free space optics....
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From: steveu on 9 Aug 2010 04:19 >Eric Jacobsen <eric.jacobsen(a)ieee.org> wrote: > >>Yes, the main advantage to free-space optics is the potential for >>higher bandwidth (and higher throughput) than is possible with RF >>transmission, as well as higher immunity from interference. > >A huge advantage is low probability of intercept. > >Interference can happen though... if your two platforms and the sun >are collinear. > >Steve Interference with free space laser communications is mostly smoke and mirrors. :-) Steve
From: fisico32 on 9 Aug 2010 09:06 >ok, but if we could solve the weather problems, would we gain that much more bandwidth? People talk about WiMax....can lasers do that much better? Any example of how much better? thanks! >"fisico32" <marcoscipioni1(a)n_o_s_p_a_m.gmail.com> wrote in message >news:POWdnanAxdmu98LRnZ2dnUVZ_oSdnZ2d(a)giganews.com... >> Hello Forum, >> >> I friend of mine company was using free space laser links to connect >> building to building. Now they use radio waves. The radio antenna are >> pretty small. >> >> Is there a real advantage in using laser (optical frequencies) instead of >> radio frequencies? >> >> Can we achieve faster modulations with lasers than RF and a much larger >> data rate? >> >> Laser are used in fibers in wavelength division multiplexing: the same as >> frequency division multiplexing, we can cram more channels each one with a >> large bandwidth) together without having them interfere.... >> >> But in the case of a single channel (link bldg to bldg) can lasers achieve >> super bandwidths? >> thanks >> fisico32 > >I'd expect you to have more transparency problems with lasers. > >Lasers can theoretically achieve higher bandwidths, but you may >have problems with the bandwidths of the components used to >translate from electrical signals to light and back. > >Robert Miles > > >
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