Hollow-core fiber (HCF) replaces the glass core of conventional single-mode fiber (SMF) with an air-filled center. In practice HCF is built as a microstructured glass “jacket” surrounding a central air channel. Light is guided not by total internal reflection in glass but by photonic-bandgap or anti-resonant effects in the cladding. Figure 1 shows a common “revolver” anti-resonant design: a central air core with a ring of thin silica tubes. This leaves >99% of the optical mode in air, dramatically reducing interaction with glass. By contrast, an SMF has a solid Ge-doped silica core (∼9 μm diameter) within a lower-index glass cladding. Because the HCF core index (n≈1) is much lower than the cladding, special cladding structures are required to confine light.

An optical cross-connect (OXC) is a network device that switches high‐speed optical signals between fiber inputs and outputs without converting them to electronics. In essence, an OXC uses photonic switching fabric to route wavelength channels from any incoming fiber to any outgoing fiber, typically by demultiplexing each WDM signal into individual wavelengths, directing them through a switch matrix, and then re-multiplexing onto output fibers. Because the signals remain in the optical domain (“transparent” switching), OXCs preserve data‐rate and protocol transparency. Because the signals remain in the optical domain (“transparent” switching), OXCs preserve data‐rate and protocol transparency. This all‐optical routing is controlled electronically (often via an SDN controller) to dynamically allocate bandwidth and restore paths without manual patching.

The digital landscape is being reshaped by the insatiable demands of Artificial Intelligence (AI), cloud computing, and High-Performance Computing (HPC). These transformative technologies require an unprecedented level of high-density fiber connectivity, pushing the boundaries of network infrastructure. As an OEM/ODM fiber cable assembly and connectivity manufacturer, we see firsthand the immense growth in demand for these critical components. Looking ahead, it’s becoming increasingly clear that the ability to secure a robust and scalable supply chain will be a decisive factor for success.

Unlock Unprecedented Performance and Efficiency with MTP & MPO Connector Assemblies In today’s data-driven world, where speed, density, and reliability are paramount, traditional fiber optic cabling solutions can quickly become bottlenecks. Enter MTP and MPO connector assemblies – the advanced, high-performance solution designed to revolutionize your network infrastructure. Built for the Future of Parallel Optics: Both MTP and MPO connectors were engineered from the ground up to facilitate parallel optics, enabling the high-bandwidth requirements of modern data transmission. While they’ve long served

At this year’s OFC conference, discussions around optical interconnects in AI scenarios—particularly for scale-out and scale-up architectures—were exceptionally active. Dozens of related workshops and panel discussions took place (as shown in the image below). Interestingly, some experts presented the same slides in different sessions, repeating their points despite differing stances, which made for an engaging dynamic. Here’s a curated summary of key insights for your reference.

It has been a while since my last blog, as I was busy preparing for and attending OFC. Afterward, I needed time to digest all the valuable insights I gathered. To be honest, getting started on this blog was daunting—I wasn’t sure which topic to address first, given the wealth of fascinating discussions at OFC. Unlike previous years, the focus wasn’t primarily on broadband; instead, AI connectivity took center stage, along with its vast bandwidth and low latency requirements.

The rapid advancement of Artificial Intelligence (AI) and Machine Learning (ML) is fundamentally reshaping datacenter network architectures. Presentations at the OFC Summit on Optics for AI Datacenters highlighted a clear trajectory driven by the insatiable demand for data. Three interconnected themes emerged: the sheer scale of future connectivity needs, the ongoing shift from traditional pluggable optics to Co-Packaged Optics (CPO), and the longer-term evolution towards highly integrated Optical I/O (OIO).

Distributed sensing at the access level of the FTTx network could have several benefits, such as notification when digging is done to close to the fiber, when there is tampering with the fiber, structural health of the cable or sensing of geological events (flooding, earth slide, etc…).
However, the cost of full-on distributed sensing is not cost effective, but there are a few alternatives, these techniques leverage standard or specialized optical equipment and analysis of light propagating through the fiber to detect physical changes. They generally offer lower initial cost than dedicated DS systems but may have limitations in spatial resolution or the type of information they provide.  

Rodrigo Amezcua Correa, Relativity Networks, USA
Paolo Dainese, Corning, USA
Russell Ellis, Microsoft, United Kingdom
Kerrianne Harringtone, University of Bath, United Kingdom
Matěj Komanec, CTU, Prague, Czech Republic
Andrew Lord, BT, United Kingdom
Kazunori Mukasa, Furukawa, Japan
Mohammad Pasandi, Ciena, Canada
Pierluigi Poggiolini, Politecnico di Torino, Italy
Yingying Wang, Linfiber and Jinan University, China
YOFC
China Telecom
Sumitomo (Sato)

This report summarizes key insights and trends from several OFC conference sessions, highlighting major shifts in network architecture, optical technologies, and strategic opportunities driven primarily by the demands of AI and escalating bandwidth requirements.