Optical data cable BI 9/125 U25 A2

for telecom applicationssingle-mode

Product description
Designed for installations with limited routing space and demanding mechanical conditions, this bend-insensitive single-mode fiber provides stable transmission under tight bends and dynamic stress. YOEC's fiber design combines a tailored refractive profile and advanced coating to minimize bending-induced attenuation while maintaining required geometrical and mechanical tolerances.

Application
Suitable for guided systems and assemblies where routing requires small bend radii or repeated flexing. Typical uses include fiber-optic sensing components, specialty optical devices, and cables routed through confined or moving structures.

Features

• Low bending-induced loss: engineered to limit attenuation in small bend radii and tight routing scenarios.
• Mechanical reliability: optimized materials and structure for improved tensile strength and fatigue resistance under stress and vibration.
• Standards compatibility: compliant with ITU-T G.657.A2 for integration with existing single-mode infrastructures.

Typical specifications
Item — Unit — Specification
Product Model — / — BI 9/125 U25 A2

Optical characteristics
Operating Wavelength — nm — 1310 / 1550
Attenuation @1310 nm — dB/km — ≤ 0.40
Attenuation @1550 nm — dB/km — ≤ 0.25
Attenuation @1625 nm — dB/km — ≤ 0.25
Mode Field Diameter (1310 nm) — μm — 8.4 – 9.2
Cable Cut-off Wavelength — nm — ≤ 1260
Zero Dispersion Wavelength — nm — 1300 – 1324
Zero Dispersion Slope — ps/(nm²·km) — ≤ 0.092
PMD Coefficient — ps/√km — ≤ 0.2

Geometrical characteristics
Core/Cladding Concentricity — μm — ≤ 0.5
Cladding Diameter — μm — 124.5 ± 0.5
Cladding Non-Circularity — % — ≤ 1.0
Coating Diameter — μm — 245.0 ± 7.0
Cladding/Coating Concentricity — μm — ≤ 12.5
Coating Non-Circularity — % — ≤ 6.0

Macrobending loss
10 turns @ 15 mm radius — dB @1550 nm — ≤ 0.03
10 turns @ 15 mm radius — dB @1625 nm — ≤ 0.10
1 turn @ 10 mm radius — dB @1550 nm — ≤ 0.10
1 turn @ 10 mm radius — dB @1625 nm — ≤ 0.20
1 turn @ 7.5 mm radius — dB @1550 nm — ≤ 0.30
1 turn @ 7.5 mm radius — dB @1625 nm — ≤ 0.50

Mechanical properties
Curl Radius — m — ≥ 4
Coating Strip Force (Average) — N — 1.0 – 5.0
Coating Strip Force (Peak) — N — 1.0 – 8.9
Tensile Strength (0.5 m Gauge Length) — GPa — ≥ 3.8
Dynamic Fatigue Parameter — - — ≥ 22
Proof Test Level — kpsi — 100 (Optional: 150 / 200)

Environmental characteristics (1550 nm / 1625 nm)
Temperature Cycling — -60°C ~ +85°C — ≤ 0.05 / 0.05 dB/km
Damp Heat — 85°C, 30 days — ≤ 0.05 / 0.05 dB/km
Temperature & Humidity Cycling — 10°C ~ 85°C, RH 4%–98% — ≤ 0.05 / 0.05 dB/km
Dry Heat — 85°C, 30 days — ≤ 0.05 / 0.05 dB/km
Water Immersion — 23°C, 30 days — ≤ 0.05 / 0.05 dB/km

FAQ

• What is bend-insensitive single-mode fiber? — A fiber engineered to keep bending-induced attenuation low so signal transmission remains stable in tight or complex routing.
• How does it differ from standard single-mode fiber? — It reduces losses caused by tight bends and performs better where routing and space constraints are critical.
• Is this fiber compatible with existing systems? — Yes. It complies with ITU-T G.657.A2 for compatibility with common single-mode infrastructures.
• What are the main advantages? — Low bending loss, predictable transmission under stress, and enhanced mechanical durability for long-term operation.

Technical summary

• Model: BI 9/125 U25 A2
• Operating wavelengths: 1310 nm, 1550 nm
• Attenuation: ≤ 0.40 dB/km @1310 nm; ≤ 0.25 dB/km @1550 and @1625 nm
• Mode field diameter (1310 nm): 8.4 – 9.2 μm
• Compliance: ITU-T G.657.A2
• Cladding diameter: 124.5 ± 0.5 μm; Coating diameter: 245.0 ± 7.0 μm
• Macrobending: ≤ 0.03 dB (10 turns @15 mm, 1550 nm)
• Curl radius: ≥ 4 m
• Tensile strength: ≥ 3.8 GPa (0.5 m gauge)
• Proof test: 100 kpsi (optional 150/200)
• Environmental stability: ≤ 0.05 dB/km under thermal, humidity and immersion tests