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Technology Stocks : fSONA Communications Corporation - Optical Wireless Networks

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To: Frank A. Coluccio who wrote (38)	12/29/2003 9:16:49 AM
From: Peter Ecclesine	Read Replies (1) of 47

Hi Frank, You might look at the February 2004 Cook Report: Free Space Optics cookreport.com Editor: For Broadband wireless back haul free space optics which is to say data delivered over laser pulses through the air is the undisputed broad band champion. Speeds up to a giagbit per second are in commercial use. When fog prohibits line of sight transmission, the system does an automatic fall over to millimeter wavelength radio. We interview fSona Corporation one of the leaders in this area. COOK Report: How did you acquire the technology you are using now? Carbonneau: When I started this company, I approached British Telecom (BT) because they had an R&D program on free space optics transmission that included a prototype that they built. They had also done outdoor testing in London. They had used 1550 nanometer wavelength because they had assumed that the adsorption window at that wavelength would be superior to other wavelengths in foggy wet weather. The other reason for their choice of 1550 was that this wavelength was inherently eye safe. Therefore they could use higher power to transmit, since, at this wavelength, the laser did not penetrate tissue. Higher power would extend the range of the device. They felt that as a telco they could not risk the liability of being out in a public space with any wavelength of light that could potential damage the eye. . . . COOK Report: What if you were trying to connect the edges of two metro areas? Can you create a free space optics pop where without a building you just interconnect a pair of your devices? Carbonneau: Yes. This has been done in Belfast. Corcoran: We can literally daisy chain our link heads back-to-back. We have single mode fiber that feeds them with 100% digital regeneration. There is no intermediate device needed. Theoretically you could string 100s of these together with the only concern being latency that is virtually undetectable and jitter that would be only a nominal factor. Latency and jitter is typically introduced only when there is an intermediate device that is typically used by microwave radios. In our case we don?t need this because we do our own digital regeneration. Our customer?s do daisy chain for link budget purposes. Let?s assume you are down in Santa Monica where you do get west coast fog. There you will need repeaters every 700 meters to ensure five nines of connectivity uptime. Digital regeneration is also done for line-of-sight purposes. Lets assume that you are doing SONET protected ring and you need to turn a corner. You put one link head in and slam in a second redirected at 90 degrees and connect them with single mode fiber. Do this and you turn a corner. Internal digital regeneration of the signal gives us this kind of flexibility. petere

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