Dense Wavelength Division Multiplexing - DSpace at CUSAT ...

Dense Wavelength Division Multiplexing
WDM with Two channels:-
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(1310 nm + 850 nm)
(1310 nm + 850 nm)
Fig-01 DWDM with Two channels
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The early 1990s saw a second generation of DWDM, sometimes called narrowband WDM, in
which two to eight channels were used. These channels were now received space at an interval of
about 400 GHz in the 1550 nm window. By the mid 1990s, dense WDM (DWDM) systems were
emerging with 16 to 40 channels and spacing from 100 to 200 GHz. By the late 1990s DWDM
systems had evolved to the point where they were capable of 64 to 160 parallel channels, densely
packed at 50 or even 25 GHz intervals.
Progress of the technology can be seen as an increase in the number of wavelengths
accompanied by a decrease in spacing of the wavelengths. Along with increased density of
wavelengths, systems also advanced in their flexibility of configuration, through add- drop
functions, and management capabilities.
Division Of Computer Engineering, SOE 2