OPTICAL FIBRE CABLE

Optical Fibre Colouring

Secondary coating line ( Loose Tube Mfg)

s z stranding Line ( multi Tube Structure)

Final Testing : Optical /Mechanical /Environmental

Dispatch

Tandem Sheathing Line(unitube structure/armouring)

OFC Manufacturing process flow

Testing of Optical fibre Cables

• Optical Tests

• Physical parameters

• Mechanical Tests

• Environment Tests

OPTICAL PARAMETERS -ITU-T G 652

PARAMETERS SPECIFICATIONS UNITS

Attenuation at 1310nm < 0.38 dB/km

Attenuation at 1550nm < 0.25 dB/km

Attenuation at 1285- 1330nm

< 0.4 dB/km

Mode field Diameter 8.8-9.8 microns

Point discontinuity < 0.1 dB Cut-off wavelength 1160 – 1310 nm

OPTICAL PARAMETERS -ITU-T G 655

PARAMETERS SPECIFICATIONS

UNITS

Attenuation at 1550nm < 0.25 dB/km

Attenuation at 1625nm < 0.25 dB/km

Attenuation at 1383± 3 nm

< 1.0 dB/km

Mode field Diameter 9.2-10 microns

Point discontinuity at 1550nm

< 0.1 dB

Cut-off wavelength <1260 nm

DISPERSION –ITU-T G 652PARAMETERS SPECIFICATION

SUNITS

1270 -1340nm band

< 5.3 ps/nm.km

1285 -1330nm band

< 3.5 ps/nm.km

1550 nm < 18 ps/nm.km

Slope < 0.092 ps/nmsq.km

Zero Dispersion wavelength

1300 - 1320 nm

PMD at 1310 & 1550

< 0.2 ps/sqrt.km

DISPERSION –ITU-T G 655

PARAMETERS SPECIFICATIONS

UNITS

1530nm >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 SPECIFICATIONS

UNITS

Mode field Concentricity error

< 0.8 microns

Mode field non circularity

< 12 %

Clad Diameter 125 ± 1 microns

Clad non circularity

< 1 % %

Coat Diameter 245±10 microns

Geometrical Parameters –ITU-T G 655

PARAMETERS SPECIFICATIONS

UNITS

Mode field Concentricity error

< 0.5 microns

Mode field non circularity

< 12 %

Clad Diameter 125 ± 1 microns

Clad non circularity

< 1 % %

Coat Diameter 245±10 microns

Mechanical Parameter –ITU-T G 652

PARAMETERS SPECIFICATIONS

UNITS

Proof Test 1 %

Fibre Curl 4 M

Dynamic Fatigue 20

Static Fatigue 20

Stripping Force 1.3 – 9.8 N

Testing of Optical Fibres 1. Mode field diameter 2.   Clad diameter 3.   Clad non circularity / Ovality 4.   Mode field concentricity error 5.   Diameter over primary coated fibre 6.   Attenuation and Spectral attenuation 7.   Chromatic dispersion 8.   Polarization mode dispersion 9.   Cut-Off Wave length 10.  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

MULTITUBE BURIAL CABLEMULTITUBE BURIAL CABLE

UNITUBE BURIAL CABLEUNITUBE BURIAL CABLE

INNER SHEATH (HDPE)INNER SHEATH (HDPE)

OPTICAL FIBRE IN LOOSE TUBEOPTICAL FIBRE IN LOOSE TUBE

STRENGTH MEMBER (GI WIRE)STRENGTH MEMBER (GI WIRE)

OUTER SHEATH (HDPE)OUTER SHEATH (HDPE)CCST ARMOURCCST ARMOUR

INNER SHEATH (HDPE)INNER SHEATH (HDPE)

CENTRAL STRENGTH CENTRAL STRENGTH MEMBER (FRP)MEMBER (FRP)

OPTICAL FIBRE IN OPTICAL FIBRE IN LOOSE TUBELOOSE TUBE

STRENGTH MEMBER(ARAMID YARN)STRENGTH MEMBER(ARAMID YARN)

OUTER SHEATH (NYLON)OUTER SHEATH (NYLON)

FLOODING JELLYFLOODING JELLY

[[Cable DesignsCable Designs]]

MULTITUBE DUCT MULTITUBE DUCT CABLECABLE

OUTER SHEATH (NYLON)OUTER SHEATH (NYLON)

UNITUBE DUCT CABLEUNITUBE DUCT CABLE OUTER SHEATH (NYLON)OUTER SHEATH (NYLON)

STRENGTH MEMBER ( STRENGTH MEMBER ( FRP) FRP) INNER SHEATH (HDPE)INNER SHEATH (HDPE)

OPTICAL FIBREOPTICAL FIBRE

LOOSE TUBELOOSE TUBE

INNER SHEATH (HDPE)INNER SHEATH (HDPE)

WATER SWELLABLE WATER SWELLABLE TAPETAPE

CENTRAL STRENGTH CENTRAL STRENGTH MEMBER (FRP)MEMBER (FRP)

OPTICAL FIBRE IN OPTICAL FIBRE IN LOOSE TUBELOOSE TUBE

[[Cable Designs]Cable Designs]

[Cable Designs][Cable Designs]

Premises Distribution Cable Premises Distribution Cable [PDC][PDC]

OUTER JACKET (LSOH)OUTER JACKET (LSOH)

ARAMID YARNARAMID YARN

OPTICAL FIBRE IN LOOSE OPTICAL FIBRE IN LOOSE TUBETUBE

Optical FibreLoose Tube

Thixotropic jellyFlooding Jelly

FRP Rod

Polyester TapeGFR YarnsRip CordHDPEPA-12

48F METAL FREE OPTICAL FIBRE CABLE

No. of Loose Tubes 6 Nos

No. of Fibres per Loose Tube

8 Nos

Colour of Loose Tubes

Blue , Orange & Natural ( 4 Nos.)

Colour of Fibres in Loose Tube

Blue ,Orange , Green , Brown , Slate , White , Red & Natural

Diameter of Cable 12.6 ± 0.5mm

Weight of Cable 130 kg / km

Packing Length 2 k.m ± 10 %

48F METAL FREE OPTICAL FIBRE CABLE

* : Typical values which may vary as per Customer Spec

12 Fibre RibbonThixotropic JellyLoose TubeFRP RodFlooding Jelly

48 FIBRE DUCT OFC ( RIBBON TYPE )

Polyester TapeRip Cord

HDPE SheathPA-12 Jacket