George Gilder - Forbes ASAP Message Board

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Technology Stocks : George Gilder - Forbes ASAP

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To: Hiram Walker who wrote (121)	9/30/1997 4:34:00 PM
From: Tim Bagwell	of 5853

Flouride doped fibers are pretty early in development. I believe Lucent has demonstrated around 100nm of bandwidth. I haven't followed closely so if you find some info that would be useful. Crosstalk could occur due to non-linear behavoir in the fiber. However, I'm not sure where diffraction would enter in. Maybe you mean dispersion? A significant problem with the present EDFA's is that their gain is not flat enough over the 30-40 nm of bandwidth. To compensate this a special type of fiber grating can be used. This is a big business for grating mfgrs. However, the Flouride doped fibers were also reported to have fairly flat gain so this type of compensation may not be needed. Tim

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