who can give me some information about optical fiber?

Answer 1

Optical fiber (or "fiber optic") refers to the medium and the technology associated with the transmission of information as light pulses along a glass or plastic wire or fiber. Optical fiber carries much more information than conventional copper wire and is in general not subject to electromagnetic interference and the need to retransmit signals. Most telephone company long-distance lines are now of optical fiber.
Transmission on optical fiber wire requires repeaters at distance intervals. The glass fiber requires more protection within an outer cable than copper. For these reasons and because the installation of any new wiring is labor-intensive, few communities yet have optical fiber wires or cables from the phone company's branch office to local customers (known as local loops).

Answer 2

the light (which can be from a wide variety of the specturum) bounces between the boundaries of the core because of TIR (total internal reflection - the principle used in tringular prisoms (60 degree)).

The thicker the core, the wider variety of angles - therefore speeds - the light can travel, therefore the fibers are quite narrow to avoid lagging/distortion. Unlike analogue signals (which are selom used through fiber optics) digital signals can be rectified and can travel longer distances without as much signal loss before amplification is needed. They are not affected by magnetic fields.

Answer 3

We can transmit a signal from transmitter to receiver via a channel.We can use many things as required as channel (even air is channel for F.M. & A.M. wave).But the most reliable channel for tele-communication is fibre optics or optical fibre.Fibre optics just a wire , with three different part .The inner most part is made of glass or such material which has high reflexive index.This part is coated with material with diffent density.It is also covered with one or two different coat of rubber and polymar(plastics).Light as signal is passed through the inner coar at "299 792 458 m / s " by jig-jag method or concentric-decentric method.We can reduce noice (internal as well as external) in this optics. Even we power assumption is very low and for this reason, signal does not be affected .But it is costly.

Answer 4

they are very use ful in transmitting information. an optical fibre is made of a core of high refractive index glass or plastic. then coated with glass of lower refractive index. thus the critical angle would be very small and the information of light get internally refracted at the surfaces in the fibre

Answer 5

i could but then what will you give me in exchange?