5.10 - Fibre Optic Flashcards
What are the three main parts of a fibre optic?
- The core
- The cladding
- The coating
What is the Core?
The core, made of glass or plastic provides the path for light propagation
What is the cladding?
The cladding surrounds the core and prevents the light exiting the core
What is the coating?
The coating, or buffer protects the core and cladding and provides strength
What is the term bandwidth
Bandwidth refers to the amount of data you transfer in a unit of time
What are the two main types of fibre
- Single mode fibre
- Multi mode fibre
Which type of fibre has the large core?
Multi mode fibre has a large dia core
What are the main types of multi mode fibre?
- Step Index
- Graded Index
What what is the refractive index inside the core of a step index fibre?
It has a uniform refractive index. This causes a sharp decrease in refractive index at the core cladding boundary
What what is the refractive index inside the core of a graded index fibre?
The e refractive index decreases as the distance to the Center of the core increases
What is a basic fibre optic system consist of?
- Encoder
- Decoder
- Couplings
- LED light or laser
- Fibre connecting the two units
Advantages of Fibre Optic transmission
- Weight Saving
- Immune to electromagnetic interference and radio frequency interference, cross talk, impedance problems
- High bandwidth and speed
- Very little signal loss during transmission
- Cost is decreasing
- Lightweight and smaller diameter
- More tolerant of mechanical abuse
- Less transmission energy
- Difficult to tap so more secure
Disadvantage of fibre optic transmission
- The need for optical and electrical converters
- Repair and splicing require special methods
- Terminations require special care
- Laser source can be hazardous
What are the 3 basic principles critical to an efficient fibre optic connection.
Perfect Core Alignment
Physical Contact
Pristine Connector Interface
