• Sumitomo Electric joined AFL, Corning, TeraHop in completing the SDM4 Multicore Fiber MSA, releasing Version 1.0 specifications.
• Agreement sets a common four-core multicore fiber baseline for AI data centers, campus networks, short-reach optical links.
• Spec targets multi-vendor interoperability, positioning the design as a reference for future international standard-setting work.
• Key parameters include 125 µm cladding, 2×2 core layout, O-band performance, crosstalk of −40 dB or less at 1 km.

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