The commercialization of 400G coherent pluggable optics in QSFP-DD and OSFP form factors has sparked a resurgence of interest in integrated colored optics in routers, known as IP over DWDM, or IPoDWDM. To date, IPoDWDM is dominated by hyperscalers, but some leading-edge communications service providers (CSPs) have followed the hyperscalers’ lead. Longer term, the real opportunity among CSPs is with high performance coherent pluggable variants generally referred to as ZR+. The ZR+ pluggable optics provide greater reach and the ability to run over telecom operators’ reconfigurable optical add-drop multiplexer (ROADM)-based line systems.
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