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Coming together Te 25GS-PON MSA Group was founded by 10 members, including Nokia, alongside AOI, Chorus, Chunghwa Telecom, Ciena, MACOM, MaxLinear, NBN Co., Sumitomo Electric Industries and Tibit Communications. Since its launch at the end of 2020, the group has added to its number, with members such as AT&T, CommScope, Cortina Access, CableLabs, HiLight Semiconductor, Hisense Broadband, SiFotonics and Semtech, to name just a few. According to Jeff Heynen, vice president, broadband access and home networking for Dell’Oro Group: ‘Te addition of such a wide range of network operators, equipment vendors, and component suppliers to the 25GS-PON MSA is evidence of the technology’s importance for 5G xHaul and enterprise services. 25G PON’s ability to co-exist with XGS-PON and reuse existing fibre plant makes it extremely atractive to operators around the world.’ Ken Jackson, product marketing director at
founding member company Sumitomo Electric, offered his view: ‘We believe that 25G PON is the next step in higher bandwidth networks that can support 5G. Tat’s the big thing, everyone’s trying to address the 5G networks. 25G PON is essentially backward-compatible with the XGS PON and the previous generations of PON. Tat’s very helpful for operators who don’t want to install additional complexity in their networks as it allows them to seamlessly upgrade their networks
by just changing the ends, not the network itself.’ Rag-Chen Yu, senior vice president at member
company, SiFotonics concurs. ‘Looking at 5G, suddenly, this is a much higher bandwidth available to end customers and users and mobile phone applications. So bandwidth expansion certainly is a one key requirement for the network infrastructure.’ Te challenge on the service provider side,
however, is the need for fibre densification for 5G network builds. ‘Basically, you need to upgrade networking speed with much broader coverage,’ said Yu, ‘because when you upgrade the speed, the antennas and the towers, coverage needs to be a lot denser especially for densely populated areas. Before you can cover, for example, a 10km range, now probably need to shrink that size to deliver higher speeds. Tat means you’re going to need a lot more connections. I think 25G PON is one of the technologies that will allow you to deploy those bandwidths to towers, particularly to the so called micro sites – basically, you need to reach a lot more to the antennas at a much more competitive cost compared to alternatives.’
No disruption Te benefit to the 25GS-PON standard, explained Sumitomo Electric’s Jackson, is coexistence. ‘Te 25GS-PON uses wavelengths that make it compatible with coexistence,’ he said. ‘Tat simply means that the previous generations of PONs occupy different wavelengths than the 25GS-
THE FUTURE OF PON NEW WHITE PAPER
PON. So a network operator can upgrade to 25G almost on an individual or customised basis and they can do it without disrupting their existing customers that are maybe on the 10G wavelength grid.’ Yu acknowledged the alternative technology
and standard. ‘Tere’s a competing standard, 50GS PON, but that’s a lot tougher and takes a lot longer to develop and deploy in high volume. So there’s also a pragmatic side of things in terms of 25GS-PON versus other versions because it allows faster deployment using relatively mature developed technologies. For example, we have developed an advanced germanium silicon detector to allow us to leverage the deployment we’ve already done in the far East 5G market of 25G mobile networking fronthaul transport. Tis is already high-volume and if we can leverage on those already deployed technologies, and we repurpose it to 25GS-PON, that will really help the new technologies to get deployed in the U.S. market.’ Looking ahead, Jackson believes that a good
way to predict the future beyond 25G PON is to look at the past. ‘Look at the 10G PON deployments and how long that took,’ he said. Generally speaking, there’s early work so I can imagine specification development and early prototypes can happen in the next year or two. But to actually start seeing shipments of 50 or 100G PON I think you’re talking about three to five years at the earliest.’n
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Te industry is already working on further evolutions beyond 10 Gb/s. Te next generation of PON technologies are essential to meet ever-growing bandwidth demand and ensure that the fibre networks built out today can be used for decades to come. Tis paper examines the future PON fibre technologies beyond 10Gb/s.
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