THORLABS Vytran LDC401, Руководство пользователя

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LDC401 & LDC401A Automated Cleavers Chapter 10: Accessories
Page 50 TTN100064-D02
Example: For the Ø800 µm example fiber from step 1, the green cell is in the 750 µm groove column for
the VHA05 Top Insert which has two grooves. The numbers listed in the green cell indicate that this
combination of Inserts is good for fibers from 728 to 963 µm in diameter. Our Ø800 µm fiber is within this
range, so this is a good choice. There are several other options as well that will accommodate an Ø800 µm
fiber as well, but the green shading in the chart indicates that the 750 µm groove in the VHA05 provides
the best fit.
3. The second line of numbers in each cell shows the range of offsets that can be expected for any
given combination of top and Bottom Inserts. When selecting Inserts for the right and left Fiber
Holding Blocks, try to minimize the offsets between the pairs of Inserts on each side.
Example:
If we choose a VHD750 Bottom Insert and the Ø750 µm groove in the VHA05 Top Insert, we
can use fiber as small as 728 µm, in which case the center of the fiber would sit 23 µm below the surface
of the Bottom Insert. We could also clamp a fiber as large as 963 µm, in which case the center of the fiber
would sit 213 µm above the surface of the Bottom Insert. We could interpolate to find the offset experienced
by our hypothetical 800 µm fiber, but it turns out that in a 60° V-groove, the offset is equal to the diameter
difference. So in our example, that means that the center of our fiber is going to sit 50 µm above the Bottom
Insert surface, since it is 50 µm larger than the fiber that the Bottom Insert was designed for (800 - 750 =
50).
4. Holding blocks designed for fibers less than Ø1000 µm have vacuum holes, designed to aid in
aligning small fiber within the groove, while Bottom Inserts for fibers of Ø1000 µm or larger do not
have these holes.
The LDC401 and LDC401A each have a Vacuum Pump that provides a small holding force via these holes,
keeping small fibers in place as the clamps are lowered. Inserts with vacuum holes are indicated by a
superscript "b" in the Fiber Holder Insert Selection Chart.
VHT1 Transfer Clamp and Graphite V-Grooves
The Fiber Holder Transfer Bottom Inserts are designed to be used with the VHT1 Transfer Clamp to allow small
fibers to be easily transferred between compatible Vytran systems while maintaining rough alignment of the fiber
tip location relative to the edges of the Fiber Holding Blocks. Compatible systems are:

LDC401 Cleaving Stations

FPS300 Cleaning and Stripping Station

LFS4100 Splicer

GPX3400 and GPX3600 Glass Fiber Processing Stations
The LFS4100 splicer and GPX series of glass processing stations require extra support for the fiber tips close to
the heating filament for fibers with cladding diameters
≤ 550 µm. For this purpose, Thorlabs offers graphite tips with
V-grooves that can be installed in the transfer Inserts. Available graphite tips are outlined in the table below.
Item # Accepted Diameter (Min / Max)
VHG125L 80 µm / 125 µm
VHG200 150 µm / 200 µm
VHG250 200 µm / 250 µm
VHG300 250 µm / 300 µm
VHG350 300 µm / 350 µm
VHG400 350 µm / 400 µm
VHG450 400 µm / 450 µm
VHG500 450 µm / 500 µm
VHG550 500 µm / 550 µm