On June 3, 1880, Alexander Graham Bell's assistant made a phone call with a sunbeam.

He climbed onto the roof of a Washington school and spoke into a mirror.

The mirror shook with his voice. The sunlight bouncing off it flickered in step with his words. Seven hundred feet away, a receiver caught the flicker and turned it back into sound.

Bell called it his greatest invention, greater than the telephone. He wanted to name his second daughter Photophone. His wife talked him out of it.

Then a cloud passed. No sun, no call. Copper worked in any weather.

Inside the machines, copper kept winning for 146 years.

Bell was early. But he was also right.

And something—maybe you’ve heard of it—is changing the entire architecture: artificial intelligence.

For years, using light to carry messages inside a computer was a lab trick. AI changed that. 

This fall, it hit the loading dock. And last Thursday, a rocket fired the starting gun on its next act.

Which means right now is the time to start paying close attention. 

AI's Clogged Artery

Let's start with the basics.

No single chip can train an AI. The job gets split across thousands of them, and they have to swap notes constantly.

Picture 10,000 cooks making one meal, passing ingredients down the line. The cooking is fast. The passing is the problem.

Copper does the passing.

For a century and a half, it was fast enough. 

AI broke that.

Push copper harder and the signal smears, like shouting down a long hallway. Cleaning it up takes power and throws off heat. Datacenters are already fighting over power plants.

So engineers went back to Bell's idea.

Revenge of the Sunbeam

A laser turns the chip's electrical signal into flashes of light, billions per second. A detector at the far end turns the flashes back.

Light travels clean, runs cool and goes the distance. The closer you put that laser to the chip, the less copper you need.

This summer, it left the lab.

In August, Nvidia's light-based network switch went into full mass production.

The first units went to CoreWeave, Lambda and Oracle. Coherent expects revenue from its version to start ramping in Q4.

The idea Bell patented in 1880 now ships with an invoice.

Here's the part nobody's connecting.

Screw the Clouds 

Bell had the light. He had the beam. The weather beat him.

Now the billionaires are going around the weather.

On October 1, a SpaceX rocket carried a small Google satellite into orbit. Inside were four of Google's AI chips. The project is called Suncatcher.

Of course, Google isn't alone. 

Musk's SpaceX has asked regulators for permission to launch up to a million AI satellites. Bezos's Blue Origin wants an oddly-specific 51,600. A startup called Starcloud has already flown an Nvidia chip into orbit.

They're all chasing the same thing: endless sunshine for power, and lasers to pass notes between satellites.

Copper can't cross empty space. Radio can't carry enough. So the plans run on light. 

Is it early? Very. But that's the point.

Nvidia is shipping light. Google has chips in orbit. Musk and Bezos have filed their paperwork. The biggest laser maker says it's sold out through 2027.

The starting gun just went off. The crowd shows up when the satellites start talking.

Bell aimed a mirror at the sun and talked. Now the billionaires are aiming lasers past the clouds.

Same idea. Better altitude.

Put your chair out early.