Submarine Cable Networks

Discover how EDFA pump redundancy and pump farming are used to strengthen the resilience of submarine cable repeater systems. Explore how EDFAs amplify optical signals across vast undersea distances, why laser pump failures pose a critical risk, and how different redundancy configurations can distribute pump resources to improve fault tolerance and help keep submarine cable traffic running.

Since the first optical submarine cable in 1988, copper has been the default conductor material due to its low resistance and reliability. However, aluminum is emerging as a lighter, more cost-effective alternative. Analysis shows that an aluminum conductor with equivalent resistance weighs ~50% less and costs ~87% less than copper, while delivering comparable performance. This significant reduction in cost and weight simplifies cable installation and fault recovery, making aluminum a compelling choice for future large-scale subsea deployments.