can withstand long-term environmental pressures.
- Maintenance and Longevity: The slack reduces the likelihood of damage, ensuring stable global internet connectivity over decades (Sino-Conn) . In summary, the S-shape is a critical engineering solution that balances the cable's structural integrity with the dynamic conditions of the ocean floor, ensuring reliable and long-lasting data transmission between continents.
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Lower loss: Optical fiber has lower attenuation (loss of signal intensity) than copper conductors, allowing longer cable runs and fewer
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Submarine communications cable
OverviewModern historyEarly history: telegraph and coaxial cablesImportance of submarine cablesVulnerabilities of submarine cablesEnvironmental impactSee alsoFurther reading
In the 1980s, fiber-optic cables were developed. The first transatlantic telephone cable to use optical fiber was TAT-8, which went into operation in 1988. A fiber-optic cable comprises multiple pairs of fibers. Each pair has one fiber in each direction. TAT-8 had two operational pairs and one backup pair. Except for very short lines, fiber-optic submarine cables include repeaters at regular intervals.
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Optical fiber s are made from either glass or plastic. Most are roughly the diameter of a human hair, and
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