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Old Jun 27th 2019, 04:26 AM   #1
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Optical fibers

What does it mean this expression physically :

Short laser pulses in optical fibers?
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Old Jun 27th 2019, 07:57 AM   #2
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Where is there a problem with this phrase?
I am struggling to think of any way of expressing it any differently
in any way that might make it more understandable.

Perhaps if you supply some context...
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Old Jun 27th 2019, 08:10 AM   #3
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Originally Posted by meriam04 View Post
What does it mean this expression physically :

Short laser pulses in optical fibers?
It means there are short laser pulses within an optical fibre cable! ^_^
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Old Jun 27th 2019, 09:23 AM   #4
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Originally Posted by benit13 View Post
It means there are short laser pulses within an optical fibre cable! ^_^
Noo, what I need physical meaning not as u have done!!
If someone ask you what is a short laser? what is an optical fiber? what is the relation between them and so on; how will you present the definitions and ...?
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Old Jun 27th 2019, 12:07 PM   #5
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Originally Posted by meriam04 View Post
Noo, what I need physical meaning not as u have done!!
If someone ask you what is a short laser? what is an optical fiber? what is the relation between them and so on; how will you present the definitions and ...?
"short laser pulses" means short pulses from lasers, not short lasers.

Here's a link to optical fibers. These are in development to replace things like phone lines and internet cables. There is very little loss of information using the fibers so they have drawn a lot of interest in the last 30 years or so.

-Dan
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Old Jun 28th 2019, 02:10 AM   #6
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Originally Posted by meriam04 View Post
Noo, what I need physical meaning not as u have done!!
If someone ask you what is a short laser? what is an optical fiber? what is the relation between them and so on; how will you present the definitions and ...?
It is a physical meaning...

As for basic definitions, you can use Google...
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Old Jun 28th 2019, 03:00 AM   #7
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Context

Perhaps where you say "a physical meaning" you mean and engineers or a "practical" meaning.

The usual reason for passing short laser pulses down optical fibres is data transmission.
These laser pulses (on/off) are used to represent digital information.
The shorter the pulses, the more information per second can be transmitted.

However each pulse of laser light consists of lots of photons, and these do not start out travelling perfectly parallel,
this means that during travel down the optical fibre different photons in the same pulse will take slightly different paths,
meeting slightly different imperfections in the fibre,
and so the sharp edged (square shaped) starting pulse will start to spread into a bell shaped pulse.

Over a long distance, if the pulses are too short, neighbouring pulses will start to merge,
If they merge too much, then it will be impossible to distinguish the On/Off digital pattern at the other end
and the data transmission will be corrupted.

Note I have made up my own context to go with your question.
If this is the wrong context, tell us what context you want.
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