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FEATURE: NEXT GENERATION OPTICAL ACCESS


A TECHNOLOGY THAT MAKES THIS BUILDING PROCESS SIMPLER AND LESS EXPENSIVE IS OF GREAT INTEREST TO ALL NEW ENTRANTS


Requiring less fibre for networks spanning entire metropolitan areas allows the use of lower cost microtrenching technologies.


consensus-building session the next day, 19 people affiliated with 15 different companies expressed interest in participating. IEEE 802.3 approved the creation of the ‘IEEE 802.3 Physical Layers for increased-reach Ethernet optical subscriber access (Super-PON) Study Group’ on the meeting’s final aſternoon. ‘Te Study Group can then evolve into a task force, where the actual standard, i.e. the solution to the problem, is developed,’ said DeSanti.


Economic synergy Te Super-PON Study Group approved the formation of a task force in November in Bangkok, Tailand. ‘29 individuals affiliated with 23 different companies participated,’ explained DeSanti. ‘Tese affiliated companies include system vendors, silicon component vendors, optical component and cable vendors, and network operators. Te request to form the IEEE P802.3cs Task Force was approved by the IEEE 802.3 plenary with a 100 per cent consensus. Tis demonstrates a significant buy-in by individuals with affiliations across the industry. Participation in study group meetings has been above expectations.’


www.fibre-systems.com @fibresystemsmag Issue 23 n Spring 2019 n FiBRE SYSTEMS 17 Te group aims to take advantage of


wavelength division multiplexing (WDM), which is already commonly used in backbone and metro networks. However, WDM has historically been less common in access networks because it is more expensive than alternative time division multiplexing (TDM)


approaches. But using WDM enables one fibre to carry multiple PON instances ‘just by mapping each instance to a different wavelength and in this way increase the number of customers supported,’ Lam explained. ‘As an example, by using 16 different wavelengths, it is possible to transport 16 PON instances, each supporting 64 customers, for a total of 1,024 customers per fibre exiting the central office.’ Tis 1:64 split ratio means the cost of the central office is spread across more customers, lowering the overhead for each of them. Super-PON is also incorporating


downstream and upstream amplification, which makes its extended reach possible by increasing optical signal strength. Tis helps overcome the progressive losses that limit reach on weaker signals. Additionally, Super-PON seeks to achieve bit error rates (BERs) beter than or equal to 10-12 at the Media Access Control/Physical Layer Signalling (MAC/PLS) interface, where the data link


Using Super-PON allows network operators to serve a metropolitan area with fewer central offices


g


HLundgaard, used via Wikimedia CC BY-SA 3.0 licences


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