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Tower Semiconductor and Coherent demonstrated 400Gbps/lane data transmission using a silicon modulator in Tower's production-ready SiPho process, achieving a clear open eye at 420 Gb/s PAM4 with Coherent’s InP CW high power laser. This breakthrough targets next-generation 3.2T optical transceivers for pluggable and Co-Packaged Optics in AI datacenter connections.