User's Manual

Powerwave Fiber Optics
VM100 56/EN – User’s Manual Rev. P1A9-Draft 2004-11 4 - 13
Duplex Transmission
This section contains two examples of full-duplex transmission over fiber.
Figure 4-12. Duplex transmission between an RMU and a FOR unit
The first example, shown in Figure 4-12, illustrates the same repeater configuration as
in the previous section, but now with full-duplex over one fiber achieved by using an
optical WDM (DX O) in each repeater.
The downlink wavelength is 1550nm, the uplink wavelength is 1310nm.
The power loss for an optical WDM is 1dB. Additional connectors add the loss by 0.5dB
each.
The WDMs are included in the FOUs.
Figure 4-13. Duplex transmission between a BMU and three FOR units
The second example, shown in Figure 4-13, illustrates a BMU and three FOR units
interconnected via optical splitters in a chain configuration. Full-duplex over one fiber
is achieved by using an optical WDM (DX O) in each repeater node.
The downlink wavelength is 1550nm, the uplink wavelengths are 1308nm, 1310nm, and
1312nm from the three slave nodes (FOR).
1
RMU FOR
DL
UL
BTS
DL = 1550nm
UL = 1310nm
DX
O
DX
O
1
BMU
DL 1550nm
BTS
FOR
UL 1308nm
FOR
UL 1310nm
30
70
FOR
UL 1312nm
DX
O
DX
O
DX
O
DX
O
50
50