search.noResults

search.searching

dataCollection.invalidEmail
note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
ANALYSIS & OPINION: NEXT GENERATION OPTICAL ACCESS


Additionally, 25G is a simple TDM technology which does not require expensive tunable lasers.


Clear use cases Regarding market needs, the second factor required for 25G PON to be successful is ensuring there are clear use cases for 25G, including residential, business and 5G anyhaul. The residential market provides the opportunity for aggregation of Gigabit services on high-density PON, including headroom (reserve) for speed tests. In the business sector, 25G will allow full 10G services or higher, extending the service offering to enterprises. As we move towards the 5G era, 25G will


be needed for anyhaul. Although XGS-PON or 10G PTP can efficiently address midhaul and backhaul, 25G PON will be needed in situations with higher density (more cells per PON) and higher throughput per cell due to the increase in RF bandwidth and MIMO antenna layers. 25G PON is in line with mobile network evolution, as 25G physical interfaces will be used in centralised and distributed units. Finally, IEEE standardised EPON


technologies – typically used by cable operators – are already working on a 25G standard, which telcos following ITU steam standards need to counter. 25G will enable them to do so effectively.


The other side of the story As usual, the industry is looking at various options for PON evolution. 50G PON, for example, has been proposed but brings with it challenges of a premature ecosystem which will not be improved before 2025. There is also no visibility around the


types of services that are likely to drive 50G bitrates. Another solution being considered


is 2x10G bonding on two non-tunable wavelengths. This solution uses one GPON wavelength and one XGS wavelength. Unfortunately, this approach brings higher costs (twice the 10G optics), increased complexity and lacks the ability to co-exist with current GPON deployments, so there is no market traction. Similar problems can arise with approaches


that leverage 2xTWDM tunable wavelengths bonding. TWDM is already expensive; to bond the wavelengths requires two lasers


Figure 1: PON’s history of leveraging technologies matured in other domains


in the ONU, making it even more cost- prohibitive for massive deployments.


A new hero 25G PON clearly emerges as the most efficient way to evolve fibre networks beyond 10G PON. It is a simple technology that uses a single wavelength and no tunable lasers. It can co-exist with GPON along with XGS-PON and it offers increased bitrates of 25Gb/s downstream and 25Gb/s or 10Gb/s upstream. It is also based on mature optical technologies and an evolved ecosystem which will enable the technology to be brought to market faster. It addresses the higher density residential, business and anyhaul needs in the near term, while countering the competitive threat of 25G EPON and cable operators. The 25G PON technology is making


progress, with the first demos completed. As a leader in next-generation PON, we have introduced the industry’s first 25G PON proof of concept for anyhaul on commercially deployed ISAM FX access nodes. These demos have been carried out by a Tier-1 operator in the US and a Tier-1 operator in Japan, showing how 25G PON can carry 5G midhaul traffic from the actual Nokia Airscale nodes. It was exciting to see the potential of the technology to drive up speeds and converge all services on one fibre network. n


Ana Pesovic is Nokia's fixed networks marketing director


www.fibre-systems.com @fibresystemsmag Issue 23 n Spring 2019 n FiBRE SYSTEMS 21


25G PON CLEARLY EMERGES AS THE MOST EFFICIENT WAY TO EVOLVE FIBRE NETWORKS BEYOND 10G PON


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32
Produced with Yudu - www.yudu.com