Re: Laser Communication in 2 to 10km range

Ramya Desai wrote:
Dear Carter,

Thanks for kind help.
Can I get any ready made components like antenna, high power Laser
components, to build this communication system.

With a bit of web searching you should be able to find complete optical communication system with ethernet or digital telephony interfaces with the development already completed. Designing a single reliable system will be very expensive. Laser systems at that dist stance will be "fair weather only" as they are poor at penetrating rain, clouds, fog, or snow. If the path is close to the ground atmospheric refraction many require active angular adjustment of the transmit beam.

Is there some good reason not to use microwave in the 2 to 6 ghz range? The equipment for the 2.4 and 5.6 ghz bands is dirt cheap (by comparison to optical with active tracking) for bandwidths up to 100Mbps and it will penetrate precipitation quite well if you have a 1000:1 excess signal. (30 db fade margin). Microwaves in the 8 to 40 ghz regions are available too but will be increasingly affected by rain at the higher frequencies. Microwave systems aren't nearly as difficult to keep in alignment as optical systems.

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