Abstract: In WDM optical networks, the physical layer impairments (PLIs) and their significance depend on network type-opaque, translucent, or transparent; the reach-access, metro, or core/long-haul; ...

April 24, 2026 • The European Union on Thursday approved a $106-billion loan package to help Ukraine meet its economic and military needs for two years, ending months of political deadlock. April 23, ...