Understanding Optical Fibers for Signal Transmission
"Learn about the fascinating world of optical fibers, used to transmit signals as light over long distances with minimal signal degradation. Explore the construction, advantages, types, transmission process, manufacturing, testing, and applications of optical fibers."
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Presentation Transcript
Introduction to Optical Fibers. Used to carry signals in the form of light over distances up to 50 km. Fibers of glass Usually 120 micrometers in diameter No repeaters needed.
Introduction (Cont) Core thin glass center of the fiber where light travels. Cladding outer optical material surrounding the core Buffer Coating plastic coating that protects the fiber.
Advantages of Optical Fibre Thinner Less Expensive Higher Carrying Capacity Less Signal Degradation& Digital Signals Light Signals Non-Flammable Light Weight
Type of Fibers Optical fibers come in two types: Single-mode fibers used to transmit one signal per fiber (used in telephone and cable TV). They have small cores(9 microns in diameter) and transmit infra- red light from laser. Multi-mode fibers used to transmit many signals per fiber (used in computer networks). They have larger cores(62.5 microns in diameter) and transmit infra-red light from LED.
How Does Optical Fibre Transmit Light?? Total Internal Reflection. When light travelling in a dense medium hits a boundary at a steep angle (larger than the "critical angle" for the boundary), the light will be completely reflected.
How are Optical Fibres made?? Three Steps are Involved -Making a Preform Glass Cylinder -Drawing the Fibre s from the preform -Testing the Fibre
Testing of Optical Fiber TENSILE STRENGTH TEST ABRASION TEST CRUNCH TEST (COMPRESSION TEST) IMPACT TEST REPEATED BENDING TEST TORSION TEST WATER PENETRATION TEST
Areas of Application Telecommunications Local Area Networks Cable TV CCTV Optical Fiber Sensors
