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New Optical Antenna Brings Massive Benefits to Wireless Networks, Household Electronics and Longer Distance Data Transfer
November 07, 2002A new optical antenna, developed by researchers at the University of Warwick, will bring significant benefits to credit card payments, wireless networks, household electronics and longer distance data transfer.
The device was developed by Professor Roger Green and Roberto Ramirez-Iniguez, in the University of Warwick`s Engineering Department. It applies techniques used to manipulate radio frequencies to select the incoming "signal frequencies" carried on infrared beams to produce the optical equivalent of the radio.
The optical antenna serves the same purpose as an electronic one. It must collect energy from an area and channel it through to a receiving element or, conversely, transmit energy which has originated from a small source over an area.
This new device uses a combination of precise curvatures on the lens part of the instrument with a multi-layered filter. The optical antenna is so precise that it can detect a signal on one particular wavelength of light and it is 100 times more efficient at gathering in a signal than any previous optical sensor of this kind. This has immediate benefits for indoor wireless networks and household devices. It allows signal transmitters and receivers to operate at a significant angle to each other and to discriminate much more finely between signals. For external data transfer applications it can be used to greater distances - up to 3 miles.
Wireless networks are an economical and flexible alternative to wired systems. Lately, two major transmission technologies have been used to achieve indoor wireless communication: RF (radio) and infrared. For many reasons infrared is often preferred - infrared links provide high bandwidth at low cost, infrared is immune to radio interference, the spectrum is freely available, and infrared components are inexpensive, small and consume little power. This new optical antenna will help turn even more people towards infrared as an alternative to the high cost of maintaining wired networks.
Warwick, University of
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