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Wavelength Division Multiplexing.pdf

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Dublin Institute of Technology School of Electronic and Communications Engineering Optical Communications Systems Dr. Yuliya Semenova Wavelength Division Multiplexing Unauthorised usage or reproduction strictly prohibited Copyright 2003, Dr. Yuliya Semenova, Dublin Institute of Technology Wavelength Division Multiplexing 2 Optical Communications Systems, Dr. Yuliya Semenova, School of Electronic and Communications Engineering Unauthorised usage or reproduction strictly prohibited, Copyright 2
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  Dublin Institute of Technology School of Electronic and Communications Engineering Optical Communications Systems Dr. Yuliya Semenova Wavelength Division Multiplexing Unauthorised usage or reproduction strictly prohibited Copyright 2003, Dr. Yuliya Semenova, Dublin Institute of Technology Wavelength Division Multiplexing  2 Optical Communications Systems , Dr. Yuliya Semenova, School of Electronic and Communications Engineering Unauthorised usage or reproduction strictly prohibited, Copyright 2003, Dr. Yulia Semenova, Dublin Institute of Technology Introduction Wavelength Division Multiplexing (WDM) is the basic technology of optical networking. It is a technique for using a fibre (or optical device) to carry many separate and independent optical channels. WDM is the basic technology for full optical networking. Simple (Sparse) WDMSimple (Sparse) WDM  3 Optical Communications Systems , Dr. Yuliya Semenova, School of Electronic and Communications Engineering Unauthorised usage or reproduction strictly prohibited, Copyright 2003, Dr. Yulia Semenova, Dublin Institute of Technology Simple (Sparse) WDM Wavelength selective couplers are used both to mix (multiplex) and to separate (demultiplex) the signals. The distinguishing characteristic here is the very wide separation of wavelengths used (different bands rather than different wavelengths in the same band).Some systems use a single fibrebidirectionallywhile others use separatefibresfor each direction (as illustrated). Other systems use different wavelength bands from those illustrated in the figure (1310 and 1550 for example). The most common systems run at very low data rates (by today's standards). Common application areas are in video transport for security monitoring and in plant process control.  4 Optical Communications Systems , Dr. Yuliya Semenova, School of Electronic and Communications Engineering Unauthorised usage or reproduction strictly prohibited, Copyright 2003, Dr. Yulia Semenova, Dublin Institute of Technology Dense WDM Links WDM Functions SchematicWDM Functions Schematic Each optical channel is allocated its own wavelength -or rather range of wavelengths.  A typical optical channel might be 1 nm wide. This channel is really a wavelength range within which the signal must stay. It is normally much wider than the signal itself. The width of a channel depends on many things such as the modulatedlinewidthof the transmitter, its stability and the tolerances of the other components in the system.
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