400G growth will be faster than expected, Cignal AI says The market for coherent 400G WDM is likely to develop much faster than previously projected, based in part on the expectation that 400G ZR technology will make it significantly easier to transition from 100G and 200G, according to Cignal AI. But first, more suppliers will need to commercialize their 400G ZR technologies. At the moment, only Ciena is manufacturing 400G ZR products in volume.(Fierce Telecom)