M90 Fusion Splicer 7-10 Operating Instructions
Troubleshooting and Care/Maintenance Issue 02/97
Splicing single-
mode fibers of
type "Depressed
Inner Cladding"
Problem
When splicing single-mode fibers of type "Depressed Inner Cladding", difficulties may
be encountered if using LID programs. In such instances, the fault message "Bad end-
faces" often appears during Z-positioning even though the cleave appears perfect on
the monitor. In addition, the splice loss may be displayed incorrectly for splices for
which no fault message is produced.
Cause
These problems are not related to the cleaver but to the fact that the index profile of this
special fiber type is disadvantageous for LID input.
Possible solutions
The problems can be easily avoided by inserting the fibers with an excess length be-
tween the LID flaps and the fiber holder flaps so that it forms an arc with a diameter of
around 2 cm. The following figure gives an impression of what this should look like.
There is no need to use this precise diameter or to measure it out. The arc must not be
too weak though. This measure reliably prevents the problem occurring. When standard
single-mode fibers are to be fused, the fibers can be inserted is the usual way. An alter-
native remedy would be to use video programs.
1
2
3
2
3
Inserting Fibers of Type "Depressed Inner Cladding"
1 Fibers with excess
length
2 LID
3 Fiber holder
Fault Appearance Cause Remedy
Splice appear-
ance
Constriction
Dirty electrodes, arc
burning irregularly
Clean electrodes (page 7-29)
Fusion current too high Reduce in steps of 0.2 to 0.3 mA
Feed too small Increase in steps of 1 µm
Prefusion time too long Standard value: 0.20 s, change only
in exceptional cases. Reduce in
steps of 0.05 s.
Prefusion current too
high
Standard value: 14.5 mA, change
only in exceptional cases. Reduce in
steps of 0.1 mA.
Separation too great Reduce separation in steps of 0.5µ
m
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