Operating Instructions 7-3 M90 Fusion Splicer
Issue 02/97 Troubleshooting and Care/Maintenance
General rules The following rules apply to practically all single-mode fibers. Deviations from these
rules are required only for very few special fibers in the event, for instance, of blistering.
If seeding occurs in splices, follow the notes on fusing multimode fibers further on in this
section. The remedial measures described there are also suitable for single-mode fi-
bers.
- For separation, fiber feed and prefusion time always use the default parameters.
- Prefusion current and fusion current are always set at the same level.
This leaves only the current (for prefusion and fusion) as the parameters to be opti-
mized.
Fusion current
and fusion time
Fusion current and fusion time have, over a certain range, the same effect on the result-
ing fusion. Increasing the current has about the same effect as extending the time, i.e.
different current/time combinations produce the same results.
"Automatic fusion
time control"
For the first trial, set the default parameters for fusion current and minimum and maxi-
mum fusion time and make several splices.
The fusion current is correctly set when the resultant fusion time is on average between
1.5 and 5 s. A shorter fusion time indicates that the fusion current is set too high, while
longer times indicate that the current is too low.
Correct the current (fusion current and prefusion current) in steps of 0.5 mA until the
fusion time is in the stated range.
Note
When automatic fusion time control is used and the fusion time obtained is frequently
only slightly longer than the set minimum fusion time despite reducing the fusion cur-
rent, this may be due to incorrect prefusion parameters or too short a minimum fusion
time.
For fine optimization, measure the attenuation if possible with an external attenuation
test set. With suitable splice parameters and identical single-mode fibers of good qual-
ity, the attenuation obtained must be on average significantly below 0.1 dB. If this value
is not reached, although the fusion time is in the stated range, it may then be necessary
to adjust the prefusion parameters slightly.
"Fixed parameters
(LID)"
Carry out the parameter optimization in the program "Automatic fusion time control" as
described in the previous section. Then set the same currents in the program with fixed
parameters. As fusion time use the average of the fusion times resulting from 10
splices.
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