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Technology Stocks : Silkroad
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To: ahhaha who wrote (32)11/11/1998 12:04:00 PM
From: Webster Groves  Read Replies (2) of 626
 
Let's start with this statement:

<< In a dramatic demonstration, 840 channels of satellite
programming were transmitted 100 kilometers over a
fiber optic cable at 93 gigabits per second using only a
single laser. >>

Now, I'm no TV expert, but how much bandwidth does a single
TV channel take ? Let's be generous and say 10 MHz. Multiply that
by 840 channels (you do the math) and we get 8.4 GHz total
bandwidth. Where does the 93 GHz come in ? Perhaps that's
the center frequency of the IF modulator; so the fractional
IF bandwidth used is 9 %. What's so dramatic about that ?
Maybe they used 840 televisions all at once ?

webster

P.S. On further thought, it all makes sense. The modulator
is a dielectric (perhaps quartz or TiO2 or even
lithium niobate) loaded waveguide.
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