Koheras HARMONIK
Fiber Coupler Installation Guide
5
Step 6: Adjust the focus
a
While monitoring the power meter, rotate the eccentric key until
the maximum signal is attained.
b
Iteratively repeat steps “5g” (tilt optimization) and “6a” (focus
optimization) until the maximum signal cannot be increased
further.
c
Tighten the two grub screws holding the collimator lens.
Step 7: Adjust the fine tilt
a
Once more, check if you can enhance coupling efficiency by using
the three tilt adjustment screws.
b
Finally, lock the tilt adjustment by tightening the three tilt locking
screws. Besides their locking function, the tilt locking screws can
also adjust the fine tilt.
c
While tightening the first two tilt locking screws, the power meter
signal typically drops significantly. However, when tightening the
third screw, the maximum signal should recover.
Step 8: Final check
a
While observing the fiber output power, gently press against the
cladding stripper of the fiber from the side.
b
When pressing against the cladding stripper in different directions,
the signal normally drops.
c
Release the cladding, the signal should recover to its maximum
value.
d
In case the signal increases while pressing against the connector
in a specific direction, the adjustment is not at its optimum. The
corresponding locking screw has to be fine tuned further, until the
fiber output power decreases symmetrically in each push
direction.
c
“grub screws”
“tilt locking screws”
“cladding”
