Fiber Optics in Telecommunication

Topics: Optical fiber, Laser, Fiber-optic communication Pages: 24 (8905 words) Published: February 12, 2013
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ASSIGNMENT COVER

|Course code: |CS 300 | |Course name: |Telecommunications | |Assignment title: |Fiber Optics In Communication | |Instructor’s name: |Christos Arslanidis | |Student’s name: |Christian Pandis | |Date: |10/12/12 |

|Comments: | | | | | |Grade: |/100 |

Fiber Optics in Communication
Definition
A fiber is a flexible, hair – like strand of a substance and is the smallest visible unit of any textile product. It is very much long in relation to its width or at least one hundred times longer than it is wide. A particular fiber’s properties are dependent upon its physical structure and chemical composition. Manufacturers use fibers whose properties suit the products they market. Citing for example, when used in clothing, fibers must specifically possess certain properties such that it must feel pleasant to the touch, it must be absorbent, the fiber must have a good luster, and last but not the least, the fabric must drape to fit the body. Spandex, one class of fiber has the ability to stretch like rubber. The durability and strength of a fiber are important specifically when it is used for industrial purposes. One particular fiber, SPECTRA – 900, is characteristically ten times stronger than steel (The World Book Encyclopedia, volume seven, p. 87).

Fiber optics, therefore is a branch of physics that is based on the transmission of light through transparent fibers of plastic or glass. The book further notes that optical fibers are capable of carrying light over long distances. The said distances can range from a little of few inches or centimeters up to more than one hundred sixty kilometers, or also equivalent to one hundred miles. These optical fibers either work individually or in bundles. There are some individual fibers whose diameter measures less than 0.001 inch or also equivalent to 0.025 millimeter (p. 88).

Optical fibers have extremely pure core of plastic or glass. Optical fibers are surrounded by an outer covering more commonly known as a cladding. Be it from any source as light bulb, or laser, the light enters just one end of an optical fiber. The cladding are designed such that bends inwards. Such is the direction so that light rays strike its inside surface. The cladding serves to keep the light inside as light travels through the core. A detector at the outer end of the fiber receives the light. These detectors are the photosensitive device or the human eye (The World Book Encyclopedia p. 88).

Single mode and multi mode fibers are the two kinds of optical fibers. Single mode fibers have extremely small cores. As a light source, single mode fibers require the use of special lasers. Such condition is the result of their nature of accepting light only through the axis of the fibers. There is a need for these single mode fibers to be connected to the laser, the detector and the other fibers in the system in utmost...

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