Network flexibility and automation is the top priority for the service providers in China, Europe, Japan and North America, interviewed by LightCounting. Metro and access networks will require the most upgrades to keep up with traffic growth. 

      1. CSPs will continue to rely on higher data rate systems to improve the cost and power consumption efficiency of their future DWDM systems, but it will be a gradual process. 100/200G DWDM will be widely adopted in access and aggregation networks, which rely  on 10G today. New metro and long-haul telecom networks will move to 400G and beyond, but demand for 100/200G ports will remain solid for the next 5 years.

      2. Deployments of high fiber count cables and use of C+L bands are also important. Use of multi-core fibers will be limited to sub-marine systems. 

      3.We expect that a separate optical transport layer will remain the most critical component of DWDM networks for CSPs and deployments of IP over DWDM will be limited to a few selected cases.

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