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Transcript of Fibre Optics
Jessie Tian Fibre Optics http://www.howstuffworks.com/fiber-optic.htm http://www.timbercon.com/uses-of-fiber-optic-cables/ http://www.timbercon.com/fiber-optic-applications/ Light constantly bounces from the cladding (mirror-lined walls), where total internal reflection occurs. Fiber-optic lines are strands of optically pure glass as thin as a human hair.
They are arranged in bundles called optical cables and used to transmit light signals over long distances. Buffer coating - Plastic coating that protects the fiber from damage and moisture Thin glass center of the fiber where the light travels Outer optical material surrounding the core that reflects the light back into the core Cladding Buffer Coating How It's Made Because the cladding does not absorb any light from the core, the light wave follows the law of reflection and can travel great distances. Communications: How it works Future Possiblities The diameter of the optical fibre is large compared to the wavelength of light. Therefore, the reflection of light is similar to that of a flat surface. In other words, there is a maximum angle at which light may enter the fiber so that it will propagate in the core of the fiber. The sine of this maximum angle is called the numerical aperture. Therefore, only light that enters the within a certain range of angles can travel within the wire. This range is called the acceptance cone of the fibre. n > n core cladding Light traveling in an optically dense medium must hit the boundary at an angle larger than the critical angle for the boundary. Recall from light labs http://www.ed.gov.nl.ca/edu/k12/curriculum/guides/science/grade8/Fibre_Optics_STSE_Unit_2.pdf All-Optical NetworkFibre Optics are prAll-Optical Networkevalent in:
- Telephone System
-Cable TV System
Inspection of manmade materials
Plumbing -All -Optical Network -The method of transmitting information from one place to another via pulses of light through an optical fibre. Process in using Fibre Optics in Communications:
-Transmitters are put in place.
- Relaying the Signal along the fibre.
- Converting it into an electric signal. thinner
flexible Physical Aspects Transmission higher carrying capacity
less signal degradation