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To: ahhaha who wrote (301)	3/9/1999 8:21:00 AM
From: Frank A. Coluccio	Read Replies (1) \| Respond to of 626

>I believe I could probably cook up a hand-waving rationalization for it. It is send, receive, management, equipment and other overhead. < See my reply to George. > I was hoping the thread would like to discuss the technical details of the apparatus so far laid out. This is the crux of the matter.< You've done a lot of work thus far, thanks. I now see the relevance of the cavity management. It's germane to the viability of the engine, agreed. I'm having some difficulty accepting the moving parts in the other areas. I'll just have to get used to it. I just missed the express bus that would have gotten me to Wall and Water by 9. Thanks. Later.

To: ahhaha who wrote (301)	3/9/1999 4:12:00 PM
From: George T. Santamaria	Read Replies (2) \| Respond to of 626

....I mean 10 terabits/second, more than 10,000 OC-12 serial encapsulated channels dumped onto one fiber strand which is about the limit of modern fiber. The constraint is the fiber carrying capacity..... What I mean is that with a modulation technique like 64 or 256-QAM, an amplifier with a raw analog B/W of ~1THz at better than 40db S/N will be needed to drive the E/O modulator to handle a 10Tb data rate. Some person named Shannon determined the exact limit for that a long time ago. Do you have one of those amplifiers? I don't and I doubt if the geniuses at SR have one. I must reiterate that I only see one of those EO modulators with only one signal path in the block diagram and there is no scheme for ganging up multiple EO modulators described in the white paper. Yes, the fiber can carry 10Tb but SR is not revealing a viable scheme for reducing the concept to practice.