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Tags: Laser, communication, systems, Laser communication, laser communication device, mars laser communication demonstration, laser communication distance, laser communication detectors, lunar laser communication demonstration, designing a laser communication device, laser communication devices, laser communication equipment, laser communication experiment, laser communication engineer, cordless desktop lx715 laser communication edition, logitech cordless desktop lx715 laser communication edition, laser communication advantages,
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17-01-2010, 09:34 PM
Post: #1
Laser communication systems
plzzzzzzzzz post the technical seminar topic.....plzzzz
17-01-2010, 10:26 PM
Post: #2
RE: Laser communication systems
Laser communications systems are wireless connections through the atmosphere. Laser communications systems work similarly to fiber optic links, except the beam is transmitted through free space. While the transmitter and receiver must require line-of-sight conditions, Laser communications systems have the benefit of eliminating the need for broadcast rights and buried cables. Laser communications systems can be easily deployed since they are inexpensive, small, low power and do not require any radio interference studies. The carrier used for the transmission signal is typically generated by a laser diode. Two parallel beams are needed, one for transmission and one for reception.

Laser communications will be a hot topic , as a solutions for how to satisfy ever increasing bandwidth needs are in high demand. in Laser communications systems bandwidth could be distributed in neighborhoods by putting laser communication systems on top of homes and pointing them towards a common transceiver with a fast link to the Internet. With possible transmit speeds of up to a gigabit per second, Other applications for Laser communications systems technology include temporary connectivity needs (e.g. sporting events, disaster scenes, or conventions), or space based communications.




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http://instruct1.cit.cornell.edu/courses..._level.htm
http://server4.oersted.dtu.dk/courses/31...ject11.pdf
http://spie.org/etop/2007/etop07k12IX.pdf

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31-01-2010, 08:18 PM
Post: #3
RE: Laser communication systems
please read http://www.seminarprojects.com/Thread-LA...munication for full seminar report of Laser communications systems

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02-11-2010, 12:35 PM
Post: #4
RE: Laser communication systems

.pdf  37755706-Laser-Communication.pdf (Size: 210.61 KB / Downloads: 522)
LASER Communication .


1.INTRODUCTION



Lasers have been considered for space communications since their realization in 1960.
Specific advancements were needed in component performance and system engineering
particularly for 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 viable but also an attractive approach into inter
satellite link applications.
Information transfer is driving the requirements to higher data rates, laser cross -link
technology explosions, global development activity, increased hardware, and design
maturity. Most important in space laser communications has been the development of a
reliable, high power, single mode laser diode as a directly modulable laser source. This
technology advance offers the space laser communication system designer the flexibility
to design very lightweight, high bandwidth, low-cost communication payloads for
satellites whose launch costs are a very strong function of launch weigh. This feature
substantially reduces blockage of fields of view of most desirable areas on satellites. The
smaller antennas 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.
19-12-2010, 09:05 PM
Post: #5
RE: Laser communication systems
ABSTRACT



Laser communication systems hold great promise for broadband applications. This technology uses much higher-than-RF region of the spectrum and allows concentration of the signal within a very small spatial angle, thus offering unsurpassed throughput, information security, reduced weight and size of the components and power savings.
Unfortunately, these intrinsic advantages do not come without a price: small beam divergence requires precise positioning, which becomes very critical at high bit rates. Complex motion patterns of the communicating platforms, resident vibrations, and atmospheric effects are known to cause significant signal losses through the mechanisms of the pointing errors, beam wander and other higher-order effects. Mitigation of those effects is achieved through the multiple means of fast tracking and wavefront control. In this paper we focus on the application of a beam steering technology and its effect on the communication performance of the system. We present the results of an experimental study of a laser communication link subjected to pointing distortions. These distortions are generated by a special disturbance element in the optical setup, which recreates specific operation environments with particular spectral characteristics. The acousto-optic technology is used to build an agile tracking system to assure the maximum signal reception in spite of the harsh operational conditions. The received communication signal is recorded and statistically analyzed to calculate the bit-error-rates. This paper presents the synthesis of a tracking system and the experimental results characterizing the communication performance under uncompensated pointing disturbance and with tracking.


.docx  Laser Communications.docx (Size: 23.49 KB / Downloads: 242)

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