Alcatel Submarine Networks Upgraded Fiber Sensing Tech
New methods for monitoring long-haul subsea cables could mitigate the financial toll of frequent physical failures.
Updated on Sept. 26, 2026 in Telecommunications
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Alcatel Submarine Networks has announced an upgrade to distributed acoustic sensing technology designed to monitor entire transoceanic fiber cables. The research-stage system aims to expand current sensing capabilities, which are currently limited to only the first 200 kilometers of a line.
Why it matters
With 150 to 200 subsea cable accidents occurring annually due to threats like anchoring and fishing, the industry faces significant, recurring repair costs. Enhanced monitoring could reduce these expenses by providing earlier detection of physical interference across the full length of a cable.
Current distributed acoustic sensing reaches 200 kilometers, while the proposed upgrade uses wavelength-division multiplexing to monitor transoceanic spans of 6,000 to 20,000 kilometers. This sensing approach relies on interrogator boxes that measure phase changes in laser light.
The players
Alcatel Submarine Networks
A France-based leader in the subsea cable industry specializing in the design, manufacturing, and installation of optical fiber infrastructure.
International Telecommunication Union
The United Nations agency for information and communication technologies that tracks global telecommunications infrastructure and standards.
The details
Distributed acoustic sensing works by sending laser light down an optical fiber; an interrogator box then analyzes returning phase changes to detect vibrations from nearby physical threats, such as anchors, within a 2-kilometer radius. The enhanced system utilizes wavelength-division multiplexing—a method of combining multiple signals into a single fiber using different light wavelengths—to extend this detection capability across the entire length of transoceanic cables.
Timeline
2007: Anchoring was officially banned in the Perth cable protection lane.
March 2024: Four subsea cables were cut off the coast of West Africa.
August 2026: Indigo West and Indigo Central cables failed near Australia.
The Tech Race
This development addresses the persistent challenge of cable vulnerability documented by the International Telecommunication Union's annual accident reports. It represents a shift from localized 200-kilometer monitoring to full-length protection, aimed at reducing the high repair costs inherent in the subsea communications market.
The technology aims to improve the reliability of international data traffic by detecting cable threats before total failure occurs. While the repair cost of these systems is currently 20 times higher than the sensing hardware itself, implementation timelines for this upgrade remain unannounced.
The takeaway
The industry is moving toward end-to-end monitoring to mitigate the substantial costs associated with cable repairs. Watch for upcoming announcements regarding the rollout schedule for this wavelength-division multiplexing sensing system to see if it stabilizes major subsea routes.
Further reading
For more on the current state of global network infrastructure, visit our Telecommunications section.
Source note: This article includes information reported by IEEE Spectrum: Technology, Engineering, and Science News.
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