Ericsson FSU 995 F, Руководство пользователя, Страница: 57 / 86

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Special functions
ADVANCED OPERATION - Special functions: Advanced splicing parameters
Advanced splicing parameters
A
Mode field diameters: LEFT MFD and RIGHT MFD
In order to obtain good splice
loss estimation it is important
to correctly set the mode field
diameters for your fibers. The
mode field diameters are listed
in the specifications for fibers,
and the adjacent table gives
some representational values.
Nevertheless, if possible, it is
also a good idea to test your
fibers by comparing measured
and estimated splice losses
over a series of splices.
Fiber Type 488 633 850 980/1060 1300 1550
Single mode 3.7 4.3 5.7 6.6 9.3 10.5
High NA
Single mode
- 3.3 4.3 5.3 6.6 7.8
Dispersion
Shifted
- - - - - 8.1
Wavelength (nm)
MFD (
m
m)
Arc offset: SET CENTER POSITION
The SET CENTER POSITION parameter
allows you to distribute different energy
levels to left and right fiber during splicing.
This is useful when splicing two different
kinds of fibers requiring different
temperatures for melting.
The value of the parameter represents the
number of pixels from the left to the right end
of the monitor, from 0 to 510 pixels, and the
position where you want the fiber ends to
splice. The default value is 255 pixels. This is
in the absolute center of the monitor and the
position where the energy, or heat, from the
arc is at its maximum. If you use a lower
value than
255 , the right fiber will therefore
have a higher temperature than the left, and
the opposite, if the value is set higher.
Note that the two global parameters GLOBAL XCT and AUTOXCT OFFSET also affects the
position where the fiber ends will splice, that is, the splicing position. The following formula
shows how to calculate the splicing position for the forthcoming splice:
Splicing position = GLOBAL XCT + (SET CENTER POSITION -255) + AUTOXCT OFFSET
Setting the SET CENTER POSITION parameter
0 pixels
Electrode
Fiber
510 pixels
Electromagnetic
field
Monitor
area