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On 02/26/05 02:56, James McLean wrote:Well, in that sense a hall of mirrors could be called a waveguide. I
How can it be that a fiber optic cable "works like a wave guide"?
It's a waveguide in the sense that it guides the wave.
Oh yeah, of course. Actually, I realized this about 48 hours after myThe apparatus that we have has a single-fiber cable, the fiber being
maybe 0.75mm in diameter (I don't have it handy to measure exactly).
That's core+cladding+protective jacket. The physically-
relevant dimension is the core diameter, which is a
whooole lot smaller.
Huh? Perhaps we have different ideas of what is "easily-observable"?I'm sure that the light source is probably not visible but it probably
is in the IR. So if the wavelength is 1 micron, we're in mode 1500 of
the waveguide? That doesn't sound very "scrunched" to me!
Assuming what you've got is communication fiber, it's
probably 1.06 micron light in a 50-micron core. OK,
that's not _very_ scrunched, but even for the 0,0 mode
there would be an easily-observable effect on the speed
of propagation (which is where this thread started).