26
Splicing program structure
Program name
A
The names of FSU 995 FA splicing programs can have no
more than 16 characters, and should be designed for quick
and easy recognition. When a splicing program is displayed,
it will always be with its number, like the pre-defined pro-
grams are:
Fiber type
B
Because of structural differences, different types of fiber
behave in dissimilar ways when spliced. For example,
dopants can change the melting temperatures and light
emissions of heated glass, and fibers are often made with
several differently doped layers. This variation must be taken
into account during the splicing sequence, as well as in
splice loss estimation, so it is important to specify fiber type
when designing your own program. As an aid, the following
decriptions of the major fiber types are given with a listing of
the programming name for that fiber type, as well as, the
number(s) of the pre-defined splicing program(s) that can be
used as a base for designing your own splicing programs.
ADVANCED OPERATION - Splicing program structure: Program name
“
“
NORMAL SM + SM P01
M ATTENUATOR
AN SM + SM
xxxxx xx + xx
NORMAL SM +
ECCENTRIC SM + SM
Erbium doped fiber
ERBIUM DOPED FIBER
Pre-defined programs: 06 & 07
Hot image of single mode fibers
Multimode fiber
MULTI-MODE FIBER
Pre-defined program: 04
Hot image of multimode fibers
Erbium doped fiber is used in amplifiers to increase the inten-
sity of a light signal within an optical network. It achieves this
through a combination of erbium dopants and a smaller than
average core (usually 4
m
m, as opposed to 6-8
m
m). How-
ever, since erbium fiber is usually being spliced to other types
of fiber with larger cores, special techniques must be applied
to make the best match of the dissimilar cores.
Multimode fiber has a larger core that permits the transmission
of several light modes simultaneously, and since it does not
have any mechanisms for dampening dispersion, it is usually
only used in smaller, local networks. On the other hand, its
advantage is that it is relatively easy to splice. If you are ever
not sure whether you have multimode fiber, it is quite easy to
identify it by looking at its distinctive hot image profile.