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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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perate at higher power than 850 nm, by about two orders of magnitude. That power can boost link lengths by a factor of at least five while maintaining adequate strength for proper link operation. So for high data rates, long distances, poor propagation conditions (like fog), or combinations of those conditions, 1550 nm can become quite attractive.
Why FSO Now
Substantial investments by carriers to augment the capacity of their core fiber backbones have facilitated dramatic improvements in both price and performance, and they have also increased the capacity of these large backbone networks. ..................[:=> 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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nstructed by stacking wafers covered with MEMS and electronics components. These satellites are called I Kg. TECHNOLOGY Although MEMS devices are extremely small MEMS technology is not about size. Instead, MEMS is a manufacturing technology; a new way of making complex electromechanical systems using batch fabrication techniques similar to the way integrated circuits are made and making these electromechanical elements along with electronics. Material used The material used for manufacturing MEMS is Silicon. Silicon possesses excellent materials properties making it an attractive choice for ma..................[:=> 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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, this 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 contin..................[:=> 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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ses are required
_ Bandwidth is equal or superior to fibre systems and much better than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well some limitations:
_ Absorption (caused primarily by the water vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and the number and size of scattering elements in the air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and..................[:=> 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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ram, 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 create an acceptable screen.Heliodisplay moves through a dozen metal plates and then comes ou..................[:=> 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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ver 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 of space laser communication to NASA's tracking and data relay network both as cross-link and for user relay links. NASA's Jet Propulsion Laboratory is studyi..................[:=> 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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r space-qualified hardware. Advances in system architecture, data formatting, and component technology over the past three decades have made laser communications in space not only a viable but also a attractive approach to intersatellite link applications. The high data rate and large information throughput available with laser communications are many times greater than in radio frequency (RF) systems.

The small antenna size requires only a small increase in the weight and volume of host vehicle. In addition, this feature substantially reduces blockage of fields of view of the most desirab..................[:=> 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
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e reaping the benefits.

The use of free space optics is particularly interesting when we perceive that the majority of customers does not possess access to fibers as well as fiber installation is expensive and demands long time. Moreover, right-of-way costs, difficulties in obataining government licenses for new fiber installation etc. are further problems that has turned FSO into the option of choice for short reach applications.
FSO uses lasers, or light pulses, to send packetized data in the terahertz (THz) spectrum range. Air, ot fiber, is the transport medium. This means that urban b..................[:=> Show Contents <=:]



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