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The Evolving Needs of Dispersion Testing in Today’s Next-Generation Networks

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The Evolving Needs of Dispersion Testing in Today’s Next-Generation Networks

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  • Author: Francis Audet, Jon Bradley
For many years, chromatic dispersion (CD) or polarization mode dispersion (PMD) testing was required for ultra-long-haul (ULH) submarine and terrestrial environments. While the network topology-comprised of the metro-edge network and the core or long-haul network-remains the same, a new topography for a broader CD and PMD testing landscape has emerged due to high-speed 40G and ROADM technology: the short-haul or metro and edge network. Known for its shorter distances, the absence of amplifi ers and its once-low data rate, this type of network does not require CD and PMD testing. With new ROADM deployment and 10G/40G/100G, there is a shift in the requirements to test CD and PMD in metro areas. Today, CD and PMD testing need to be optimized for both metro and core networks.

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