Introduction to Networking and Data Communication

Data Communication Medial Lesson II

By the end of the lesson you should be abe to: Describe fibre optics Explain how fibre optic transmit data state various types of fibre op[tic

Fibre Optic Cables

Transmit data signal by use of light. The electrical signal is converted by Light Emitting Diodes(LED) to light signal. The light signals then travel through the core of the optic fibre by a series of total internal reflection. The light used is an infrared laser. There is usually less interference for data signal transmitted this way so fibre optics have high bandwidth compared to twisted pair and coaxial cables

Parts of fiber optic cables:

• core- central hollow part. Transmits light signals
• cladding - has light-bending characteristics
• coating/buffer - strengthens the cable
• strengthening fibres -
• cable jacket- the outer covering

Types of optic fibre optic cables

• single-mode - transmits a signal by using a single ray of light
• multimode- transmits  signals by using several rays of different angles of incidence