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How Fiber Optics Work


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Week 10 Homework

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How Fiber Optics Work

  1. 1. 1.introduction of How Fiber Optics Work● The telephone system,the cable TV system or the Internet are related to fiber-optic cables.● Fiber-optic lines are strands of optically pure glass as thin as a human hair.● The strands carry digital information over long distances.● Fiver-optic lines are also used in medical imaging and mechanical engineering inspection. In this article, we will show you how these tiny strands of glass transmit light and the fascinating way that these strands.
  2. 2. 2.What are Fiber Optics?・FeatureMade by pure glass, which is very thin as long as a human hair.It called optical cable, it transmit light signals over long distance.・ContextureCore - Thin glass center of the fiber where the light travelsCladding - Outer optical material surrounding the core thatreflects the light back into the coreBuffer coating - Plastic coating that protects the fiber fromoutside・TypeSingle-mode fibers - have small cores and transmit infrared laserlightMulti-mode fibers - have larger cores and transmit infrared lightof LED
  3. 3. 3.How Does an Optical Fiber Transmit Light?● The light in a fiber-optic cable travels through the core (hallway) by constantly bouncing from the cladding (mirror-lined walls), a principle called total internal reflection.● Because the cladding does not absorb any light from the core, the light wave can travel great distances.● And, light finally reaches a target place.
  4. 4. 4.A Fiber-Optic Relay System?・Device to communicate(1)Transmitter-Produces and encodes the light signals. It receives and directs the optical device to turn the light "on" and "off", and then it produces a light signal.(2)Optical fiber - Conducts the light signals over a distance. It is core communicate device.(3)Optical regenerator - May be necessary to boost the light signal. It produces a new stronger light signal. This device task is a laser amplifier for the incoming signal.(4)Optical receiver - Receives and decodes the light signals. It gets the incoming digital light signals, and then decodes them. They are sends the electrical signals to the various
  5. 5. 5.How Fiber Optics Work・Advantages points – compared to copper wire(1) Less expensive (5) Light signalsCheaper than copper wire. Optical fibers are not interfered from other fibers.(2) Thinner (6) Low powerSmaller diameters than Optical fibers uses lower-powercopper wire. transmitters.(3) High carrying capacity (7) Digital signalsOptical fibers cab be bundled Optical fibers are suited tofibers than copper wire. carry digital information over(4) Less signal degradation internet.The loss signal is less than in (8) Non-flammablecopper wire. No electricity, therefore is not caused fire hazard. These are only part, more points exist.
  6. 6. 6.How Are Optical Fibers Made? Optical fibers are made of extremely pure optical glass. Then, how are they made? Making optical fibers requires the following steps: 1. Making a preform glass cylinder 2. Drawing the fibers from the preform 3. Testing the fibers