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5.
Calculating System Loss Budgets
5.1
This section describes how to calculate the loss budgets of a system using a Pretium EDGE Tap
Module. Note that you will need to calculate one loss budget for the LIVE system (Figure 4) and two different
loss budgets for the Tap output (Figure 5 and 6).
Table 1 indicates the system loss values of the system components:
Component
MTP® mated pair loss
LC mated pair loss
Splitter 50/50 (dB)
Splitter 30/70 (dB)
1
Insertion loss specifications when mated to other system components of a like
performance specification
5.2.
To calculate the system losses, add the loss values of the components as illustrated in the examples
shown in Figures 4, 5, and 6.
Budget loss for a LIVE multimode system using OM4 fiber and 50 /50 splitters:
LC mated
pair
+
0.15
"Near end"
Tap Module "A"
HPA-0825
STANDARD RECOMMENDED PROCEDURE 003-126 | ISSUE 1 | OCTOBER 2012 | PAGE 3 OF 9
Multimode Fiber
MTP
50/50
mated pair
splitter
+
0.35
3.8
OM4
Ultra-bendable
optimized 50µm
(850 nm)
Loss, max (dB)
1
0.35
0.15
3.8
6.6 /1.8
0.15 +3.8 + 0.35 +0.35 + 0.15 = 4.8 dB + fiber loss
Note: Fiber loss
depends on length
of system
Single Mode Fiber
Bend-improved
single Mode
(1310 nm)
Loss, max (dB)
1
0.75
0.5
3.6
6.0 / 2.0
LC mated
MTP
mated pair
+
0.35
Pretium EDGE
Module "B"
Table 1
pair
0.15
"Far end"
Figure 4