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New cloud services, the internet of things and the evolution of mobile networks towards 5G are driving capacity needs in the metro to unprecedented levels. In an effort to overcome bandwidth bottlenecks, reduce cost and ensure scalability, more and more network operators are now turning to flex-coherent technologies. Total capacity and lowest cost per bit are two critical metrics in the metro. That's why software-defined, flex-coherent optics - which can efficiently carry 100G, 200G and even up to 600G of capacity on a single wavelength - are so important for metro applications ...