BT's IP-over-DWDM move

• BT will roll out next year IP-over-DWDM using pluggable coherent optics in its network
• At ECOC 2022, BT detailed network trials that involved the use of ZR+ and XR optics coherent pluggable modules

Telecom operators have been reassessing IP-over-DWDM with the advent of 400-gigabit coherent optics that plug directly into IP routers.

According to BT, using pluggables for IP-over-DWDM means a separate transponder box and associated 'grey' (short-reach) optics are no longer needed.

Until now, the transponder has linked the IP router to the dense wavelength-division multiplexing (DWDM) optical line system.

"Here is an opportunity to eliminate unnecessary equipment by putting coloured optics straight onto the router," says Professor Andrew Lord, BT's head of optical networking.

Removing equipment saves power and floor space too.

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