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Technology Stocks : TeraBeam
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To: Leigh McBain who wrote (156)3/25/2000 1:05:00 AM
From: Webster Groves  Read Replies (1) of 227
 
<<Most optical transmission systems also use more than one transmitter, therefor you would also have to block more than one beam to actually cause a disruption of service. At least that is certainly the case with our product.>>

Good point. The system could use two 4 cm dia. beams (for example) spaced 50 cm apart and get around the bird problem, unless bald eagles are no longer endangered.

But with redundant beams paths, don't you have to worry about phasing the path lengths well enough so that the time difference for reception is compensated. For a gigabit/sec data rate, you'd need to individually compensate each receiving station to less than 7.5 cm (90 degree) path length difference (combo of optical and electrical path lengths). Shouldn't be that hard to do, but adds complexity and therefore cost. Higher data rates make phasing even harder.

- wg
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