Updates from Ciena

Simplifying Open Submarine Cable Link Engineering
How can a new and better way to perform submarine cable link budgeting address challenges associated with the open submarine cable model? Brian Lavallée explains why the submarine network industry is moving towards these new metrics and how you can learn more in our new handbook.
By Brian Lavallée – Terrestrial networks leverage many optical line amplifiers and Reconfigurable Optical Add-Drop Multiplexer (ROADM) nodes to construct end-to-end networks. Fortunately, terrestrial amplifier and ROADM nodes are relatively simple to monitor to determine how each section contributes to end-to-end service performance, as each of these network elements provides a rich set of measured data.

Submarine cable systems are far more challenging because submerged repeaters (historical misnomer referring to optical amplifiers) and branching units provide only basic health status information. This design philosophy reduces the component count of undersea optoelectronics providing a higher overall reliability, which is a fundamental design goal of wet plants, because once deployed, they’re extremely expensive and time-consuming to repair. Given the limited information provided by most wet plants, end-to-end service performance must be determined from information provided by Submarine Line Terminal Equipment (SLTE) coherent optical modems connected at each end of a submarine cable.

The Open Submarine Cable business model

The industry is operating in a “quasi-open” submarine cable environment in that operators can and typically do select their wet plant from one vendor and their SLTE from another vendor, often much later, as wet plants take years to go from the designed to deployed stage. This quasi-open model allows operators to choose the latest and greatest SLTE, when and where needed, over the entire lifecycle of their wet plant allowing them to design and deploy a best-in-breed network tailored to their unique business requirements. more>

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