Optical Power Loss Through Splicing
If a fiber cable breaks, it is usually repaired by splicing the broken ends together. Two types of splice are
normally used: mechanical and fusion. A fusion splice results in lower power loss, but requires expensive
equipment. A mechanical splice is simple to perform on site when fusion splicing is not available.
If you repair a broken cable using either type of splice, make sure that the power loss in the cable does
not exceed the value for "Maximum Power that can be Received" in Table 11 and Table 12 on
page 201. Table 14 shows the average power loss for each splice type according to cable size.
When calculating the total power loss for ATM connections in your network, you should use the Maximum
Loss values whenever possible as a "worst case" scenario. If a Maximum Loss value is not given for a
certain splice type and cable size, use the Average Loss value.
Table 14. Optical Power Loss per Splice
Splice Type
Cable Size (microns)
Maximum
Loss (dB)
Average Loss (dB)
Mechanical
62.5 to 62.5
—
0.15
50 to 50
—
0.15
100 to 100
—
0.15
9 to 9
—
0.15
Fusion
62.5 to 62.5
1.0
0.4
50 to 50
1.0
0.4
100 to 100
1.0
0.4
9 to 9
1.0
0.4
Appendix B. Cables, Pins and Connectors
203
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