Wavelenght division multiplexer (WDM)

E5.2.8.5 Wavelenght division multiplexer


  • Fiber coupled dode laser.
  • Wavelenght 980 nm and 1550 nm.
  • Coupling efficiency.
  • Optical multiplexer.
  • Optical demultiplexer.
  • Data transmission.
  • Fiber losses.
  • Speed of light.
Principle of operation

The basic idea of the wavelength division multiplexer WDM makes use of an optical grating. It is well known that such a grating can separate an incoming light beam into its fundamental wavelengths. The reverse process, combining two beams with wavelengths, for example, λ1 and λ2 into one beam is the fundamental idea of the WDM. Of course also many other beams with different wavelengths can be combined to one beam and transported via one optical fibre. In telecommunication for each transmission channel a specific laser with a specific wavelength is required. The digital or analogue modulated laser beams are combined and travel through the transmission fibre and at the destination they are separated by means of a demultiplexer which works in the same way as the multiplexer.

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