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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