This article covers Vector Photonics’ field demonstrations of photonic-crystal surface-emitting lasers (PCSELs) transmitting HD-capable data through open air. The Scottish startup worked with the Fraunhofer Center for Applied Photonics in Glasgow to integrate indium phosphide and indium gallium arsenide phosphide PCSELs into a setup built from everyday electronics.
They ran real-world free-space optical links, sending data at 1,310 nm—the telecom O-band—over 300 meters across the Clyde River and 500 meters across a field. The system hit sustained 50 Mbps data rates, enough for HD video and well above the project’s 22 Mbps requirement.
The team validated PCSEL performance even as temperature, humidity, and atmospheric turbulence changed. Susumu Noda, who pioneered the first PCSELs, called the river link a meaningful milestone for moving this technology into the real world.
Sure, lab results still top field performance—Noda’s group has seen multi-gigabit speeds in perfect conditions. But these outdoor tests show PCSELs are edging closer to practical, high-bandwidth links.
Vector’s CEO Richard Taylor expects things to get better fast. The team’s next goals? 1 Gbps at 1 kilometer, then several Gbps over longer distances.
PCSELs’ brightness and simpler lens needs could help shrink the size, weight, and cost of data-center, telecom, and satellite free-space optical communications. Maybe it’s the start of a shift from lab demo to rugged, deployable high-bandwidth optical links.
From lab to field: PCSELs step into open-air links
At the core of all this is a photonic-crystal lattice that tightly controls light. These tiny, energy-efficient lasers emit bright, narrow beams.
This design cuts down on the complexity of free-space optics. That really matters for outdoor links, where turbulence and weather can mess with signals.
The Glasgow team used PCSELs made from indium phosphide and indium gallium arsenide phosphide. Off-the-shelf electronics tied it all together, showing a hardware stack that could actually work in the field.
The 1,310 nm wavelength sits in the telecom O-band. That’s a familiar spot for short-haul free-space links, since it keeps atmospheric absorption low and works with existing fiber networks.
Key performance and testing metrics
The system moved HD-capable data across two real-world scenarios: 300 m over a river and 500 m across an open field. It kept up a steady 50 Mbps, beating the 22 Mbps HD requirement.
Tests showed the hardware could handle changing temperature, humidity, and turbulence. Even with environmental challenges, the PCSELs kept the signal going.
- Distance: 300 m across a river; 500 m across an outdoor field
- Wavelength: 1,310 nm (O-band)
- Data rate: sustained ~50 Mbps in field tests
- Hardware: PCSELs built from indium phosphide and InGaAsP, driven by off-the-shelf electronics
- Environment: fluctuating temperature, humidity, and atmospheric turbulence
Implications for industry and the road ahead
Susumu Noda, who built the first PCSELs, called the river-link a milestone for bringing the technology out of the lab and into the real world. The lab has hit speeds up to 16 Gbps in some experiments.
Field rates are still modest by comparison. Still, they show stability in real-world conditions—honestly, that’s a huge step for scalable deployment.
Richard Taylor and the Vector team see a clear path: first, hit 1 Gbps at 1 kilometer. Next, push to multiple Gbps over a few kilometers and see what opens up.
High brightness and simpler lens requirements shrink system size, weight, and cost. That makes PCSEL-based free-space optical communications a lot more attractive for data centers, telecom, and satellite links.
These field demos hint at a future where PCSELs become standard for high-bandwidth optical links, even in tight or unpredictable environments.
Here is the source article for this story: Steel-Melting Semiconductor Laser Powers HD Data Links