Exhibit 99.1 VIAVI Announces Second Quarter Fiscal 2026 Results Chandler, Arizona, January 28, 2026 — VIAVI (NASDAQ: VIAV) today reported results for its fiscal second quarter ended December 27, 2025 with the following highlights. Second Quarter "VIAVI's performance for the second quarter came in at the high end of our guidance, driven by strength across most of our end markets. We expect the strong momentum and demand in the data center ecosystem and aerospace and defense applications to continue driving o ...