Fiber Optics question

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My understanding of Internet is somewhat rudamentary and I have a
question for you people. How is Fiber Optic cables make my Internet
connection faster if the rest of the world is using copper cables? Are
we all wired together in one global web network?


Re: Fiber Optics question wrote:
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The Internet is divided into "roadways", just like the highway system.
There are small, two lane, local roads. And there are the major highways,
with many lanes on either side of the road.

The connection from your Internet provider, to your house, could be done
with wires. The data rate is normally pretty low.

At the Internet provider, they "concentrate" all of the traffic from
thousands of users connected to each multiplexer. Not everyone
downloads big files at the same time, so there is less traffic than
you might think. There might be 1000 people with 1 megabit per second
plumbing, but perhaps only a total of 100 megabits per second of traffic.
Your Internet provider, connects to a larger Internet provider. The
connection will likely happen with a fiber optic cable.

Fiber optics can carry a lot of traffic. More than one optical wavelength
can be used. I think a single wavelength could carry in the neighbourhood
of 40Gb/sec, enough for many many Internet providers, and perhaps a single
fiber could carry all the traffic for a small city.

Fiber optics are relatively expensive, so you really want to be using
the fiber, to help pay for it. Empty fiber cables don't pay for themselves.

There are communities, that are wiring the last mile of the Internet with
fiber optics. Some people have "fiber to the home" (I'm not really up
on the latest acronyms for this). The fiber cabling and optical methods
used, won't be quite as sophisticated as the major Internet highways
would be, but that helps keep the cost down. The problem with fiber
optics, is the cost is still a bit higher than using copper. But the
companies that are currently installing fiber optic interconnect, are
hoping that new services, like movies on demand, would help pay for
the investment in the new fiber optic cables.

Fiber has tremendous bandwidth. Wires less so. A major achievement years
ago, was to connect two distant cities in Canada, at 274Mb/sec, via a
high voltage coax cable (the high voltage powered buffer amplifiers
along the route). Now, one fiber optic cable, can carry 40000Mb/sec on
a single wavelength, and the cost of installing that one fiber, is a
lot cheaper than stringing the fat 274Mb/sec coax. When the bulldozer
digs a trench for fiber optic cable, the cable used may have dozens
of individual fibers. If you do a bit of multiplying, I think you can
see that fiber is the best kind of interconnect for the "major
highways" of the Internet.

And if this is a homework assignment, don't forget to give me
credit, when you copy & paste :-)


Re: Fiber Optics question

Thanks Paul. My homework days are far behind me - I am 47 yo. Just want
to understand the world around me.


Re: Fiber Optics question

Paul wrote:
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Fiber does have 1 weakness over copper. It's glass, if you kink it, you
can easily break it. With a quiet yet alarming pop. :)

Re: Fiber Optics question

on another hand it has many good things,
for example it is not affected by Electron Magnetic Resonance

Alan Kakareka
Data Recovery Service
786-253-8286 cell
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Re: Fiber Optics question

Alan Kakareka wrote:
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Please don't top-post.  Especially when you install a sig marker
above the quoted material, thus chopping it all off.

BTW, EMR stands for Electro-magnetic radiation.  See Maxwells

Chuck F (cbfalconer at maineline dot net)
   Available for consulting/temporary embedded and systems.

Re: Fiber Optics question

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  He probably was concerned about them seeing the wiring
of his secret device, if they MRI it.


Re: Fiber Optics question

I ment it is not affected by electomagnetic fields

Alan Kakareka
Data Recovery Service
786-253-8286 cell
Quoted text here. Click to load it

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