Subject: How does intensity of light in an optic fibre depends on lengh & diameter

Hello,
You know that many telephone networks now use optic fibres to transmit 
digital information from one location to another. When the distance 
between locations is large, the signal has to be boosted using repeater 
stations placed at certain intervals along the fibre.
Well, if I had to place the repeater stations between the two locations, I 
need to know how the intensity of light at a particular point in a fibre 
depends upon the lengh and diameter of fibre which the light has passed 
through.
The foll. materials are available: two telephones, voltmeter, 
milliammeter, spectrometer, signal generator, scissors, power supply unit, 
lightmeter, oscilloscope, small laser, meter rule, LDR, reels of optic 
fibre of different diameters and screw gauge.
Thanks.

Re: How does intensity of light in an optic fibre depends on lengh & diameter