Looks like coherent 100G in the QSFP28 form factor is finally on the horizon.
From the datasheet: * 100G coherent DWDM in QSFP28 form factor * tunable, flexible grid * 300 km with amplification, 120 km without * industrial or commercial temperature * 5 watts https://www.adva.com/en/products/open-optical-transport/pluggables-and-subsystems/coherent-100zr - Jared
