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What is the difference between WDM and CWDM?
Let us understand what Wavelength Division Multiplexing (WDM) is.
WDM
WDM represents Wavelength Division Multiplexing. WDM is completed only in fibre optic channels. In WDM, various light waves from several sources are connected using a prism to form a composite light signal transmitted across the channel.
The application of WDM is the SONET web in which various optical fibre lines are multiplexed and demultiplexed. There is a new technique referred to as DWDM (dense WDDM). It can create multiple huge computers of the medium by composing mediums closer to one another. It achieves even higher efficiency.
Types of WDM
There are two types of WDM, which are as follows −
Dense Wavelength Division Multiplexing
It is a technology in which several optical signals (laser light) of several wavelengths or colors are grouped into one signal and are sent over the connecting channel to an extended area.
When the optical signal transmission distance shifts into hundreds of kilometers, few signal losses will appear. It can satisfy this signal loss, optical fibre amplifiers are used in the DWDM transmission system.
The DWDM technology required this gain bandwidth to transmit several optical signals together effectively. DWDM can share up to 80 channels (80 optical signals) with 100 GHz (0.8 nm) spacing.
Coarse Wavelength Division Multiplexing
CWDM is a technology in which multiple optical signals (laser light) of multiple wavelengths or colors are combined into one signal and are transmitted over the transmission channel for a short interval.
DWDM technology is generally useful for long-distance transmission higher than 100 km. But, if the transmission distance is less than 100 kilometres, we do not require facilitating optical amplifiers.
The CWDM system has a channel spacing of 20 nm among the optical signals. This allows the assistance of cheap elements, such as uncooled lasers, MUX, and DEMUX.
CWDM
CWDM is a technology in which multiple optical signals (laser light) of multiple wavelengths or colors are combined into one signal and are transmitted over the transmission channel for a short interval.
The CWDM system has a channel spacing of 20 nm among the optical signals. This allows the assistance of cheap elements, such as uncooled lasers, MUX, and DEMUX.
Multiplexing is the technique of magnifying the communication capabilities with the use of fibre optic cables. This technique maximizes the communication capabilities and CWDM (Coarse Wavelength Division Multiplexing) combines various signals along the fibre optic cable on laser beams. There are multiple wavelengths and channels are used for transmission and the functionalities are much greater than conventional standard Wavelength Division Multiplexing (WDM).
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