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Difference between WDM and DWDM
  • Last Updated : 21 Dec, 2020

In this article, we are going to discuss the difference between WDM(Wavelength Division Multiplexing) and DWDM(Dense wavelength division multiplexers). Let’s discuss one by one.

  1. WDM :

    WDM stands for Wavelength Division Multiplexing. It is a fiber-optic transmission technique that enables the use of multiple light wavelengths (or colors) to send data over the same medium. There can travel two or more colors of light on one fiber, and several signals can be transmitted in an optical waveguide at differing wavelengths or frequencies on the optical spectrum.

  2. DWDM :
    DWDM stands for Dense wavelength division multiplexers. These modules put data from different sources together on a fiber optic cable. These modules further increase system bandwidth and capacity by using closely spaced wavelengths to carry multiple signals on the same cable. The channel spacing is reduced to 1.6 nm and less. The cost-effective way of increasing capacity without replacing fiber. There are commercial systems available with capacities of 32 channels and upwards.

Difference between WDM and DWDM :

1. WDM uses a number of light sources, each emits the light of different wavelength. DWDM is WDM utilizing closely spaced channels.
2. In this, Optical multiplexer is used at the input side to multiplex these signals. In this, DWDM assigns the incoming optical signals to specific frequencies multiplexes them for transport over a single fiber.
3. All the signals arrive at the same time, instead of being distributed across time slots. In this, multiple channels of information carried over the same fiber, each using an individual wavelength.
4. It improve the capability of optical cable in carrying data by multiplexing many channel of wavelengths. It increases the bandwidth of systems, without using repeaters.
5. The channel spacing is reduced to 1.6 nm or less. The channel spacing is small 200GHZ.
6. The band used are O and C. The band used are C and L.
7. It cost per channel is low. It cost per channel is high.
8. The number of channels delivered are 2. There is hundreds of channels is possible.
9. The best application is PON. The best application is Long-haul.

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