19-02-2013, 10:21 AM
PPT On Free Space Optical Communication
[attachment=51280]
Every thing was destroyed including normal fiber link
Wall street stock market was closed because the communication was destroyed
Two of these units were used between building to re-establish a high speed communication link.
FSO communication between Merrill Lynch Brokerage and Wall Street in New York following the terrorist attack that destroyed normal fiber optic link
Challenge 01—Hitting the target
Getting a laser beam to hit the mark in a laboratory setting is easy, but in the real world it is much harder.
1)Atmospheric turbulence
2)Fog
3)Building movement
Solution
Active beam steering (sometimes involving MEMS),
Multiple laser beams,
Automated power control, and calculated laser beam divergence. Pulsed laser beams start out just centimeters wide and can diverge to 1 meter or more over typical link distances—like using a really big bullet to hit a small target.
Companies And Rapidly Advancing FSO Technology
AirFiber's products combine FSO with 60 GHz millimeter-wave radio, makes wireless communication possible in any weather.
LightPointe
LightPointe's FSO products utilize a multi-beam sending process, which overcomes atmospheric degradations and temporary beam obstructions by overlapping redundant infrared beams.
Advantage FSO Over RF
RF 2.4 GHz systems were typically running at 2-4 Mbps due to interference issues in the unlicensed frequency ranges
The lasers used are eye safe, so even a butterfly can fly unscathed through a beam
Conlusion
FSO is just starting to be applied to solve the Internet “last-mile” interconnectivity problem. Some believe that it may be the unlimited bandwidth solution for the metro urban core of downtown building-to-building communication, as well as the optimal technology for home-to-home and office-to-office connectivity.
[attachment=51280]
Every thing was destroyed including normal fiber link
Wall street stock market was closed because the communication was destroyed
Two of these units were used between building to re-establish a high speed communication link.
FSO communication between Merrill Lynch Brokerage and Wall Street in New York following the terrorist attack that destroyed normal fiber optic link
Challenge 01—Hitting the target
Getting a laser beam to hit the mark in a laboratory setting is easy, but in the real world it is much harder.
1)Atmospheric turbulence
2)Fog
3)Building movement
Solution
Active beam steering (sometimes involving MEMS),
Multiple laser beams,
Automated power control, and calculated laser beam divergence. Pulsed laser beams start out just centimeters wide and can diverge to 1 meter or more over typical link distances—like using a really big bullet to hit a small target.
Companies And Rapidly Advancing FSO Technology
AirFiber's products combine FSO with 60 GHz millimeter-wave radio, makes wireless communication possible in any weather.
LightPointe
LightPointe's FSO products utilize a multi-beam sending process, which overcomes atmospheric degradations and temporary beam obstructions by overlapping redundant infrared beams.
Advantage FSO Over RF
RF 2.4 GHz systems were typically running at 2-4 Mbps due to interference issues in the unlicensed frequency ranges
The lasers used are eye safe, so even a butterfly can fly unscathed through a beam
Conlusion
FSO is just starting to be applied to solve the Internet “last-mile” interconnectivity problem. Some believe that it may be the unlimited bandwidth solution for the metro urban core of downtown building-to-building communication, as well as the optimal technology for home-to-home and office-to-office connectivity.