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The difference between single mode and multi mode
The light is reflected in a zigzag pattern in the core of thicker multi-
mode fiber cables. This results in higher attenuation, the range of
the signal reduces, in other words. The light does not refract so
frequently in single mode fiber cables and guarantees an enor -
mous range.
Cladding
There are several forms of cladding for glass fiber cables.
Solid strand type Hollow strand type Combined strand type
The solid strand type surrounds the fiber directly. This has a disad -
vantageous effect when there is high strain and with temperature
differences.
Unlike the solid strand type, the hollow strand type does not
surround the fiber directly. There is a hollow space between the
cladding and the fiber which reduces the disadvantageous effects
of strain load and temperature differences.
Kabeltyp
A Outside cable
I/J Inside cable
U optoversal ? cable (not VDE)
Ader
V Solid strand
D Bundled strand
W Hollow strand, filled
H Hollow strand, unfilled
M Mini bundle (not VDE)
The combined strand type represents an intermediate form of the
solid core type and the hollow core type. The hollow space of the
cladding is filled here with a gel or similar.
Use of the individual glass fiber cables
Multi fire cables are usually found in cabling in buildings and in
short and medium distance runs. OM2 fiber cables are used the
most. OM3 fibers of better quality are used more and more fre -
quently and replace OM2 fiber cables over the long run.
Single mode fiber cables are used because of their good signal
properties in long distance cabling.
LWL plugs
The widest distributed LWL plugs are ST-, SC- and LC plugs. The LC
plugs gains an ever increasing share of the market for glass fiber
plugs because of the compact size and their use with mini GBIC
modules in switches or media converters.
Pigtails
Pigtails are cables equipped with an LWL plug on one side and a
plain glass fiber cable on the other side. They are used at the end
points of laid cables and are spliced with each other.
Splicing
Splicing is understood to be the connection of two glass fiber
cables. These are adjusted at their end points and permanently
fused together.
Uniform, abbreviated descriptions exist for LWL
cables in accordance with DIN-VDE Norm 0888
which consist of a series of number, as can be
seen in the table.
S
Metallic distribution element
F
Q
Filling compound for filling the cord cavities in the cable core
Source element (not VDE)
1. Outside cladding
H LSOH cladding
Y PVC cladding
2Y PE cladding
(ZN)2Y PE cladding with non-metallic strain relief elements
(ZN)(L)2Y PE laminated cladding with non-metallic strain relief elements
(ZN)(SR)2Y Steel spiral laminated cladding with non-metallic strain relief elements
2. Outside cladding
B Reinforcement
BY Reinforcement with PVC protective cover
B2Y Reinforcement with PE protective cover
Number of fibers
Number of bundled fibers x number of fibers per fiber bundle
1
2
3
4
5
6
7
8
9
10 11 12 13 14
Construction
LG stranding in layers
Bandwidth in MHz for 1 km
(Multimode fibers)
Dispersion in ps/nm x km
(Single mode fibers)
Wavelengths
B 850nm
F 1300nm
F 1310nm
H 1550nm
Attenuation coefficient in dB/km
Cladding diameter in μm (125μm)
Field diameter in μm for single mode fibers (9μm)
Core diameter in μm for multi mode fibers
(50μm or 62.5μm)
(multimode fibers)
(multimode fibers)
(single mode fibers)
(single mode fibers)
 4
Subject to alterations.
Construction type
E Single mode fiber
G Multimode fiber
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