Question

What is an Optical Fiber?

Optical fiber is the technology associated with data transmission using light pulses travelling

along with a long fiber which is usually made of plastic or glass. Metal wires are preferred for

transmission in optical fiber communication as signals travel with fewer damages. Optical fibers

are also unaffected by electromagnetic interference. The fiber optical cable uses the application

of total internal reflection of light. The fibers are designed such that they facilitate the

propagation of light along with the optical fiber depending on the requirement of power and

distance of transmission. Single-mode fiber is used for long-distance transmission, while

multimode fiber is used for shorter distances. The outer cladding of these fibers needs better

protection than metal wires.

How Does an Optical Fibre Work?

The optical fiber works on the principle of total internal reflection. Light rays can be used to

transmit a huge amount of data, but there is a problem here – the light rays travel in straight

lines. So unless we have a long straight wire without any bends at all, harnessing this advantage

will be very tedious. Instead, the optical cables are designed such that they bend all the light

rays’ inwards (using TIR). Light rays travel continuously, bouncing off the optical fiber walls and

transmitting end to end data. Although light signals do degrade over progressing distances,

depending on the purity of the material used, the loss is much less compared to using metal

cables. A Fibre Optic Relay System consists of the following components:

• The Transmitter – It produces the light signals and encodes them to fit to transmit.

• The Optical Fibre – The medium for transmitting the light pulse (signal).

• The Optical Receiver – It receives the transmitted light pulse (signal) and decodes them

to be fit to use.

• The Optical Regenerator – Necessary for long-distance data transmission.

15 a) If a light travels in a certain medium and it gets reflected off an optically denser medium

with high refractive index, then it is regarded as

a) external reflection
b) internal reflection

c) both a and b
d) none

15 b) The loss in signal strength as light travels in optical fibre is

a) dispersion
b) absorption

c) attenuation
d) scattering

15 c ) The speed at which signals travel in optical fibre is

a) more than speed of light
b) less than speed of light

c) equal to speed of light
d) signals need not to travel
15 d) Optical fibres are used in

a) communication
b) medical

c) decoration
d) all of these​

Answer 1

Answer:

Fiber optics, or optical fibers, are long, thin strands of carefully drawn glass about the diameter of a human hair. These strands are arranged in bundles called optical cables. ... So, the optical fiber transmits “data” by light to a receiving end, where the light signal is decoded as data

Answer 2

Answer:

15) d) All of these.

15) a ) Both a and