THORLABS vytran GPX3800, Руководство пользователя

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GPX3800 and GPX3850 Glass Processors Chapter 5: Operation
Rev B, July 24, 2018 Page 29
5.5.2. Filament Normalization
Before using a new filament, when starting the equipment, or after a long period of inactivity, it is necessary to
perform the filament normalization process. Doing so will adjust some parameters to ensure a high quality splice.
Two key control parameters are the “view to splice distance” (centers the filament between the fibers) and the
“power offset” (ensures the furnace operates at same temperature). Before starting the Normalization process, be
sure the filament is properly centered. (See Section 7.4.2 Filament Centering Procedure)
In the filament normalization process, the fibers are heated without any push. The result is that both fiber ends are
burned back (as seen in Figure 10). The software then measures the level of regression of both fibers and
compares it with a predefined value. A change of both the “view to splice distance” and the filament “power offset”
values will be suggested; the user can choose to accept or deny these changes. If the normalization process is
not successful (defined as regression values not within 90% - 110% of the target value; the process will display a
window message that the normalization has not converged and another attempt is needed. In the event of a
successful normalization (regression values within 90% - 110% of the target value), the system will display the
message window saying normalization is successful and unit is ready for use.
To run a normalization process, the user needs to prepare two cleaved fibers for splicing. For FTAV2 filament
normalization, SMF-28 fiber (Item # SMF-28-J9) should be used with the V2 normalization file provided with the
glass processor. For FTAV4 filament normalization, Nufern Ø20 µm core / Ø400 µm cladding passive fiber should
be used with the V4 normalization file provided with the glass processor.
Figure 10 Filament Normalization
5.5.3. Edge Alignment
The edge alignment method aligns the edges of the fibers in the XY direction when the fibers are in the front view
and back view positions. The fibers should be set to the pre-gap distance. This gap allows for individual fiber
movement and ensures proper identification of the fiber edges. The software uses the image data acquired by the
CCD camera to precisely determine the location of the fibers. This positional information is then used to align the
fibers by moving the stepper motor positioners. Successive images are analyzed and the fibers repositioned until
they are aligned.