Applications
Issue 8.0 July 2002
2-37
Wavelength Division Multiplexing (WDM) 2
The circuit-carrying capacity of lightguide cable can be increased by transmitting
two signals of different wavelengths simultaneously over a single fiber. WDM is
the combination of two lightwave signals at different wavelengths.
The device used to implement WDM for the FT-2000 OC-48 Lightwave System is
called a WDM filter. Figure 2-17 is a high level diagram depicting how the WDM
filters multiplex and demultiplex a single-mode 1.3 µm wavelength signal and a
single-mode 1.5 µm wavelength signal, enabling the two signals to operate on the
same fiber pair. Thus, one FT-2000 OC-48 Lightwave System and one FT
Series G 1.7 Gb/s system or two FT-2000 OC-48 Lightwave Systems at the same
location, each equipped for lightwave transmission at different wavelengths, can
share the same fiber pair.
Figure 2-17. Wavelength Division Multiplexing Application
(1.3 µm/1.5 µm)
1.3 m Receiver
Filter
Demux
1.5 m Receiver
1.5 m Transmitter
Filter
Mux
1.3 m Transmitter
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