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ANALYSIS & OPINION: NEXT GENERATION OPTICAL ACCESS


ANOTHER DIMENSION


A look at the evolution of fibre networks beyond 10G PON ANA PESOVIC


AS THE DEPLOYMENT OF DATA CENTRES INCREASES, SO WILL THE VOLUME OF 25G OPTICS, BRINGING DOWN THE COST POINT


P


ON technologies have always had the ability to reinvent themselves and adapt to new market needs. From record breaking speeds, to dual-rate


bitrates and multiple lambdas – PON has always emerged as a broadband hero that enables widespread adoption of new services and enhances operators’ businesses. As we start building 5G mobile networks,


a new chapter of the PON story is being created. This time, the next PON technology is embracing a new paradigm to achieve higher capacity more efficiently. Leveraging the data centre ecosystem –


rather than the transport systems that PON technologies have historically used – 25G PON represents the next stage in fibre evolution and a new dimension to the PON story.


Setting the scene for 25G PON There are two requirements for an access technology to be successful: cost-efficiency and market demand. In massive access network deployments, the former is key.


20 FiBRE SYSTEMS n Issue 23 n Spring 2019


Leveraging mature eco-systems and high- volume optical technologies helps achieve cost-efficiency, along with feasible further cost improvements based on research and innovation. The commercial success of 25G PON


will depend on its ability to deliver 2.5x more bandwidth than 10G PON at a small incremental cost. Fortunately, 25G PON is the most cost-efficient way to evolve beyond 10G PON, because it will leverage the high volume of 25G optical technologies that are used to interconnect data centres. As the deployment of data centres


increases, so will the volume of 25G optics, bringing down the cost point. Of course, it is not possible to just plug these data centre components into Optical Line Terminal (OLT) and Optical Network Unit (ONU) transceivers; PON applications will require new wavelengths, higher launch power from transmitters, and greater sensitivity from receivers. However, this is no different than previous


PON generations’ adoption of components from long-haul and metro transceivers.


www.fibre-systems.com @fibresystemsmag


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