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Utilize the transmission performance that can be achieved
May 08, 2018

Dense wavelength division multiplexing (DWDM) is a technology that can combine a group of optical wavelengths to transmit using one optical fiber. This is a laser technology used to increase bandwidth over existing fiber backbone networks. More precisely, the technique is to multiplex the tight spectral spacing of a single fiber carrier in a given fiber in order to take advantage of the transmission performance that can be achieved (eg, to achieve minimal dispersion or attenuation). In this way, at a given information transmission capacity, the total number of fibers required can be reduced.

With the rapid deployment of broadband Internet services such as Internet Access and video, the transmission capacity of the Backbone network must also increase. At present, commercial SDH STM-16 (2.5 Gb/s) systems will have a shortage of capacity in the future. Therefore, many manufacturers are attempting to increase the capacity of SDH transmission systems to 10 Gb/s (STM-64). The capacity of the transmission system is further increased to 40 Gb/s (STM-256), and it still needs a breakthrough in semiconductor technology. As optical technologies such as semiconductor lasers, optical amplifiers, and optical filters are maturing, DWDM technology is booming. In addition to avoiding the problems associated with high-speed TDM transmission, DWDM also improves the existing optical fiber deficiency phenomenon, and provides large-capacity and diverse products. The broadband service enables network operators to increase the transmission bandwidth to 16, 32, 64 or even 128 times at an effective cost. The development of these technologies will lead the future trend of the backbone network architecture.

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