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Powerwave Fiber Optics
VM100 56/EN – User’s Manual Rev. P1A9-Draft 2004-11 7 - 5
Bi-directional transmission
Bi-directional, or duplex, transmission can be used to simultaneously communicate in
both directions over the same fiber.
Figure 7-6 shows the principle of this communication type.
Figure 7-6. Bi-directional transmission
Graphic Symbol
Figure 7-7. WDM graphic symbol
Figure 7-7 shows the graphic symbol for the optical WDM, Wavelength Division
Multiplexer (according to the EIA/TIA-587).
Example
This example illustrates a duplex transmission using WDMs and optical splitters.
Figure 7-8. Duplex transmission with WDMs
Figure 7-8 shows a duplex fiber network with different wavelengths for downlink and
uplink. The master unit transmits 1550nm and receives 1308nm, 1310nm, and 1312nm
from the three slave units.
WDM
WDM
TX – 1310nm
RX – 1550nm
RX – 1310nm
TX – 1550nm
1310nm
1550nm
DX
O
1
1550nm
1308nm
30
70
DX
O
DX
O
50
50
1550nm
1310nm
DX
O
1550nm
1312nm
DX
O
1550nm
1308nm
1310nm
1312nm