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The newly released Hyper-Rail photonics system boosts fiber density in amplification huts, giving data centers room to scale

In sum — what to know

Capacity crunch: Existing amplifier huts with their legacy line systems are straining under the capacity surge of scale-across networks.

Hyper-rail for greater density: Ciena showcases RLS Hyper-Rail at OFC, a multi-rail photonics system that can accomodate up to 128 fiber pairs per rack, allowing hyperscalers to light up more fiber in less time and space.

Competition: Two other vendors — Nokia and Cisco — introduced similar multi-rail line systems at OFC.

Large cloud companies with expanding data center corridors are facing a capacity crunch. They need to light up hundreds of fiber pairs between data centers, and amplifier huts — the small concrete buildings scattered along fiber routes between data centers — are at capacity.

Ciena is addressing the issue with a recently-introduced multi-rail offering, dubbed RLS Hyper-Rail.

“The fundamental problem is that amplifier huts cannot accommodate the number of fiber pairs that hyperscalers need…with the given power that is required to support all of the traffic running over that fiber,” said Mark Bieberich, VP of portfolio marketing, Ciena, in an exclusive interview with RCR at the OFC Conference. 

According to data, in 2026, data centers will require 10 to 36 times more fiber to support the growing data volume and connectivity demands of AI compute clusters. The Fiber Broadband Association estimates that within the U.S. alone, hyperscalers will need to add 2x more fiber route miles, and 2.3x more fiber miles by 2029. 

Many of Ciena’s customers are considering scale-across architectures, a concept specifically designed to support AI-scale computing. In a scale-across architecture, workloads — especially AI model training and inference — are spread across multiple data centers interconnected by high-speed optical networks, as opposed to running them in a single facility. This opens access to large-scale compute power often not available in a single location. 

However, scale-across architectures rely on higher fiber density, which inline amplification huts were never designed to support.

“A new approach to building out the photonic layer, to use existing inline amplification huts and rethink how they’re designed, how they’re architected is needed,” Bieberich said.

One way to address the capacity growth is by increasing the density of line systems and that’s what a multi-rail architecture offers. These systems collapse the physical footprint of multiple fiber rails into a single line card, providing capacity to light multiple fiber pairs in parallel. This instantly boosts up capacity of existing huts without requiring new builds, while keeping power consumption in check and fiber utilization optimal. 

“What hyper-rail does is, it improves the overall density of supporting fiber running through the inline amplification huts by a large margin,” Bieberich noted. 

Specifically, RLS Hyper-Rail supports “32x the density of an existing line system.” That amounts to 128 fiber pairs per rack. The goal is to enable hyperscalers to light up more fiber in less time and space.

Ciena’s Hyper-Rail plays in environments where companies are pushing distances to hundreds of kilometers and more. “The idea there is that you can use a variety of different amplification techniques to accommodate the types of distances that our customers require,” Bieberich said.

Ciena claims its Hyper-Rail solution can deliver up to 75% more power and 85% more space savings compared to traditional line system. 

If a customer wants to try it out, there’s a way to do it at the pre-deployment stage. Ciena’s services organization offers a variety of solution validation and staging services to allow customers to test the hardware and ensure it performs as expected. 

“We find that our customers put a lot of emphasis on working with us in the solution validation stage to ensure that they have the full confidence to turn up new fiber, on these particular systems,” he said.

Ciena showcased RLS Hyper-Rail at OCF, where Nokia and Cisco also introduced their multi-rail optical line systems.

“Scale-across was a key focus at OFC 26, driven by the need to increase fiber density across data center clusters for large-scale pre-training,” noted Roy Chua, principal analyst at AvidThink.

As for how Ciena and Nokia’s solutions compare with each other, Chua said, “Ciena’s Hyper-Rail offers a pragmatic, easily deployable multi-rail photonics solution for AI-era DCI [data center interconnect], developed with their hyperscale customers. Meanwhile, Nokia’s multi-rail solution, pushing maximum theoretical density, is set for H2 2026, achieving 160 in-line amplifiers (ILAs) per rack compared to 128 from Ciena and Cisco.”

Read more on how Ciena is helping cloud and telco networks scale fiber capacity to meet the AI demand surge with a mix of advanced optics, multi-rail photonic systems, and software agents here.