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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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ike 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. However, to generate the communications traffic and revenue needed to fully utilize and pay for these backbone upgrades, higher bandwidth connections must reach the end customers. This requires substantial bandwidth upgrades at the network edge. Essentially, to full..................[:=> 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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s and can range in size from micrometers to millimeters. These systems can sense, control and actuate on the micro scale, and function individually or in arrays to generate effects on the macro scale. MEMS is an enabling technology and current applications include accelerometers, pressure, chemical and flow sensors, micro-optics, optical scanners, and fluid pumps. Generally a satellite consists of battery, internal state sensors, communication systems and control units. All these can be made of MEMS so that size and cost can be considerably reduced. Also small satellites can be constructed by ..................[:=> 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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shaping, and telescope optics. The receiver beam comes in through the optical system and is passed along to detectors and signal processing electronics. There are also terminal control electronics that must control the gimbals and other steering mechanisms, and servos, to keep the acquisition and tracking system operating in the designed modes of operation.

Operation
Free space laser communications systems are wireless connections through the atmosphere. They work similar to fiber optic cable systems except the beam is transmitted through open space. The carrier used for the transmission o..................[:=> 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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osphere)
_ Moving building (although we are not aware of the movement, buildings often sway from side to side even settle into the ground causing offset to the laser beam and making the receiver laser receive less power)

Applications

Free space applications
Due to its properties optical free space 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 comm..................[:=> 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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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 out again. (The exact details of its workings are unknown, pending patent applications.) It works as a kind of floating touch screen, making it possible to manipulate ..................[:=> 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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ical data transfer from interplanetary spacecraft. Space laser communication is beginning to be accepted as a viable and reliable means of transferring data between satellites. Presently, ongoing hardware development efforts include ESA's Space satellite Link Experiment (SILEX) and the Japanese's Laser Communication Experiment (LCE). The United States development programs ended with the termination of both the production of the laser cross-link subsystem and the FEWS satellite program
.
Satellite use from space must be regulated and shared on a worldwide basis. For this reason, frequencies t..................[:=> 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
Communications , Laser, Space , Free, seminar topics on free space laser communication , free space laser communications seminar ppt free download, laser communications seminar ppt free download , space electricity, secure based laser communication , seminar on free space laser communication,
he weight 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 termi..................[:=> 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,
terahertz (THz) spectrum range. Air, ot fiber, is the transport medium. This means that urban businesses needing fast data and Internet access have a significantly lower-cost option.








FSO
FSO technology is implemented using a laser device .These laser devices or terminals can be mounted on rooftops ,Corners of buidings or even inside offices behind windows. FSOdevices look like security video cameras.

Low-power infrared beams, which do not harm the eyes, are the means by which free-space optics technology transmits data through the air between transceivers, or link heads..................[:=> Show Contents <=:]



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