This link has been bookmarked by 2 people . It was first bookmarked on 20 Aug 2007, by wawilson.
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15 Sep 08
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20 Aug 07
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Free Space Optics (FSO) works on the same basic principle as Infrared
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in the teraHertz spectrum
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Commercially available systems offer capacities in the range of 100 Mbps to 2.5 Gbps,
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Free Space Optics (FSO) systems can function over distances of several kilometers. As long as there is a clear line of sight between the source and the destination, and enough transmitter power,
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no spectrum licensing
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secure
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simplifying wiring and cabling
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only essential requirement
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line of sight between the two ends of the link
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copper wire, wireless Internet access, broadband RF/microwave, coaxial cable and direct optical fiber connections (fiber to the building; fiber to the home).
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1.5 Mbps (T-1) or 2.024 Mbps (E-1).
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Cable modem
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Wireless Internet access is still slow
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security and capacity problems
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Broadband RF/microwave systems
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scarce and expensive licensed commodity,
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channels are insecure and subject to interference
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virtually unlimited bandwidth, low cost, ease and speed of deployment
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more secure
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Free Space Optics (FSO) laser beams cannot be detected with spectrum analyzers or RF meters
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- Free Space Optics (FSO) laser transmissions are optical and travel along a line of sight path that cannot be intercepted easily. It requires a matching Free Space Optics (FSO) transceiver carefully aligned to complete the transmission. Interception is very difficult and extremely unlikely
- The laser beams generated by Free Space Optics (FSO) systems are narrow and invisible, making them harder to find and even harder to intercept and crack
- Data can be transmitted over an encrypted connection adding to the degree of security available in Free Space Optics (FSO) network transmissions.
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it must contend
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the atmosphere.
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Fog
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is adversely affected by scintillation on bright sunny days;
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at 1550 nm
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optical filter
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optical filter
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filters
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interference
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