M90 Fusion Splicer 5-2 Operating Instructions
Attenuation Splice Issue 02/97
Attenuation Splice with Standard Single-Mode Fibers
If you want to make attenuation splices
with standard single-mode fibers
, you merely
need to read the section "Making an Attenuation Splice" from the next page onwards.
There, you will also find references to further information if you do
not
obtain the re-
quired results.
Description of the Attenuation Splice Program
The attenuation splice program allows you to set the required attenuation over the
range 0 to 10 dB in 0.1 dB steps. This attenuation is then implemented and displayed
fully automatically by a special fusion sequence.
In the case of attenuation splices,
no tension testing
of the finished splice is per-
formed.
Fiber Types that can be Used
Since the attenuation obtained is checked by means of the LID system, certain restric-
tions apply with regard to the fibers used:
- The attenuation splices can only be made between
single-mode fibers.
The proc-
ess is not suitable for making attenuation splices between multimode fibers.
- The fibers used must be
LID-compatible,
i.e. the nominal coating diameter must be
250 µm and the coating must be transparent at a wavelength of 1300 nm.
- The best results are achieved with
standard single-mode fibers
. The parameters
may need to be modified if other fiber types are used.
- With the "
depressed inner cladding
" type of fiber an excess fiber length must be
left between the fiber holders and the LID flaps for correct attenuation measurement
as well as for normal splicing (see section 2). It is then possible to make attenuation
splices with this fiber type also. For these fibers, refer to the notes in section
Pa-
rameter Recommendations
.
- Attenuation splices are also possible between
dispersion-shifted single-mode
fibers
if appropriate
parameter settings
are used and provided the LID level is not
too low. It has to be noted that the attenuation measurement in the fusion splicer is
performed at 1300 nm, i.e. beyond the single-mode operating wavelength of disper-
sion-shifted fibers. The actual attenuation of the attenuation splices at both 1300 nm
and 1550 nm may thus deviate from the display value by more than the error limits
set out in the
Technical Specifications
. If you wish to form attenuation splices be-
tween dispersion-shifted fibers, it is therefore advisable to carry out tests first,
measuring the attenuation actually obtained for the wavelength of interest. The inac-
curacy can be compensated in part by entering a suitably corrected required value
so that the actual splice attenuation then corresponds to the required value.
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