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To: Tim Bagwell who wrote (378)	2/18/1998 3:38:00 AM
From: R. Allan Choiniere	Respond to of 1219

Hi Tim, Your posting helped to clear up the picture some for me. I'd like to focus in on something you wrote. Also, as the bit rate increases some energy begins to spill over into the adjacent channel leading to a similar result. If I am imagining this write it's because. Well here's an analogy to stretch out time. A single plus is like turning on a florescent light it takes a moment to warm up and put out proper reading light. This warm up time is distortion because the frequency are not within the range for that channel, but it's also not a lot of energy. As bit rate climes the ratio for energy in the plus between readable portion and the distortion starts to narrow. In a fiber with multiple channels distortion has cumulative properties were the readable signal strength for each channel doesn't. I just went back and re-read what you wrote and I think I understand dispersion. Let's see if I have correctly. Given that the readable portion of the pulse is getting so short we are no longer have the time to wait for the frequency of the light to plateau. The signal is being read while the frequency is still in a state of flux. The problem is compounded by higher frequencies traveling faster than lower ones putting potentially holes in the signal causing it to be miss read. R. Allan Choiniere PS. I hope I'm not way off with that florescent light stuff. Just be glad I didn't try to land an airplane on that plateau.