400G ZR & 400GZR+

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 The Optical Internetworking Forum (OIF) who created the 400ZR standard. 400ZR is targeted towards edge and relatively short reach, up to 120km DCI applications. Around the same time, the OpenROADM Multi-Source Agreement (MSA) also defined a specification for a 400G DWDM pluggable. Their specification focused on what service provider networks would need, such as long optical reach (>120km), advanced forward error correction (known as oFEC) and selectable data rates (100G, 200G, 300G, or 400G). Though the additional capabilities were achievable, it would require more power than the 15W specified for ZR. Therefore, OpenROADM’s specification became known as ZR+.

Ultimately, between the two organizations and the various optics manufacturers, they agreed to take the best of the OIF and OpenROADM standards, combine them and call it OpenZR+. By combing the features of each in the same form factor, it leaves us with one highly versatile coherent DWDM optic, as illustrated in Figure. 

 

 

combination of the 400ZR and OpenRoadm standards 

 

400G DWDM rates and distance 


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