Optic Fibre & Communication Flashcards
What are optic fibres used for ?
To carry signals in the form of pulses of light or other parts of EM spectrum
What speed do electromagnetic waves travel in a vacuum ?
Same speed in a vacuum
What is the speed of light ?
3.00 x 10(8) ms-1
What is Refraction ?
Bending of light , describe the light ray after it has change direction
What is the incidence ?
The incoming light ray
What does internal reflection refer to ?
When a wave in a optically dense medium hit a Boundry with an optically less dense medium so energy is reflected back onto denser medium
What does critical angle refer to ?
the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
What is total internal reflection ?
All of the wave energy if you selected back into the more dense medium
What waves are in the electromagnetic spectrum?
Radio waves Microwaves Inferred Radiation Visible light Ultra violet X-rays Gamma rays
What wave has the highest frequency and lowest ?
Gamma - highest
Radio wave - lowest
What waves have the longest and shortest wavelength ?
Gamma ray - shortest
Radio wave - longest
What are features of Bluetooth ?
- can go through walls
- short distance (10m)
- radio waves
- connects devices
What is the role of cladding ?
-Reduces energy loss as fewer
reflections happen
-protects the core from damage
What is the core ?
Part of the fibre that guides light
What are features of broadband ?
- used light in optic fibres = faster
- uses multiplex signals (many at one time
