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Over the past several years, 400ZR and IP-over-DWDM have been prominent topics at OFC. 2021’s show featured concepts and prototypes, while 2022’s OFC focused on shipment announcements and interop testing. The question for OFC 2023 is – will 400ZR and its variants (collectively referred to as 400ZRx) finally usher in the long-awaited era of IP-over-DWDM? 

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