1. DWDM is the abbreviation of Dense Wavelength Division Multiplexing, which is a laser technology used to increase the bandwidth on 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). With a given information transmission capacity, the total number of required fibers can be reduced.
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Third, the mechanical terms: WDM: Wire Digram Manual, line construction manual. The manual regulates the connection and layout of aircraft lines.