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OPTICAL FIBRE CABLE
OFC Manufacturing process flow
Optical Fibre Colouring
Secondary coating line ( Loose Tube Mfg)
s z stranding Line ( multi Tube Structure)
Tandem Sheathing Line(unitube structure/armouring)
Final Testing : Optical /Mechanical /Environmental
Dispatch
Testing of Optical fibre Cables
• Optical Tests
• Physical parameters
• Mechanical Tests
• Environment Tests
OPTICAL PARAMETERS -ITU-T G 652
PARAMETERS
SPECIFICATIONS
Attenuation at 1310nm < 0.38
UNIT
S
dB/km
Attenuation at 1550nm
< 0.25
dB/km
Attenuation at 12851330nm
Mode field Diameter
< 0.4
dB/km
8.8-9.8
micron
s
dB
nm
Point discontinuity
Cut-off wavelength
< 0.1
1160 – 1310
OPTICAL PARAMETERS -ITU-T G 655
PARAMETERS
SPECIFICATION
S
Attenuation at 1550nm < 0.25
UNITS
Attenuation at 1625nm < 0.25
dB/km
Attenuation at 1383± < 1.0
3 nm
Mode field Diameter 9.2-10
dB/km
Point discontinuity at
1550nm
Cut-off wavelength
< 0.1
dB
<1260
nm
dB/km
microns
DISPERSION –ITU-T G 652
PARAMETERS
1270 -1340nm
band
1285 -1330nm
band
SPECIFICATION UNITS
S
< 5.3
ps/nm.km
< 3.5
ps/nm.km
1550 nm
< 18
ps/nm.km
Slope
< 0.092
ps/nmsq.km
Zero Dispersion
wavelength
PMD at 1310 &
1550
1300 - 1320
nm
< 0.2
ps/sqrt.km
DISPERSION –ITU-T G 655
PARAMETERS
1530nm
SPECIFICATION UNITS
S
>0.1
ps/nm.km
1565nm
4-6
ps/nm.km
1565 - 1625 nm
4 – 11.2
ps/nm.km
Slope
< 0.08
ps/nmsq.km
PMD at 1550
< 0.2
ps/sqrt.km
Geometrical Parameters –ITU-T G 652
PARAMETERS
SPECIFICATION
S
UNITS
Mode field
< 0.8
Concentricity error
microns
Mode field non
circularity
Clad Diameter
< 12
%
125 ± 1
microns
Clad non
circularity
Coat Diameter
<1%
%
245±10
microns
Geometrical Parameters –ITU-T G 655
PARAMETERS
SPECIFICATION UNITS
S
Mode field
Concentricity
error
Mode field non
circularity
Clad Diameter
< 0.5
microns
< 12
%
125 ± 1
microns
Clad non
circularity
Coat Diameter
<1%
%
245±10
microns
Mechanical Parameter –ITU-T G 652
PARAMETERS
Proof Test
SPECIFICATION UNITS
S
1
%
Fibre Curl
4
Dynamic Fatigue
20
Static Fatigue
20
Stripping Force
1.3 – 9.8
M
N
Testing of Optical Fibres
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Mode field diameter
Clad diameter
Clad non circularity / Ovality
Mode field concentricity error
Diameter over primary coated fibre
Attenuation and Spectral attenuation
Chromatic dispersion
Polarization mode dispersion
Cut-Off Wave length
Microbend test on mandrel
Mechanical Test - I OFC
•
•
•
•
•
•
•
•
Tensile Strength Test
Abrasion Test
Crush Test
Impact Test
Repeated Bend Test
Torsion Test
Kink Test
Cable Bend Test
Mechanical Test –II OFC
•
Static bend
•
Water Penetration Test
•
Drip Test
•
Embrittlement Test of loose tube
•
Kink resistance test on loose tube
•
Drainage test of loose tube
•
Check for easy removal of sheath
•
Effect of aggressive media on the cable jacket
•
Flexural Rigidity
•
Figure “8” test
Physical & Environmental Test - OFC
•
Sheath Thickness
•
Cable Diameter
•
Cable performance from –40 to + 70 deg C
Optical Test - OFC
•
Attenuation at 1310nm
• Attenuation at 1550nm
• Attenuation at 1625nm for ITU-T G 652 Fibre
• Point discontinuity at 1550nm
• Optical Length of cable
• PMD of cables fibre
• Chromatic dispersion
CABLE CONSTRUCTIONS
[Cable Designs]
UNITUBE BURIAL CABLE
OUTER SHEATH (NYLON)
STRENGTH MEMBER(ARAMID YARN)
INNER SHEATH (HDPE)
OPTICAL FIBRE IN LOOSE TUBE
STRENGTH MEMBER (GI WIRE)
MULTITUBE BURIAL CABLE
OUTER SHEATH (HDPE)
CCST ARMOUR
INNER SHEATH (HDPE)
FLOODING JELLY
CENTRAL STRENGTH
MEMBER (FRP)
OPTICAL FIBRE IN
LOOSE TUBE
[Cable Designs]
UNITUBE DUCT CABLE
OUTER SHEATH (NYLON)
STRENGTH MEMBER (
FRP)
INNER SHEATH (HDPE)
OPTICAL FIBRE
LOOSE TUBE
MULTITUBE DUCT
CABLE
OUTER SHEATH (NYLON)
INNER SHEATH (HDPE)
WATER SWELLABLE
TAPE
CENTRAL STRENGTH
MEMBER (FRP)
OPTICAL FIBRE IN
LOOSE TUBE
[Cable Designs]
Premises Distribution Cable
[PDC]
OUTER JACKET (LSOH)
OPTICAL FIBRE IN LOOSE
TUBE
ARAMID YARN
48F METAL FREE OPTICAL FIBRE CABLE
Optical Fibre
Loose Tube
FRP Rod
Thixotropic jelly
Flooding Jelly
Polyester Tape
GFR Yarns
Rip Cord
HDPE
PA-12
48F METAL FREE OPTICAL FIBRE CABLE
No. of Loose Tubes
6 Nos
No. of Fibres per
Loose Tube
Colour of Loose
Tubes
Colour of Fibres in
Loose Tube
8 Nos
Diameter of Cable
12.6 ± 0.5mm
Weight of Cable
130 kg / km
Packing Length
2 k.m ± 10 %
Blue , Orange & Natural ( 4 Nos.)
Blue ,Orange , Green , Brown ,
Slate , White , Red & Natural
* : Typical values which may vary as per Customer Spec
48 FIBRE DUCT OFC ( RIBBON TYPE )
12 Fibre Ribbon
Thixotropic Jelly
Loose Tube
FRP Rod
Flooding Jelly
Polyester Tape
Rip Cord
HDPE Sheath
PA-12 Jacket
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