FEATURE NEXT-GENERATION PON
exotic, but there were three main contenders: XGPON1 – which is also known as 10-Gigabit GPON – WDM-PON, and TWDM-PON. Pesovic concluded: ‘Tis meant comparing
the bandwidth available for each technology; the convergence of services; unbundling possibilities, which is very important especially in Europe; and also co-sharing and co-investment.’ One of the reasons costs for NGPON2 are
manageable is that PON can be initially deployed using a single wavelength pair, which can then be increased as the needs of the business grow. Pesovic said: ‘With this one wavelength which you would start with you can define the same bandwidth that you have in XGPON1, which is 10 gigabit up, 2.5 gigabit down or 10/10 so you can do even better and then in the future you can just add an additional wavelength at a very small cost.’ Tis provides the performance of XGPON1
at a similar cost but with a much higher potential for growth in the future, as more wavelengths can be added. Tese can be defined separately so one could be used to serve business customers that require high bit
rate symmetrical services, while a smaller bandwidth could be used to serve residential customers. From Alcatel-Lucent’s perspective, the
deployment of TWDM-PON is very straightforward, as Pesovic explained: ‘TWDM, for us, will be implemented in already existing access nodes, which is what makes our implementation special because, as
Today it’s about getting the volume to reduce costs
far as we know, we are the only company that can do that on the existing fibre platform.’ Recently Huawei announced the successful
trial of 100G passive optical network (100G-PON) through its optical access innovation lab. Te new 100G-PON technology also uses a hybrid time-division and wavelength-division architecture but at a
@fibresystemsmag |
www.fibre-systems.com
higher bit rate on each downstream wavelength. Tus the system supports a 4x 25 Gb/s downstream rate and fx 10 Gb/s upstream rate. Hauwei says its 100G-PON technology is compatible with GPON, 10GPON and 40G TWDM-PON, allowing carriers to upgrade their existing networks. Although only in the prototype stage, this
technology could be a route for a future generation of PON technology as consumers’ demands for data continue to grow. However, some people have reservations that this technology is in a similar position to XGPON1, in that the demand for bandwidth is just not there at this time. It remains to be seen whether data rates grow fast enough for this technology to become viable, or if it will be swallowed by the next big thing a few years down the line. Robert Conger explained: ‘One of the
biggest challenges with all of these technologies is to get the cost reduced to the point where it can be mass market adopted and not be a very niche technology. To do that, you need volume; and so coming up with different really high-rate solutions that may show well
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