Hollow-Core Fibre: The Route to a Faster Future?

Tim Passingham


Subscribe Contact us

Authors


The demand for lightning-fast broadband


As we continue to recover from the COVID-19 pandemic, demand is higher than ever for services that require lots of data. For most of us, this is most noticeable in the home: remote working, gaming, online video streaming.


While 95% of UK premises have access to superfast broadband (30 Mb/s), the race is now on to provide nationwide access to ‘gigabit’ broadband (1 Gb/s) by 2030, as per the government’s commitment in this year’s Levelling Up white paper. Old copper networks are unable to deliver such high speeds and are therefore being systematically phased out by single-mode optical fibre (SMF), which is being deployed at pace in FTTP access networks around the globe.


This copper-to-fibre upgrade represents a pivotal moment in the history of telecommunications in the UK and beyond, as we move away from infrastructure that has been in place for over a century. Many industries and services are ever-reliant on higher speed connectivity. 


Is SMF the best solution, or are we overlooking a better alternative?

Fibre optics

The emergence of hollow-core fibre


Conventional SMF in global use today passes light through a single fibre strand made from glass. Albeit incredibly pure and refined, there is no getting away from the fact that light travelling through glass will always travel slower through this medium than through a vacuum—as well as being affected by attenuation. This is where hollow-core fibre (HCF) technology offers greater promise, chasing a seemingly impossible solution to limitations governed by the fundamental laws of physics: by enabling the light to be transmitted via air or a vacuum.


HCF technology has improved since its emergence in the late 1990s, yet the central concept remains the same: an optical fibre guiding light through a hollow core (air or vacuum) with a lower refractive index than any single-mode core. Running the signal through an air-filled rather than glass-centre channel means the signal speed can be maintained at 99.9% of the speed of light (300 km/s), rather than at 66%. While there are now nuances in design and construction, the best performing HCF to date is the double-nested antiresonant nodeless fiber (DNANF) recently developed by Lumenisity, an offshoot from the University of Southampton’s Optoelectronics Research Centre (ORC).


Aside from transmission speed, another critical performance indicator of an optical fibre is its attenuation value, a measure of the light signal lost between input and output. First reported in March of this year, Lumenisity’s DNANF achieved attenuations of 0.22 dB/km at 1310nm (O-band) and of 0.174 dB/km at 1550nm (C-band), matching that of commercial SMF at some frequencies (C-band) and surpassing it in others (O-band). This recent ground-breaking development has further pushed HCF into the spotlight, with various industries now considering possible applications of the technology in their fields.

Fibre optics

Examining potential applications of hollow-core fibre


The excitement around HCF has led to a number of key trials which may shed light on the best use cases for Lumenisity’s CoreSmart® solution. One such trial was carried out in March by euNetworks. Using Lumenisity’s latest solution, the company installed a 7km route of HCF between the LON1 and London Stock Exchange data centres. Through 50% faster data transmission, latency was cut by 1/3 compared to SMF. This finding has huge implications for financial trading and is also of interest for gaming networks. Longer trial routes are now being planned, while there is confidence that the decreased latency can be maintained even with increased separation of data centres, an exciting prospect for both high frequency traders and hyperscalers.


Telecoms giant BT, in early testing with Mavenir, also noted that HCF’s faster transmission and reduced latency could help to lower mobile network costs, allowing greater distances between antennas and back-end cabinets and therefore larger areas to be served by fewer cabinets. In a different trial, instead with a focus on potential applications in quantum security, BT deployed a quantum key distribution (QKD) system using 6km of Lumenisity’s HCF solution. Reporting a reduction in latency and signal interference, the trial exposed the potential for HCF to be deployed in quantum communications, boosting security for data transmission through the safer delivery of quantum keys for quantum encryption. 


Another potential application of the technology is in laser machining. Experiments by Lumenisity’s Francesco Poletti and the ORC showed that 1kw of continuous laser power at 1070nm could be beamed through a 1km-long stretch of HCF, compared to SMF’s capacity of tens of metres at this wattage, avoiding the nonlinear effects seen with conventional SMF given the nested design that gives (D)NANF its name. This ability to deliver high-power beams over such distances could be a huge discovery for the field of laser machining.


Could hollow-core fibre change the face of FTTP?


HCF has been shown to match or better performance of conventional SMF at different wavelengths, showcasing improvements with attenuation, latency, nonlinearity and dispersion. The excitement around this new fibre technology in various industries is clear, but just how realistic is its application in FTTP access networks?


With a predicted increase of 10+ million live connections in the UK by 2025, the demand for fast and dependable fibre is ever-greater. Unfortunately, HCF technology cannot yet answer this demand, for a multitude of reasons. Not only is the geography of the UK very awkward, but to use HCF in FTTP access networks to increase broadband speeds would require rebuilding existing FTTP deployments. Still an emerging technology, HCF is not yet being manufactured in volume and so comes at an extreme price premium, which is not expected to change for several years. Currently HCF’s use in FTTP access networks in the UK and across the globe seems a very distant possibility. The ongoing evolution of PON and other technologies will also continue to increase the performance, speed and commercial lifespan of existing SMF, further pushing the goalposts for HCF.


So, although HCF’s use in the consumer access networks is some way off, we may see many core network and business applications starting to incorporate this technology.


What Cambridge MC can do to help


Having lived with and worked around the limitations of SMF for 40 years or so, HCF will provide a step-change in optical networking and the applications it can support.


These will have far-reaching impacts on digital transformation strategies that will be adopted by our enterprise clients. HCF is a truly fascinating new technology and, although still in its infancy, already demonstrates a capacity for lower latency networking in the years to come. It may be some time before we benefit from HCF in the home when gaming or streaming our favourite Netflix shows, but B2B applications of HCF are more likely, particularly with financial trading and data centres.


With a reputation for excellence and expertise in the telecommunications industry, Cambridge Management Consulting will continue to track this technology and many others as they emerge. We pride ourselves on being ahead of the curve, and our consultants are on many panels and boards that advise on and predict future technology trends. When commercial opportunities for HCF emerge, we will be able to advise your organisation on adoption strategies - for more information contact us.


About Us

Cambridge Management Consulting is a specialist consultancy drawing on an extensive network of global talent. We are your growth catalyst, assembling a team of experts to focus on the specific challenges of your market.


With an emphasis on digital transformation, we add value to any business attempting to scale by combining capabilities such as marketing acceleration, digital innovation, talent acquisition and procurement.


Founded in Cambridge, UK, we created a consultancy to cope specifically with the demands of a fast-changing digital world. Since then, we’ve gone international, with offices in Cambridge, London, Paris and Tel Aviv, 100 consultants in 17 countries, and clients all over the world.


Find out more about our telecommunication services and full list of capabilities.

Subscribe to our Newsletter

Blog Subscribe

SHARE CONTENT

Aerial shot of wind turbines
by Pete Nisbet 15 September 2025
Discover how businesses can drive value through sustainability by focusing on compliance, cost savings, and credibility—building trust, cutting emissions, and attracting investors | READ ARTICLE NOW
Abstract kaleidoscope of AI generated shapes
by Tom Burton 10 September 2025
This article explores the ‘Third Way’ to AI adoption – a balanced approach that enables innovation, defines success clearly, and scales AI responsibly for lasting impact | READ FULL ARTICLE
A Data centre in a field
by Stuart Curzon 22 August 2025
Discover how Deep Green, a pioneer in decarbonised data centres, partnered with Cambridge Management Consulting to expand its market presence through an innovative, sustainability‑driven go‑to‑market strategy | READ CASE STUDY
Crystal ball on  a neon floor
by Jason Jennings 21 August 2025
Discover how digital twins are revolutionising project management. This article explores how virtual replicas of physical systems are helping businesses to simulate outcomes, de-risk investments and enhance decision-making.
A vivid photo of the skyline of Stanley on the Falkland Islands
by Cambridge Management Consulting 20 August 2025
Cambridge Management Consulting (Cambridge MC) and Falklands IT (FIT) have donatede £3,000 to the Hermes/Viraat Heritage Trust to support the learning and development of young children in the Falkland Islands.
A modern office building on a wireframe floor with lava raining from the sky in the background
by Tom Burton 29 July 2025
What’s your organisation’s type when it comes to cyber security? Is everything justified by the business risks, or are you hoping for the best? Over the decades, I have found that no two businesses or organisations have taken the same approach to cybersecurity. This is neither a criticism nor a surprise. No two businesses are the same, so why would their approach to digital risk be? However, I have found that there are some trends or clusters. In this article, I’ve distilled those observations, my understanding of the forces that drive each approach, and some indicators that may help you recognise it. I have also suggested potential advantages and disadvantages. Ad Hoc Let’s start with the ad hoc approach, where the organisation does what it thinks needs to be done, but without any clear rationale to determine “How much is enough?” The Bucket of Sand Approach At the extreme end of the spectrum is the 'Bucket of Sand' option which is characterised by the belief that 'It will never happen to us'. Your organisation may feel that it is too small to be worth attacking or has nothing of any real value. However, if an organisation has nothing of value, one wonders what purpose it serves. At the very least, it is likely to have money. But it is rare now that an organisation will not hold data and information worth stealing. Whether this data is its own or belongs to a third party, it will be a target. I’ve also come across businesses that hold a rather more fatalistic perspective. Most of us are aware of the regular reports of nation-state attacks that are attempting to steal intellectual property, causing economic damage, or just simply stealing money. Recognising that you might face the full force of a cyber-capable foreign state is undoubtedly daunting and may encourage the view that 'We’re all doomed regardless'. If a cyber-capable nation-state is determined to have a go at you, the odds are not great, and countering it will require eye-watering investments in protection, detection and response. But the fact is that they are rare events, even if they receive disproportionate amounts of media coverage. The majority of threats that most organisations face are not national state actors. They are petty criminals, organised criminal bodies, opportunistic amateur hackers or other lower-level actors. And they will follow the path of least resistance. So, while you can’t eliminate the risk, you can reduce it by applying good security and making yourself a more challenging target than the competition. Following Best Practice Thankfully, these 'Bucket of Sand' adopters are less common than ten or fifteen years ago. Most in the Ad Hoc zone will do some things but without clear logic or rationale to justify why they are doing X rather than Y. They may follow the latest industry trends and implement a new shiny technology (because doing the business change bit is hard and unpopular). This type of organisation will frequently operate security on a feast or famine basis, deferring investments to next year when there is something more interesting to prioritise, because without business strategy guiding security it will be hard to justify. And 'next year' frequently remains next year on an ongoing basis. At the more advanced end of the Ad Hoc zone, you will find those organisations that choose a framework and aim to achieve a specific benchmark of Security Maturity. This approach ensures that capabilities are balanced and encourages progressive improvement. However, 'How much is enough?' remains unanswered; hence, the security budget will frequently struggle for airtime when budgets are challenged. It may also encourage a one-size-fits-all approach rather than prioritising the assets at greatest risk, which would cause the most significant damage if compromised. Regulatory-Led The Regulatory-Led organisation is the one I’ve come across most frequently. A market regulator, such as the FCA in the UK, may set regulations. Or the regulator may be market agnostic but have responsibility for a particular type of data, such as the Information Commissioner’s Office’s interest in personal data privacy. If regulatory compliance questions dominate most senior conversations about cyber security, the organisation is probably in this zone. Frequently, this issue of compliance is not a trivial challenge. Most regulations don’t tend to be detailed recipes to follow. Instead, they outline the broad expectations or the principles to be applied. There will frequently be a tapestry of regulations that need to be met rather than a single target to aim for. Businesses operating in multiple countries will likely have different regulations across those regions. Even within one country, there may be market-specific and data-specific regulations that both need to be applied. This tapestry is growing year after year as jurisdictions apply additional regulations to better protect their citizens and economies in the face of proliferating and intensifying threats. In the last year alone, EU countries have had to implement both the Digital Operational Resilience Act (DORA) and Network and Infrastructure Security Directive (NIS2) , which regulate financial services businesses and critical infrastructure providers respectively. Superficially, it appears sensible and straightforward, but in execution the complexities and limitations become clear. Some of the nuances include: Not Everything Is Regulated The absence of regulation doesn’t mean there is no risk. It just means that the powers that be are not overly concerned. Your business will still be exposed to risk, but the regulators or government may be untroubled by it. Regulations Move Slowly Cyber threats are constantly changing and evolving. As organisations improve their defences, the opposition changes their tactics and tools to ensure their attacks can continue to be effective. In response, organisations need to adjust and enhance their defences to stay ahead. Regulations do not respond at this pace. So, relying on regulatory compliance risks preparing to 'Fight the last war'. The Tapestry Becomes Increasingly Unwieldy It may initially appear simple. You review the limited regulations for a single region, take your direction, and apply controls that will make you compliant. Then, you expand into a new region. And later, one of your existing jurisdictions introduces an additional set of regulations that apply to you. Before you know it, you must first normalise and consolidate the requirements from a litany of different sets of rules, each with its own structure, before you can update your security/compliance strategy. Most Regulations Talk about Appropriateness As mentioned before, regulations rarely provide a recipe to follow. They talk about applying appropriate controls in a particular context. The business still needs to decide what is appropriate. And if there is a breach or a pre-emptive audit, the business will need to justify that decision. The most rational justification will be based on an asset’s sensitivity and the threats it is exposed to — ergo, a risk-based rather than a compliance-based argument. Opportunity-Led Many businesses don’t exist in heavily regulated industries but may wish to trade in markets or with customers with certain expectations about their suppliers’ security and resilience. These present barriers to entry, but if overcome, they also offer obstacles to competition. The expectations may be well defined for a specific customer, such as DEF STAN 05-138 , which details the standards that the UK Ministry of Defence expects its suppliers to meet according to a project’s risk profile. Sometimes, an entire market will set the entry rules. The UK Government has set Cyber Essentials as the minimum standard to be eligible to compete for government contracts. The US has published NIST 800-171 to detail what government suppliers must meet to process Controlled Unclassified Information (CUI). Businesses should conduct due diligence on their suppliers, particularly when they provide technology, interface with their systems or process their data. Regulations, such as NIS2, are increasingly demanding this level of Third Party Risk Management because of the number of breaches and compromises originating from the supply chain. Businesses may detail a certain level of certification that they consider adequate, such as ISO 27001 or a System & Organization Controls (SOC) report. By achieving one or more of these standards, new markets may open up to a business. Good security becomes a growth enabler. But just like with regulations, if the security strategy starts with one of these standards, it can rapidly become unwieldy as a patchwork quilt of different entry requirements builds up for other markets. Risk-Led The final zone is where actions are defined by the risk the business is exposed to. Being led by risk in this way should be natural and intuitive. Most of us might secure our garden shed with a simple padlock but would have several more secure locks on the doors to our house. We would probably also have locks on the windows and may add CCTV cameras and a burglar alarm if we were sufficiently concerned about the threats in our area. We may even install a secure safe inside the house if we have some particularly valuable possessions. These decisions and the application of defences are all informed by our understanding of the risks to which different groups of assets are exposed. The security decisions you make at home are relatively trivial compared to the complexity most businesses face with digital risk. Over the decades, technology infrastructures have grown, often becoming a sprawling landscape where the boundaries between one system and another are hard to determine. In the face of this complexity, many organisations talk about being risk-led but, in reality, operate in one of the other zones. There is no reason why an organisation can’t progressively transform from an Ad Hoc, Regulatory-Led or Opportunity-Led posture into a Risk-Led one. This transformation may need to include a strategy to enhance segmentation and reduce the sprawling landscape described above. Risk-Led also doesn’t mean applying decentralised, bespoke controls on a system-by-system basis. The risk may be assessed against the asset or a category of assets, but most organisations usually have a framework of standard controls and policies to apply or choose from. The test to tell whether an organisation genuinely operates in the Risk-Led zone is whether they have a well-defined Risk Appetite. This policy is more than just the one-liner stating that they have a very low appetite for risk. It should typically be broken down into different categories of risk or asset types; for instance, it might detail the different appetites for personal data risk compared to corporate intellectual property marked as 'In Strict Confidence'. Each category should clarify the tolerance, the circumstances under which risk will be accepted, and who is authorised to sign off. I’ve seen some exceptionally well-drafted risk appetite policies that provide clear direction. Once in place, any risk review can easily understand the boundaries within which they can operate and determine whether the controls for a particular context are adequate. I’ve also seen many that are so loose as to be unactionable or, on as many occasions, have not been able to find a risk appetite defined at all. In these situations, there is no clear way of determining 'How much security is enough'. Organisations operating in this zone will frequently still have to meet regulatory requirements and individual customer or market expectations. However, this regulatory or commercial risk assessment can take the existing strategy as the starting point and review the relevant controls for compliance. That may prompt an adjustment to security in certain places. But when challenged, you can defend your strategy because you can trace decisions back to the negative outcomes you are attempting to prevent — and this intent is in everyone’s common interest. Conclusions Which zone does your business occupy? It may exist in more than one — for instance, mainly aiming for a specific security maturity in the Ad Hoc zone but reinforced for a particular customer. But which is the dominant zone that drives plans and behaviour? And why is that? It may be the right place for today, but is it the best approach for the future? Apart from the 'Bucket of Sand' approach, each has pros and cons. I’ve sought to stay balanced in how I’ve described them. However, the most sustainable approach is one driven by business risk, with controls that mitigate those risks to a defined appetite. Regulatory compliance will probably constitute some of those risks, and when controls are reviewed against the regulatory requirements, there may be a need to reinforce them. Also, some customers may have specific standards to meet in a particular context. However, the starting point will be the security you believe the business needs and can justify before reviewing it through a regulatory or market lens. If you want to discuss how you can improve your security, reduce your digital risk, and face the future with confidence, get in touch with Tom Burton, Senior Partner - Cyber Security, using the below form.
AI co-pilot
by Jason Jennings 28 July 2025
Jason Jennings | Elevate your project management with AI. This guide for senior leaders explains how AI tools can enhance project performance through predictive foresight, cognitive collaboration, and portfolio intelligence. Unlock the potential of AI in your organisation and avoid the common pitfalls.
St Pauls Cathedral
by Craig Cheney 24 July 2025
Craig Cheney | The UK Government has taken a major step forward in reshaping local governance in England with the publication of the English Devolution and Community Empowerment Bill. This is more than a policy shift — it’s a structural rethink that sets out to make devolution the norm, not the exception.
by Faye Holland 11 July 2025
Today, we are proud to be spotlighting Faye Holland, who became Managing Partner at Cambridge Management Consulting for Client PR & Marketing as well as for our presence in the city of Cambridge and the East of England at the start of this year, following our acquisition of her award-winning PR firm, cofinitive. Faye is a prominent entrepreneur and a dynamic force within the city of Cambridge’s renowned technology sector. Known for her ability to influence, inspire, and connect on multiple fronts, Faye plays a vital role in bolstering Cambridge’s global reputation as the UK’s hub for technology, innovation, and science. With over three decades of experience spanning diverse business ventures, including the UK’s first ISP, working in emerging business practices within IBM, leading European and Asia-Pacific operations for a global tech media company, and founding her own business, Faye brings unparalleled expertise to every endeavour. Faye’s value in the industry is further underscored by her extensive network of influential contacts. As the founder of cofinitive, an award-winning PR and communications agency focused on supporting cutting-edge start-ups and scale-ups in tech and innovation, Faye has earned a reputation as one of the UK’s foremost marketing strategists. Over the course of a decade, she built cofinitive into a recognised leader in the communications industry. The firm has since been featured in PR Weekly’s 150 Top Agencies outside London, and has been named year-on-year as the No. 1 PR & Communications agency in East Anglia. cofinitive is also acknowledged as one of the 130 most influential businesses in Cambridge, celebrated for its distinctive, edge, yet polished approach to storytelling for groundbreaking companies, and for its support of the broader ecosystem. Additionally, Faye is widely recognised across the East of England for her leadership in initiatives such as the #21toWatch Technology Innovation Awards, which celebrates innovation and entrepreneurship, and as the co-host of the Cambridge Tech Podcast. Individually, Faye has earned numerous accolades. She is listed among the 25 most influential people in Cambridge, and serves as Chair of the Cambridgeshire Chambers of Commerce. Her advocacy for women in technology has seen her regularly featured in Computer Weekly’s Women in Tech lists, and recognised as one of the most influential women in UK tech during London Tech Week 2024 via the #InspiringFifty listing. Faye is also a dedicated mentor for aspiring technology entrepreneurs, having contributed to leading entrepreneurial programs in Cambridge and internationally, further solidifying her role as a driving force for innovation and growth in the tech ecosystem. If you would like to discuss future opportunities with Faye, you can reach out to her here .
More posts