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To: George T. Santamaria who wrote (170)	1/27/1999 12:47:00 AM
From: Webster Groves	Read Replies (1) of 626

<<. If the 200 GBit data rate were a single serial data stream, the wavelength would be 3 x 10^10 cm/sec / 2x10^11/sec = 0.15mm (0.006"). It would take a very small microelectronic structure just to transmit and manipulate the signal for modulation.>> I took this problem to work and our Thinking Machines supercomputer came up with the answer that 3x102/2x1011 = 0.15 cm (not mm), so things are not so bad. By the way the correct answer to your preface (I believe) is ""mm-wave mixers"; they are commercially available from a few sources. <<To me DWDM has one advantage in that I can conceptually agree with combining a number of streams at 2.5GB ( as electrical signals they are: 3 x 10^10 cm/sec / 2.5x10^9 /sec = 25mm wavelength) optically because the technology for modulation is fathomable.>> Once again the TM computer says answer is ......12 cm (not 25 mm = 2.5 cm). I once had problems like this when using an HP calculator with donut sugar in the keyboard. Try using a supercomputer; they don't allow donuts in the computer room. Now back to very infrequent lurking....... -wg Sorry to appear flippant, but that's me - no offense intended.

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