What Is DWDM System

With the rapid development of data services, the demand for bandwidth of the transmission network is getting higher and higher. Traditional PDH or SDH technology uses single-wavelength optical signal transmission. This transmission method is a great waste of optical fiber capacity, because the bandwidth of optical fiber is almost infinite compared to the single-wavelength channel currently used. DWDM technology came into being under this background. It not only greatly increases the network capacity, but also makes full use of the broadband resources of the optical fiber and reduces the waste of network resources.

Bandwidth and business limited solutions

a :Re-lay the fiber optic cable

b :Improve fiber single channel transmission rate

The use of TDM to expand the capacity has been approaching the limit of technology. The high dispersion of the laid G.652 fiber limits the transmission of systems above 10Gbit/s.

c: Increase the number of wavelengths transmitted in a single fiber WDM

The rapid development of optoelectronic devices, especially the maturity and commercialization of EDFA, makes it possible to use DWDM technology in the 1550nm window area. From a technical and economic point of view, DWDM technology is currently the most economical and feasible expansion technology method.

What is wavelength division multiplexing?

DWDM nes

DWDM system definition

WDM: Multiplexing optical signals of different wavelengths into the same optical fiber for transmission. This method is called Wavelength Division Multiplexing (Wavelength Division Multiplexing)

At the receiving end, the optical carriers of various wavelengths are separated by a demultiplexer, and then further processed by the optical receiver to restore the original signal.

DWDM: The wavelength interval is between 0.2~1.6nm, and the wavelength interval is relatively dense. Compared with CWDM, it has a larger capacity, more channels, supports EDFA optical amplification, and a longer transmission distance.

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