X75 Fusion Splicer
Parameters and Programs
Operating Instructions
revision: 06/01
3-21
Optimizing Parameters for Multimode Fibers
NOTE
The parameters can only be optimized if the electrodes are in flawless condition.
In the case of multimode fibers, the optimization of parameters with respect to attenuation
is largely non-critical. As opposed to single-mode fibers, it can be assumed that splice
attenuation is always good, if the splice demonstrates good visual characteristics. An
attenuation measuring instrument is thus not required for optimization.
With multimode fibers, pre-fusion current is generally lower than fusion current. Pre-fusion
time is also longer than for single-mode fibers.
The following problems may occur during fusion:
Symptom
Possible Cause
Remedy
Bubble Formation The splice is severely enlarged
and irregular. The splice
breaks extremely easily. This
problem occurs mainly with
fibers with a high core refrac-
tive index (e.g. 50
µ
m core
diameter).
Increase pre-fusion time in steps of
0.1 s. At the same time, reduce pre-
fusion current in steps of 0.5 mA. If
this is not sufficient, reduce fusion
current in steps of 0.5 mA.
Incompletely
Fused Splices
The bright line in the center of
the fiber is interrupted at the
splice.
If you are able to obtain an improve-
ment by means of re-fusing, increase
fusion time, otherwise increase
fusion current.
Содержание X75 8000 Series
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