[foobiekr]

Any free space optical approach you can imagine will be slower and noisier than the equivalent technology in a fiber. You are not going to get DWDM channel density in free space or throughput.

This is not real.

[mlyle]

> Any free space optical approach you can imagine will be slower and noisier than the equivalent technology in a fiber.

Granted. More path loss, dispersion, potential for interference. The question is how well can you do?

> This is not real.

I believe ETHZ; of course there's more to do to make a practical system.