Cables for Installations and Industry - Draka

TYPE COD ING OF OP TI CAL FI BRE
CA BLES
An ex am ple of the ca ble des ig na tion
Cable construction
Number and grouping of the fibres
Type of the fibre and the coating
Characteristics of the fibres
Ca ble con struc tion
First let ter:
F = op ti cal fi bre ca ble
FYOVD2PMU 4 x 6 x SML 04S03T
Sec ond let ter:
Y = sin gle loose tube con struc tion (SPI RAL SPACE ® )
Z = stranded loose tube con struc tion
T = stranded tight buffer con struc tion
X = slot ted core con struc tion
Next let ters:
B = laminated O = filling compound
C = copper P = round steel wire
D = corrugated R = nonmetallic
H = metal (aluminium) strength member
tape V = steel tape
J = jute S = indoor installation
K = messenger U = outdoor installation
wire
L = lead
M = plastic W = submarine
-Y = combination cable (the last letter)
Ex am ple: FYOVD2PMU (op ti cal fi bre ca ble,
SPI RAL SPACE ® de sign, jelly filled, cor ru gated steel tape,
plas tic sheath with two steel wires, for out door in stal la tion)
Num ber and group ing of the fi bres
The num bers fol low ing the let ter code in di cate the number
of the fi bre groups (i.e. tubes or bun dles) and the number
of the fi bres in each group.
Ex am ple: 4x6 (four groups of six fi bres)
Type of the fi bre and its coat ing
The first two let ters of the code in di cate the type of the
fi bre:
SM = Single- mode fi bre (10/125 µm) ITU-T G.652
GI = Mul ti mode fi bre (50/125 µm) ITU-T G.651
GK = Mul ti mode fi bre (62.5/125 µm)
GL = Mul ti mode fi bre (85/125 µm)
GN = Mul ti mode fi bre (100/140 µm)
The third let ter in di cates the outer di ame ter or the type of
the coat ing
L = 250 µm T = 900 µm
W = 500 µm R = Rib bon
Ex am ple: MSL
(Single- mode fi bre ITU-T G.652 with 250 µm coat ing)
GENERAL
Char ac ter is tics of the fi bres
The at tenua tion of the fi bre is given in tenths of deci bels
per kilo me tre with two num bers fol lowed by the let ter
in di cat ing the cor re spond ing wave length:
F =850 nm, S =1300 nm, T = 550 nm
Ex am ple: 04S03T
(0.4 dB/km at 1300 nm: 0.3 dB/km at 1550 nm)
For mul ti mode fi bres also the band width is given in
hun dreds of MHz km with two fig ures fol low ing the
at tenua tion value.
Ex am ple: 1008S (1.0 dB/km, 800 Mhz km at 300 nm)
COL OUR COD ING SYS TEM OF
OP TI CAL FI BRE CA BLES
A col our cod ing sys tem is used for iden ti fi ca tion of op ti cal
fi bres, fi bre groups and tubes. A fi bre group has nor mally
not more than 6 fi bres, which are col oured as fol lows:
— blue (al ways the first one)
— white
— yel low
— green
— grey
— red (al ways the last one)
The same col our cod ing sys tem is adapted to the bind ers
over the fi bre bun dles.
OPTICAL FIBRE TYPES
Core Cladding
Primary coating
The construction and the operation principle of a single-mode
fibre
Core Cladding
Primary coating
The construction and the operation principle of a multimode
fibre
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