The Definition of Wavelength Division Multiplexing

Wave Division Multiplexing (WDM), is a process of separating or combining multiple light wavelengths in or out of a single fiber. Each light wavelength carries various signals. The application of optical fillers facilitates some wavelengths and helps another wavelength range pass through them. It can increase the capacity of the network by implementing the WDM. If there is no Wave Division Multiplexing, only one fibre will be chosen for the voice of each user or each data device. It will make everything costlier due to the need for more fibre.

 

Wave Division Multiplexing Technologies are of 2 Types- CWDM and DWDM

Coarse Wavelength Division Multiplexing (CWDM) allows transporting 18 channels over a fibre. On the other hand, Dense Wavelength Division Multiplexing (DWDM) deals with 200+ channels. The similarity is that both do not depend on protocol. So, you can use any combination of storage, data, and voice on various wavelength channels. However, you will notice a difference in spacing between transmission channels in the electromagnetic field. Infrared light used for WDM lies beyond the visible light spectrum. Wavelengths can range from 1260 nm to 1550nm.

 

Know about Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM)

CWDM are modules to improve the bandwidth level carried by a fibre optic system with multiple signal transmissions at different wavelengths along the cables. Coarse Wavelength Division Multiplexing (CWDM) is advantageous because of its affordability and wide range of frequencies. You can choose Coarse Wavelength Division Multiplexing (CWDM) for applications that involve a short distance.

 

Applications of Coarse Wavelength Division Multiplexing (CWDM) are:

-SAN and LAN connections

-Fiber exhaust relieving system

-Interactions between the client’s premises and the main office

-MANs and WANs

 

One of the advantages of using Coarse Wavelength Division Multiplexing (CWDM) is that you can easily upgrade the system anytime to restrict the installation cost. Due to the wider spacing between channels, requirements are not rigid. There is no need to use costly lasers.

 

Dense Wavelength Division Multiplexing (DWDM) refers to modules, which obtain data from multiple sources on a cable. Moreover, the modules boost the system capacity and bandwidth by maintaining a close space between wavelengths. Dense Wavelength Division Multiplexing (DWDM) systems carry more than one signal on a particular cable.

 

You will find denser multiplexed channels in Dense Wavelength Division Multiplexing (DWDM) systems because the wavelength is tighter to accommodate more channels.

 

Comparing CWDM and DWDM

Dense Wavelength Division Multiplexing (DWDM) has a higher capacity and is a costlier option. The communication range is shorter in the case of CWDM. Besides, the wavelength space is more if you use CWDM. A cooling laser is not used in this system. DWDM ensures better performance and higher safety.

 

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