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Digital communications
Digital communications

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Learning outcomes

After studying this course, you should be able to:

  • convert between wavelengths and frequencies

  • describe the main differences between lasers and LEDs as used as light sources for optical-fibre communications systems

  • describe the difference between direct and external modulation of a laser

  • describe the difference in structure and performance of step-index multimode, graded-index multimode and single-mode optical fibres

  • draw up a power budget for an optical-fibre communication link and use it to estimate the maximum link distance.