After several years during which high speed coherent network deployments have been shifting from 100G/200G to 400G links using the C-band we are now seeing a significant move towards higher speeds and more use of multiband solutions. Multiple communications service providers (CSPs) in leading markets have successfully upgraded core network links using first-generation 800G coherent solutions and more will upgrade as a second generation of 800G coherent solutions that are pushing the reach for 800G coherent interfaces to over 2,000 km become available. At the same time multiple carriers are deploying multiband solutions, doubling fiber capacity by using both the C-band and L-band. In parallel, several companies have introduced solutions that increase the width of the C-band and L-band, increasing capacity of each band by up to 50%.
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