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25
2>
Enter splice program the menu of arc parameter, and check the value of arc
current.
3>
translation motion
（
decrease or increase
）
current (premelting current, splicing
current).
4>
Press “ENT” to save after confirming.
5>
Press “MENU” to exit menu.
11> When splicing the MM fiber, there is bubble in the process of arc.
Solutions: The difference between fiber’s core and envelope’s refractive index
is too big. Operations as follows:
1>
Consult MM fiber’s arc program set by factory (the value of “Fusion
program” is less than 5) and confirm.
2>
Do arc test until “Moderate current” is displayed three times.
3>
Splice MM fiber; if there is bubble then modify arc parameter.
Operations are as follows:
1)
Enter the menu of arc parameter.
2)
Increase 1 step size( 10m/s)to the value of “Pre-fusion time”.
3)
Splice fiber; increase the value of “Pre-fusion time” until no bubble.
4)
Decrease the value of “Pre-fusion current” if no bubble and fiber thins.
13 Addenda B Explanations about arc test
It is necessary to select proper arc fusion program if you want to obtain low
fusion loss. Fusion splicer can modify arc current and arc position automatically.
Basic theory:
The gap position of fiber’s surface before arc is L0 and L1,
The gap position of fiber’s surface after arc is L2 and L3. The formula is as follows:
Δ L = (L3
-
L2)
–
(L1-
L0)
Base on the value of “ΔL”, you can modify the quality of arc current.
The shrinking value of left fiber “ΔL” is gotten from following formula:
ΔL1 = L2 –
L0
The shrinking value of right fiber “ΔL” is gotten from following formula:
ΔL2 = L3 –
L1
Base on the value of ΔL1 and ΔL2, you can modify gap position to fit the
change of arc position.
arc
L0 L2
L1 L3
(a) (b) (c)