China Mobile boosts AI capacity with commercial three-band fibre

China Mobile and partners have activated what they describe as the world’s first commercial three-band optical fibre system in Qingdao. The 35km link combines S, C and L bands with four cores inside standard fibre, aiming to increase AI network capacity without laying new routes. The signal is that multi-band, multi-core fibre is moving from research settings towards operational telecom infrastructure.

• The 35km Qingdao link combines S, C and L bands with four cores

• It signals capacity upgrades for AI networks without laying new routes

The fact

China Mobile and partners including Hengtong Optic-Electric have activated what they describe as the world's first commercial three-band optical fibre system in Qingdao, Shandong. The 35km link connects major computing facilities and uses S, C and L transmission windows inside standard fibre, alongside four independent cores that allow parallel data paths. The project team says one fibre can carry more than five times conventional traffic, while capacity per core rises by nearly half. Comparable higher-capacity demonstrations in Japan, Europe and the US have largely remained in laboratory settings.

The Assessment

The project moves S+C+L multi-core transmission from laboratory demonstrations into commercial infrastructure. For AI networks and national data-routing programmes such as China's East Data, Western Computing strategy, the bottleneck is not only compute but bandwidth and latency between clusters. The signal for operators and infrastructure suppliers is that future capacity growth may come from extracting more throughput from existing fibre corridors rather than building new routes. It also gives Chinese optical vendors a stronger commercial reference case for international expansion.

What to Watch

Watch whether China Mobile extends the Qingdao system beyond a 35km test bed to intercity or interprovincial routes, whether multi-core fibre costs fall, and whether the technology appears in backbone or submarine cable upgrades.