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Technology Stocks : LUMM - Lumenon Innovative Lightwave Technology Inc.
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To: Herc who wrote (2330)6/23/2001 10:37:59 PM
From: Frank A. Coluccio   of 2484
 
Herc, the student is basing his assertion on a certain set of assumptions. From what I can tell he's extrapolating on the basis of an on-off keying, either straightforward NRZ or RZ. From there he goes on to conclude that for every so many Gb/s of signal there is a requirement for so many GHz of spectrum on the fiber. I believe that he is ignoring other forms of modulation that are now on the drawing boards. Indeed, some of them are already shipping. I'm referring to various forms of subcarrier modulation schemes such as QPSK, QAM and others that demonstrate higher bit to hertz efficiencies: 2*x, 8*x, 16*x, etc. When combined with polarization controls, I tend to think that even higher bit efficiences per unit spectrum can be achieved. What does this mean? From a theoretical perspective higher lambda counts are achievable (and usable to support higher bit rates) than what he's concluded. How many? I don't know.
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