Free Space Optics

Mention optical communication and most people think of fiber optics. But light travels through air for a lot less money. So it is hardly a surprise that clever entrepreneurs and technologists are borrowing many of the devices and techniques developed for fiber-optic systems and applying them to what some call fiber-free optical communication. Although it only recently, and rather suddenly, sprang into public awareness, free-space optics is not a new idea. It has roots that go back ....etc

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Free Space Optics

Mention optical communication and most people think of fiber optics. But light travels through air for a lot less money. So it is hardly a surprise that clever entrepreneurs and technologists are borrowing many of the devices and techniques developed for fiber-optic systems and applying them to what some call fiber-free optical communication. Although it only recently, and rather suddenly, sprang into public awareness, free-space optics is not a new idea. It has roots that go back ....etc

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Atop each of the Trump towers in New York City, there's a new type of wireless transmitter and receiver that can send and receive data at rates of more than one gigabit per second -- fast enough to stream 90 minutes of video from one tower to the next, more than one mile apart, in less than six seconds. By comparison, the same video sent over a DSL or cable Internet connection would take almost an hour to download.

This system is dubbed 'WiFiber' by its creator, GigaBeam, a Virginia-based telecommunications startup. Although the technolo ....etc

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Ultrasonics and Acousto-Optics for the Nondestructive Testing of Complex Materials



Nondestructive testing has become an essential tool for failure prevention, conditionbased maintenance, structural health monitoring, as well as for quality control during production processes. Ultrasound and Acousto-Optics are applied to examine the mechanical properties of isotropic and anisotropic materials, and also to detect material defects. Fiber reinforced composites are ubiquitous in many industries, yet the interaction of ultrasound with such mat ....etc

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Adaptive optics is a new technology which is being used now a days in ground based telescopes to remove atmospheric tremor and thus provide a clearer and brighter view of stars seen through ground based telescopes. Without using this system, the images obtained through telescopes on earth are seen to be blurred, which is caused by the turbulent mixing of air at different temperatures ....etc

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Free Space Optics (FSO) communications, also called Optical Wireless (OW)
Bo Rong, Yi Qian, Member, IEEE, and Kejie Lu, Member, IEEE
Overview

Imagine a technology that offers unsurpassed reliability and

high-speed connectivity. A technology that can be installed globally is

easy to deploy, license-free and offers a fast, high ROI. That

technology is free-space optics (FSO).

Free Space Optics (FSO) communications, also called Optical

Wireless (OW) or Infrared Laser, refers to the transmission of

modulated visible or infrar ....etc

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Adaptive Optics in Ground Based Telescopes

Adaptive optics is a new technology which is being used now a days in ground based telescopes to remove atmospheric tremor and thus provide a clearer and brighter view of stars seen through ground based telescopes. Without using this system, the images obtained through telescopes on earth are seen to be blurred, which is caused by the turbulent mixing of air at different temperatures.

Adaptive optics in effect removes this atmospheric tremor. It brings together the latest in computers, material s ....etc

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Nondestructive testing has become an essential tool for failure prevention, conditionbased maintenance, structural health monitoring, as well as for quality control during production processes. Ultrasound and Acousto-Optics are applied to examine the mechanical properties of isotropic and anisotropic materials, and also to detect material defects. Fiber reinforced composites are ubiquitous in many industries, yet the interaction of ultrasound with such materials is particularly challenging because of effects such as surface roughness, the fact ....etc

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Communication, as it has always been relied and simply depended upon speed. The faster the means ! the more popular, the more effective the communication is !

Presently in the twenty-first centaury wireless networking is gaining because of speed and ease of deployment and relatively high network robustness. Modern era of optical communication originated with the invention of LASER in 1958 and fabrication of low-loss optical fiber in 1970.

http://pptpdf.net/subcategory.php?categ=unknown&categ_id=1&/Seminar%20Reports/computer_science-info ....etc

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Definition
Mention optical communication and most people think of fiber optics. But light travels through air for a lot less money. So it is hardly a surprise that clever entrepreneurs and technologists are borrowing many of the devices and techniques developed for fiber-optic systems and applying them to what some call fiber-free optical communication. Although it only recently, and rather suddenly, sprang into public awareness, free-space optics is not a new idea. It has roots that go back over 30 years--to the era before fiber-optic cable b ....etc

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