Optical Fibres

Question 1

How does light reflect inside thin glass fibres?

Answer 1

Light reflects from side to side inside the glass. All of the light is reflected with LARGE “in” angles (more than 40 degrees.)

Question 2

What are Optical Fibres?

Answer 2

Optical Fibres are thin threads of glass. They carry light from one end of the thread to the other.

Question 3

What is a typical use case for Optical Fibres?

Answer 3

Optical Fibres are used in Telephone Cables, Cable Television, Computer Networks, Security Cameras and Internet connections.

Question 4

What signals do Optical Fibres transmit?

Answer 4

Optical Fibres are used to transmit light signals.

Question 5

How fast does light travel through air?

Answer 5

Light travels 300 million metres per second in air.

Question 6

How fast does light travel through glass & Optical Fibres?

Answer 6

Light travels more slowly in glass & Optical Fibres - 200 million metres per second.

Question 7

What are the advantages of using Optical Fibres?

Answer 7

• Optical Fibres carry more signals. For example you can get television, telephone, and internet connection through the same Optical Fibre cable.
• Less Interference - not affected by the weather or electrical equipment.

Question 8

Which telecommunications system requires repeaters?

Answer 8

Optical Fibres