Viavi Solutions is trading 47.34% up at $53.63 after unveiling 1.6T data-center and AI-fabric testing tools at ECOC 2026. - The portfolio supports 400G, 800G and 1.6T connectivity upgrades. - It includes transceiver, Ethernet, silicon-photonics and fiber-testing solutions. - The announcement strengthens Viavi Solutions’ positioning in high-growth AI infrastructure and optical networking, providing a clear company-specific catalyst for the sharp after-hours move.