Chinese researchers have reportedly developed a new “three-lane highway” optical fiber system. The new system, the researchers explain, could dramatically expand the data-transfer capacity of future networks, notably those for artificial intelligence (AI).

Put in simpler terms, the innovation effectively “squeezes” more traffic from fiber-optic cables without having to replace or lay new cabling. According to the team, they have been able to increase traffic by as much as five times while also increasing transmission capacity per core by nearly 50%.

Today, most internet traffic travels through glass fibers using laser light. Importantly, each fiber doesn’t just carry one beam of light. It carries many wavelengths (colors) of light simultaneously, like multiple radio stations sharing the airwaves.

Presently, most commercial systems use a mixture of C-band (the workhorse) and L-band wavelengths. The latter is used to extend capacity when needed.

The team, they report, has managed to add a third, called S-band; hence the “three-lane highway” analogy. The fiber itself isn’t necessarily wider; they’re simply using more of the available light spectrum.

Adding an extra lane to optical fibers

So, you might ask, why hasn’t S-band been used before? Well, in short, over long distances, optical signals tend to weaken. To overcome this, telecom companies use optical amplifiers placed along the route.

The industry’s amplifiers were optimized for C-band (and later L-band). S-band signals were more difficult and expensive to amplify cleanly. To this end, the Chinese team claims to have solved enough of these engineering problems to make commercial deployment practical.

But there is another trick up the team’s sleeve: multiple cores to the fibers. Normal optical fibers consist of a single core, but the team’s new ones reportedly actually contain four.

To this end, each of these core acts like an independent fiber. So, unlike traditional fibers with a single core and two optical bands, the new fibers actually have four cores, with three optical bands working simultaneously.

That’s a significant leap in capability. For applications like AI, this could prove to be very useful indeed, especially when it comes to removing data-transfer bottlenecks.

At present, most large AI models tend to use thousands of graphics processing units (GPUs), constantly exchanging data at the speed of light. A modern AI cluster can move terabits per second between machines.

5x the data transfer

Often, the bottleneck is not the GPU but getting data from one GPU cluster to another. So, if you can move five times more data through the same fiber infrastructure, you necessarily get faster training, larger distributed models, and lower network congestion.

Looking at the bigger picture, this isn’t a breakthrough in terms of fiber optics; similar achievements have happened in Japan, Europe, and the US. What is different is that this appears to have been commercially deployed, not just developed in a lab.

According to reports, the new optic fibers have run over about 21.7 miles (35 km) of an existing telecoms network, combining the innovations mentioned. Looking ahead, the team suggests the new cables could be deployed internationally, perhaps even in submarine cables.

It could also play a major role in China’s “Eastern Data, Western Computing strategy,” which seeks to shift data-intensive workloads from densely populated eastern regions to resource-rich western provinces, according to the developers.

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Chinese military planners have reportedly devised a plan to target US carriers in places like Guam. The strategy, published in the Chinese journal Tactical Missile Technology, claims a combination of satellites, AI, and missiles could render carrier groups vulnerable, even at distances of over 1,620 nautical miles (3,000 km).

At present, both the People’s Liberation Army (PLA) and the United States Navy know that the former can threaten critical assets like aircraft carriers close to China. To reduce that threat, the US Navy has increasingly positioned key assets farther from China’s coastline, relying on bases such as Guam and adopting more dispersed operating patterns across the Pacific.

The Navy has also been dispersing deployed ships in the region to make them much harder to find, track, and potentially attack. Not keeping their eggs in one basket, as it were.

However, as the South China Morning Post (SCMP) reports, the PLA has been working on a potential plan to threaten such ships even at great distances. Led by associate professor Gao Tianyun from the College of International Studies at the National University of Defence Technology in Nanjing, the proposal is very interesting indeed.

Dangerous game of hide-and-seek

The study, titled “Research on the effectiveness of anti‑ship missile swarm operation under distributed confrontation,” basically describes an innovative “kill-chain” solution rather than a new wonder weapon.

The idea, in a nutshell, is to first find the group using a mixture of satellites, drones, radar aircraft, ships, submarines, signals intelligence, etc. Once done, the plan would rely on near-constant tracking for long-range missiles to be targeted and launched.

With that achieved, the paper suggests firing many missiles (a mix of hypersonics and “pre-strike firepower packages”) at the target, not one or two.

Once in flight, the plan would rely on the missiles cooperating by sharing target data, sorting real ships from decoys, assigning themselves to different targets, and attacking from different angles.

According to the researchers, such a coordinated attack could overwhelm layers of US naval defense, including Aegis-equipped destroyers, interceptor missiles, electronic warfare systems, decoys, and close-in weapon systems.

So, something of a coordinated, long-range missile swarm attack. The point is to make the US defence system run out of time, interceptors, radar capacity, or correct target choices.

Means and motive

Sounds reasonable on the surface, but the plan comes with one major caveat. That being said, this is just a plan right now, not proof that China can actually do it tomorrow.

Needless to say, hitting a moving carrier group at 1,620 nautical miles distant is not an easy task. Achieving it in reality would be brutally hard because the target moves, hides, jams, uses decoys, and fights back.

The hardest part is not the missile range; it is maintaining accurate targeting data across the whole chain. While effectively just a wargame made public, the release of this information is likely intended to send a warning to the US, rather than actually boast about its technological prowess.

In effect, they are saying that hiding and dispersing your ships won’t necessarily keep you safe. We (China) have the means to get them if we want to.

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