Friday, April 10, 2020

Optical Sources Source  optics  berfungsi  sebagAI  transmitterLight  a membring information.  Sourcethe must  memeet the  requirements  of  adalah (Singer, 1991, Thomas, 1995): • The light that is produced must      centurymedium monochromatis. • Has high power output yes with intensity high  so that it  can  overcome the dampingof along the fiber channel.

 Easily modulated by sin andal information. • Has a small dimension da     n  mudah connected by fiber.  Source  optics  which  umuI'm  used  toopti fiber communication systemk  is LED ( lightemitting  diode)  dan  LD  (laser  diode).  Kboth of them is  a  semi arrangementconductor connection P-N when given a forward bias will radiate energy optics in the form of photons. Bigenergy photon emitted is (Zanger, 1991):  pE  h f= ⋅   

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 (1) h is the  Planck constant  (6.626 x  10-34  J-s) and  f  is the  frequency of the  gelombang  cahaanda  yangemitted. With a demicn  wavelengthemitted (Zanger, 1991):  gh cEλ⋅=    (2) Eg  is  energyband gap (ctake the field) and c is light speedanda (3 x 108 m/s).  The intensity of the light produced by the LED is moreh low dibaLED with  LD, up to  LEDgenerally only usedn for fiber optic systems  pende distancek  like  pada  buildings  andplane  flying. Whereas  LD  with intensityhigh and coherentlift as appropriate on the wireless communication systemk far away (Thomas, 1995). LED  Burrus  is  one of  a  kind  LEDheterojunction  dengan beet surface. 

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