Summer 2018 Optical Connections Magazine


Angola Cables Introduces New Spectrum Sharing Capabilities on MONET Cable

Angola Cables, a dedicated wholesale carrier based in West Africa, is offering its customers customized amounts of capacity with Ciena’s GeoMesh Extreme Spectrum Sharing capability. The operator is making available differentiated virtual fibre pairs, which are dedicated and upgradeable portions of the overall optical spectrum, to end- users over a shared physical fibre pair. Customers can access Angola Cables’ spectrum sharing capability on the MONET subsea cable, which is now live between Boca Raton, Florida and São Paulo, Brazil, with a branching unit extension to Fortaleza, Brazil. Angola Cables is one of the leading capacity providers for the African West Coast and is also a service provider on the MONET subsea cable, an Open Cable system, where each consortium member can select the submarine line terminals for its cable fibre pairs, providing customers

increasing capacity demands. Leveraging programmable infrastructure and software control for scale, self- configuration and optimisation, an adaptive network ensures subsea networks can truly adapt to change in network environments and respond accordingly.”

submarine operators like Angola Cables are taking note of new ways to get the most out of their existing assets to continue to differentiate service offerings. At Ciena, our Adaptive Network vision guides submarine network providers’ efforts to aid their customers in addressing

greater flexibility and choice of technology. Its customers can manage their own traffic and submarine line terminal equipment (SLTE) without the risk of impact to and from other users sharing the common open cable system. The primary benefit of Ciena’s Spectrum Sharing capability is that it provides secure, cost-effective, and reliable connectivity in the form of highly flexible spectrum partitioning allowing Angola Cables to offer virtualised fibre pair products to their end- customers. Last year, Angola selected Ciena’s GeoMesh Extreme with WaveLogic Ai and Blue Planet solutions and services to support its new service launch on the MONET subsea cable. The 10,556 km route currently provides more than 25 Tbps of traffic on Angola Cables’ network between the US and Latin America’s major business hub of São Paulo, Brazil. Ian Clarke, vice president, Global Submarine Systems at Ciena says, “Innovative

Angola Cables lays the cable to Brazil in 2017

Laser frequency combs could become future of Wi- Fi, say Harvard researchers

which has a technological significance for efficient use of bandwidth in communication systems.” Frequency combs are widely- used, high-precision tools for measuring and detecting different frequencies of light. Unlike conventional lasers, which emit a single frequency, these lasers emit multiple frequencies simultaneously, evenly spaced to resemble the teeth of a comb. Today, optical frequency combs are used for everything from measuring the fingerprints of specific molecules to detecting distant exoplanets.

A new discovery by scientists at Harvard’s John A Paulson School of Engineering & Applied Sciences has the potential of significantly increasing the capacity of wireless communications. Wi- Fi and cellular data traffic are increasing exponentially but, unless the capacity of wireless links can be increased, all that traffic is certain to lead to unacceptable bottlenecks in networks worldwide, say the scientists. Upcoming 5G networks are a temporary fix but not a long-term solution. For that, researchers have focused on terahertz frequencies, the

submillimetre wavelengths of the electromagnetic spectrum. Data traveling at terahertz frequencies could move hundreds of times faster than today’s wireless. In 2017, researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) discovered that an infrared frequency comb in a quantum cascade laser could offer a new way to generate terahertz frequencies.

integrated transmitters or receivers that can efficiently encode information. The research has been published in the journal Optica.

“This work represents a complete paradigm shift for the way a laser can be operated,” said Federico

Capasso, the Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering and senior author of the paper. “This new phenomenon transforms a laser — a device operating at optical frequencies — into an advanced modulator at microwave frequencies,

Now, the same team has uncovered a new

phenomenon of quantum cascade laser frequency combs, which would allow these devices to act as


| ISSUE 13 | Q2 2018

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