China top 3 air-blown micro fiber optic cable supplier, GL has more than 17 years experience, Today, we will introduce a specal fiber optic cable SFU (Smooth Fibre Unit ).
The Smooth Fibre Unit (SFU) consists of a bundle of low bend radius, no waterpeak G.657.A1 fibres, encapsuled by a dry acrylate layer and protected by a smooth, slightly ribbed polyethylene outersheath, for application in the access network. Installation: blowing into microducts of 3.5mm. or 4.0mm. (inside diameter).
1. General
1.1 This specification covers the requirements for the supply of single-mode optical fiber cables.
1.2 The single mode optical fiber cable comply with the requirements of this specification and generally meet any latest relevant ITU-T Recommendation G.657A1
2. Fiber characteristics
2.1 G.657A
2.1.1 Geometric characteristics
Technical Datas:
Attenuation (dB/km) |
@1310nm | ≤0.34dB/km |
|
@1383nm | ≤0.32dB/km |
|
@1550nm | ≤0.20dB/km |
|
@1625nm | ≤0.24dB/km |
Dispersion | @1550nm | ≤18ps/(nm.km) |
@1625nm | ≤22ps/(nm.km) | |
Zero-Dispersion wavelength | 1302-1322nm | |
Zero-Dispersion slope | 0.089ps(nm2.km) | |
Mode field diameter @1310nm | 8.6±0.4um | |
Mode field diameter @1550nm | 9.8±0.8um | |
PMD Max.value for fiber on the reel Max.designed value for link | 0.2ps/km 1/20.08ps/km 1/2 | |
Cable cutoff wavelength,λcc | ≤1260nm | |
Geometrical Characteristics | ||
Cladding diameter | 124.8±0.7 um | |
Cladding non-circularity | ≤0.7% | |
Core/Cladding Concentricity error | ≤0.5um | |
Fiber diameter with coating (uncolored) | 245±5um | |
Cladding/Coating concentricity error | ≤12.0um | |
Curl | ≥4m | |
Mechanical characteristics | ||
Proof test | ≥0.69Gpa | |
Macro-bend loss at 1550nm Ø20mm,1 turn | ≤0.25dB | |
Ø30mm,10 turn | ≤0.75dB | |
Macro-bend loss at 1625nm Ø20mm,1 turn | ≤1.5 dB | |
Ø30mm,10turn | ≤1.0dB | |
Environmental characteristics @1310nm & 1550nm | ||
Temperature induced attenuation (-60℃~+85℃) | ≤0.05dB | |
Dry heat indeced attenuation(85℃±2℃,RH85%,30 days) | ≤0.05dB | |
Water immersion indeced attenuation (23℃±2℃,30 days) | ≤0.05dB | |
Damp heat indeced attenuation(85℃±2℃,RH85%,30dyas) | ≤0.05dB/km |
3 Optical Fiber Cable
3.1 Cross section
Fiber optic | Type | Single mode G657A1 2-12 |
Diameter of cable | mm | 1.1-1.2 |
Weight of cable | (kg/km) | 2.2±20% |
Lifetime | years | ≥ 25 |
Allow Tensile Strength | Long term : | 20N |
Crush strength | Short Term: | 100N/100mm |
Min Bending raduis | Operation | 20 OD |
Laying | 15 OD | |
Temperature range | Laying | -10~+60 ℃ |
Transporation & operation | -20~+70 ℃ |
3.3 Performance
NO | ITEM | TEST METHOD | SPECIFICATION |
1 |
Tensile performance IEC60794-1-21-E1 |
-Short-term load:20N - Time: 5 minute | Loss change £ 0.10 dB@1550 nm (after test)- Fiber strain £ 0.60 %- No sheath damage |
2 |
Crush test IEC60794-1-21-E3 |
- Load: 100 N /100mm- Time: 5 minute- Length: 100 mm | Loss change £ 0.10 dB@1550 nm(during test)- No sheath damage |
3 |
Repeated bending IEC60794-1-21-E6 |
- Bending radius.: 20 × D- Load: 25N- Flexing rate: 2sec/cycle- No. of cycle: 25 | - No fiber break- No sheath damage |
4 |
Water penetration IEC60794-1-22-F5 |
- Height of water: 1m- Sample length: 3 m- Time: 24 hr | - No drip through the cable core assembly |
5 |
Twist IEC60794-1-21-E7 |
- Length: 1 m- Load: 40N- Twist rate: ≤60sec/cycle- Twist angle: ±180°- No. of cycle: 5 | Loss change £ 0.10 dB@1550 nm(during test)- No sheath damage |
6 |
Temperature Cycling IEC60794-1-22-F1 |
- Temperature step:+20oC→-20oC→+70oC→+20oC- Number of cycle: 2 turns- Time per each step: 12 hrs | - Loss change £ 0.15dB/km@1550 nm (during test)- Loss change £ 0.05dB/km@1550 nm (after test)- No sheath damage |
4. Sheath marking
5,Package And Drum
The cables are packed in carton, coiled on Bakelite & Fumigated wooden drum. During transportation, right tools should be used to avoid damaging the package and to handle with ease. Cables should be protected from moisture; kept away from high temperature and fire sparks; protected from over bending and crushing; protected from mechanical stress and damage.
Packing length :2000-5000m/reel.