Ever had your video call freeze right as you try to unmute? Researchers have demonstrated a chip-scale optical wireless transmitter that pushed data to 362.7 gigabits per second over a 6.6-foot free-space link, using light instead of radio.
The work was reported in the journal Advanced Photonics Nexus on March 11, 2026, and summarized in a March 30, 2026, news release from SPIE.
This is not a signal that home routers are about to vanish. But it is a strong hint that indoor connectivity may soon get a “pressure valve,” a light-based layer that can offload the hottest traffic in the places where radio waves get crowded.
If it pans out, the payoff could show up in everyday moments, fewer dropped calls, smoother streaming, and a little less power draw behind the scenes.
Why Wi‑Fi is struggling indoors
Why does Wi‑Fi slow down the second a meeting room fills up? Radio-based systems have to share limited spectrum, and dense indoor spaces can mean more interference and more energy use as devices pile on. SPIE points to rising demand from streaming, video calls, virtual reality, and smart devices as a key driver of today’s “wireless congestion.”
New standards help, but they do not change the basic tradeoff that one radio channel is shared. Wi‑Fi 6, for example, has a theoretical maximum of 9.6 gigabits per second across multiple channels, yet real-world speeds are typically much lower and spread across many users.
That mismatch between specs and lived experience is why researchers keep hunting for new options.
A 25‑laser transmitter built for parallel data
The new system leans on a custom 5-by-5 array of vertical-cavity surface-emitting lasers, or VCSELs, tiny semiconductor lasers that emit infrared light and are already common in data centers and sensing. In testing, 21 of the 25 lasers were operational, each carrying about 13 to 19 gigabits per second, for an aggregate 362.7 gigabits per second across a 6.6-foot link.
The laser array sits on a chip under 0.04 inches across, making it plausible for compact access points and, eventually, integration into some devices.
Instead of pushing one beam to its limit, the team pushed many beams in parallel using a modulation method that divides data into closely spaced frequency channels. They also noted the experiment was constrained by the bandwidth of a commercial photodetector, which suggests higher rates could be possible with faster receivers.
On energy, SPIE reports about 1.4 nanojoules per bit, roughly half of what state-of-the-art Wi‑Fi uses under comparable conditions, and that matters when power costs keep creeping into every IT budget.
Beam shaping and the multiuser test
Multiple light beams can create their own mess if they overlap, so the researchers used a custom microlens array and additional optics to steer light into a structured grid of square illumination spots.
At 6.6 feet, they measured more than 90% uniformity across the illuminated region, which helps keep signals separated. That same approach makes it easier to aim capacity where it is needed, desk by desk.
In a multiuser demo with four active beams, each link stayed stable and delivered a combined data rate of about 22 gigabits per second. It is not the peak headline number, but it is the more realistic story, several simultaneous links in one room without heavy interference.
In practical terms, it is like giving devices “light lanes” instead of forcing everyone onto the same radio highway.
What has to happen before light links go mainstream
Light-based wireless comes with a weakness anyone can guess – it needs a clearer path than radio. Research on Li‑Fi security notes that light can be contained within a physical space and does not pass through walls, but that also means people and objects can block the link, and light that escapes through openings can still pose risks.
A fast lab link is one thing, a busy office with people moving around is another.
That is why SPIE frames optical wireless as a complement, not a replacement, for Wi‑Fi and mobile networks. The idea is to offload traffic in high-capacity rooms, with future systems potentially integrated into lighting fixtures, ceilings, or access points. Done well, it is the kind of upgrade users might barely notice, except that things just work more often.
The standards world is moving, too
The standards world is moving, too. IEEE 802.11bb, published in 2023, defines how Wi‑Fi-style networking can operate over light in the 800 to 1000 nanometer band, with throughput ranging from 10 megabits per second to 9.6 gigabits per second.
The gap between that range and a 362.7-gigabit-per-second demo shows both the promise and the distance to mass-market interoperability.
Business and defense implications
For business, the near-term question is where directional, ultrafast indoor links deliver clear return on investment. SPIE highlights offices, homes, data centers, hospitals, and public venues as likely targets, because those are the places where crowding is most obvious and every extra watt adds up.
VCSEL arrays can be made with standard semiconductor processes, which is one of the few details that hints at scalability beyond a single lab bench.
For defense and critical infrastructure, the appeal is control. Research comparing Wi‑Fi and Li‑Fi argues light-based links are “more secure” in the basic sense that the signal can be contained within a room and does not pass through walls, and SPIE emphasizes that optical wireless does not interfere with existing radio systems.
But line-of-sight limits also create fragility, so hybrid networks that blend light and radio are still the most plausible end state.
At the end of the day, the real story is not “Wi‑Fi is dead,” but that indoor networks may soon have a new tool for the busiest rooms.
The press release was published on EurekAlert!.
