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Free Space Optics (FSO) : Technology History Market Challenges Advantages
Tags: network, optics, wireless on 2007-08-21 -All Annotations (0) -About
more fromwww.free-space-optics.org
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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, -
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, -
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 -
copper wire, wireless Internet access, broadband RF/microwave, coaxial
cable and direct optical fiber connections (fiber to the building;
fiber to the home). -
1.5 Mbps
(T-1) or 2.024 Mbps (E-1). -
Cable
modem -
Wireless
Internet access is still slow -
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 -
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 -
- 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.
- Free Space Optics (FSO) laser transmissions are optical and travel along a line
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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; -
at
1550 nm -
optical
filter -
optical
filter -
filters
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interference
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