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State the principle of WDM and advantages of DWDM.
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  • In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light.
  • This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity.
  • The term wavelength-division multiplexing is commonly applied to an optical carrier (which is typically described by its wavelength), whereas frequency-division multiplexing typically applies to a radio carrier (which is more often described by frequency). Since wavelength and frequency are tied together through a simple directly inverse relationship, in which the product of frequency and wavelength equals c (the propagation speed of light), the two terms actually describe the same concept.

ADVANTAGES OF DWDM

  1. The DWDM point-to-point architecture is simple to build and troubleshoot .
  2. It enables protocol transparency, increme-ntal growth, and capacity expansion over time, while dramatically reducing start-up costs.
  3. Point-to-point solutions are also extremely efficient.
  4. No amplifiers or additional equipment required.
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