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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

Free Space Optics (FSO) works on the same basic principle as Infrared
in the teraHertz spectrum
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
secure
simplifying wiring and cabling
only essential requirement
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
Broadband RF/microwave systems
scarce and expensive licensed commodity,
channels are
insecure and subject to interference
virtually unlimited bandwidth, low cost, ease and speed of deployment
more secure
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.
it must contend
the atmosphere.
Fog
is adversely affected
by scintillation on bright sunny days;
at
1550 nm
optical
filter
optical
filter
filters
interference