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freespace optics full report


Posted by: computer science technology
Created at: Sunday 24th of January 2010 10:58:39 AM
Last Edited Or Replied at :Friday 24th of February 2012 11:24:11 PM
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an affect an FSO system's capacity. FSO is also a line-of-sight technology and interconnecting points must be free from physical obstruction and able to see each other.
1:- Scintillation
Scintillation is best defined as the temporal and spatial variations in light intensity caused by atmospheric turbulence. Such turbulence is caused by wind and temperature gradients that create pockets of air with rapidly varying densities and therefore fast changing indices of optical refraction. These air pockets act like prisms and lenses with time varying properties. Their action is readily observed in..................[:=> Show Contents <=:]



MEMS in space


Posted by: computer science crazy
Created at: Monday 23rd of February 2009 12:49:15 PM
Last Edited Or Replied at :Friday 14th of January 2011 09:02:58 AM
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o for silicon is higher th..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Monday 22nd of September 2008 12:11:49 AM
Last Edited Or Replied at :Tuesday 05th of February 2013 12:32:14 PM
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and volume of host vehicle. In addition, this feature substantially reduces blockage of fields of view of the most desirable areas on satellites. The smaller antennas, with diameters typically less than 30cm, create less momentum disturbance to any sensitive satellite sensors. Fewer onboard consumables are required over the long lifetime because there is less disturbance to the satellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

Features Of Laser Communications System
A block diagram of typical terminal is il..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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ace communications is suited very well for providing high bandwidth to point-to-point connections. The attenuation characteristics of free space make inter-satellite connections a promising application for optical free space communication. Systems of this kind are already being deployed as a communications media in a number of key applications around the world.

Terrestrial applications
For terrestrial applications emerged a solution to the .last mile problem.. This consists in the fact that needs for bandwidth cannot be satisfied because the next fibre backbone is too far away. Laser links..................[:=> Show Contents <=:]



Heliodisplay


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:58:35 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 11:56:46 PM
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play is an interactive planar display. Though the image it projects appears much like a hologram, its inventors claim that it doesn't use holographic technology, though it does use rear projection (not lasers as originally reported) to project its image. It does not require any screen or substrate other than air to project its image, but it does eject a water-based vapour curtain for the image to be projected upon. The curtain is produced using similar ultrasonic technology as used in foggers and comprises a number of columns of fog. This curtain is sandwiched between curtains of clean air to ..................[:=> Show Contents <=:]



Laser Communication Systems


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:40:09 AM
Last Edited Or Replied at :Friday 02nd of April 2010 11:54:08 PM
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with diameter typically less than 30 centimeters create less momentum disturbance to any sensitive satellite sensors. Fewer on board consumables are required over the long lifetime because there are fewer disturbances to the satellite compared with heavier and larger RF systems. The narrow beam divergence affords interference free and secure operation.



Background
Until recently, the United States government was funding the development of an operational space laser cross-link system employing solid-state laser technology. The NASA is developing technology and studying the applicability..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:13:29 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:13:29 AM
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his ideal method requires a significant amount of laser power.

It is possible to operate a number of laser types at high peak power and low duty cycle to make acquisition easier. This is because a lower pulse rate is needed for acquisition than for tracking and communications. High peak power pulses more easily overcome the receiver set threshold and keep the false alarm rate low. A low duty cycle transmitter gives high peak power, yet requires less average power, and is thus a suitable source for acquisition. As the uncertainty area becomes less, it becomes more feasible to use a continues..................[:=> Show Contents <=:]



Free Space Optics


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:03:26 AM
Last Edited Or Replied at :Friday 24th of February 2012 11:24:18 PM
Optics , Space, Free , free space optics,
for military applications. At the end of 80's, it appeared as a commercial option but technological restrictions prevented it from success. Low reach transmission, low capacity, severe alignment problems as well as vulnerability to weather interferences were the major drawbacks at that time. The optical communication without wire, however, evolved! Today, FSO systems guarantee 2.5 Gb/s taxes with carrier class availability. Metropolitan, access and LAN networks are reaping the benefits.

The use of free space optics is particularly interesting when we perceive that the majority of customer..................[:=> Show Contents <=:]



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