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To: Webster Groves who wrote (580)	2/21/2000 10:34:00 PM
From: ahhaha	Read Replies (1) \| Respond to of 626

Let's take a look at what you penned back then: An external cavity can narrow the laser's linewidth and thereby improve its coherence length, but that's it. That isn't SR. SR deals with taking a stabilized beam carrier and subjecting it to a birefringent doped crystal which is RF pumped. The bi-re effect refractively spreads the beam width and provides "space" so that multiple RF inputs can be embedded. Once you modulate the monochromatic laser signal,it is no longer monochromatic(but you know that), and so its coherence length is no longer "infinite". A 20 GHz external modulator certainly adds a lot of bandwidth capacity, and perhaps 40-60 GHz is in the cards, but not 30 THz. The definition of "modulate" is to vary the frequency of a carrier wave. If I modulate the monochromatic color green to the monochromatic color red, how is it that red is no longer monochromatic? Or is it the case that you don't mean that? What do you mean? No doubt coherence length is important but the method of changing it is more important, far more important, and beyond that is what you do with the coherent linewidth once you've maintained its coherence. It's interesting that you're giving yourself a way out in case SR works as advertised, the discounting comes with "30 THz". If SR can do 20GHz, then 30 THz is only a matter of engineering, not one of principle. The principle will support far higher densities and 400 GHz has been achieved by SR in the field under independent observation and confirmation. If you believe my comments about Hasegawa's findings in solitons is inaccurate or misleading or have no similarity to SR or have no relevance to optic transmissions at high density, then I invite you to review his paper and make your claims: xxx.lanl.gov