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What are the advantages of Free Space Optics?

Since the medium of transmission is FREE, I think Free Space Optics (FSO) should be more advantageous compared to other wired solutions. More research should be focussed towards transmitting light through the space.

What are the advantages of Free space optics in comparison with optical fibers, and copper cables?

The major advantage of free space optics is that the medium is air. You don't need to manufacture the medium unlike the wired media like optical fiber copper wire. Hence the deployment cost in terms of the material cost would be lower.

Free space optics deployment does not ask for the right of way from personal or public property owners. Hence, project time could be shortened.