We have a dark fiber cable between two data centers and are looking to set up a 400Gbps diverse path between the two sites. I am looking for WDM solution recommendations since I am fairly new to them in general. I did a bit of research and see there are CWDM and DWDM solutions and they vary greatly in costs and setup. The distance of the dark fiber is probably around 20km from the estimate I was given, but does the distance matter in terms of the solution? Do I need to go with an active solution (versus passive) based on this distance? I think we are looking to have (4) 100Gbps interfaces from the solution we implement. Can anyone provide any recommendations they have set up or have knowledge of? I looked into Ciena equipment since they seem to be the standard in DWDM solutions but not sure if the price is worth it.
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