MPO · Multi-fiber Push-On
The multi-fiber connector terminating parallel-lane optics; its base-N grouping and polarity scheme decide whether the fiber plant survives the next lane-rate generation or has to be re-pulled.
Current numbers
16 fibers800GBASE-DR8 over MPO-16/OS2: eight parallel single-mode lanes / 16 fibers; later reuse requires an application-specific qualified migration map