Bending Insensitive Single-Mode Fiber (G.657.A2)
Overview
G.657.A2 is an ultra bend-insensitive single-mode optical fiber designed for flexible routing and dense network environments. It delivers exceptional performance in tight installation spaces such as building risers, micro-ducts, splice trays, and compact organizers. With low bending loss, low attenuation, and high compatibility with G.652.D, this fiber is ideal for FTTH and indoor deployments where space and performance are equally critical.
Key Features
- Low attenuation for full-spectrum (O–E–S–C–L band) transmission
- Excellent resistance to bending loss at short radii
- Low micro-bending loss, suitable for advanced cable designs including ribbon cables
- Low PMD, ideal for high bit-rate and long-distance applications
- Precise geometrical control ensures low splice loss and high splicing efficiency
- Fully compatible with G.652 standard single-mode fibers
Standards
- ITU-T G.657
- IEC 60793-2-50 G.657
Applications
- Fiber-to-the-home (FTTH) deployments
- Multi-dwelling unit (MDU) fiber installations
- Indoor and in-building cabling
- Micro-duct and high-density fiber management systems
- Patch cords, pigtails, and compact optical devices
- Access networks requiring tight bending tolerance
Specifications
G.657.A2 Single-Mode Fiber
|
Features |
Conditions |
Value |
Unit |
|
Optical Requirements |
|||
|
Attenuation |
1310 nm |
≤0.34 |
dB/km |
|
1383 nm (After H2-aging) |
≤0.32 |
dB/km |
|
|
1550 nm |
≤0.20 |
dB/km |
|
|
1625 nm |
≤0.22 |
dB/km |
|
|
Zero Dispersion Wavelength |
- |
1300～1324 |
nm |
|
Zero Dispersion Slope |
- |
≤0.092 |
ps/(nm2·km) |
|
PMD Link Design Value (M=20, Q=0.01%) T |
- |
≤0.1 ≤0.06 |
ps/ ps/ |
|
Cable Cutoff Wavelength (λcc) |
- |
≤1260 |
nm |
|
Mode Field Diameter (MFD) |
1310 nm |
8.6±0.4 |
μm |
|
Effective Group Index Of Refraction (Neff ) |
1310 nm |
1.4682 |
- |
|
1550 nm |
1.4688 |
- |
|
|
Point Discontinuities |
1310 nm |
≤0.05 |
dB |
|
1550 nm |
≤0.05 |
dB |
|
|
Geometrical Requirements |
|||
|
Cladding Diameter |
- |
125.0±0.7 |
μm |
|
Cladding Non-Circularity |
- |
≤0.7 |
% |
|
Coating Diameter |
- |
245±10 |
μm |
|
Coating-Cladding Concentricity Error |
- |
≤12.0 |
μm |
|
Core-Cladding Concentricity Error |
- |
≤0.5 |
μm |
|
Curl (Radius) |
- |
≥4.0 |
m |
|
Environmental Requirements (1310nm & 1550nm & 1625nm) |
|||
|
Temperature Dependence |
-60 ℃～+85 ℃ |
≤0.05 |
dB/km |
|
Water-Soaked Dependence |
23 ℃, for 30 days |
≤0.05 |
dB/km |
|
Damp Heat Dependence |
85 ℃ and 85% RH, for 30 days |
≤0.05 |
dB/km |
|
Dry Heat |
85 ℃, for 30 days |
≤0.05 |
dB/km |
|
Mechanical Requirements |
|||
|
Proof Test |
- |
≥9.0 |
N |
|
Macro-Bend Induced Attenuation 10 turns Ф 30mm |
1550 nm |
≤0.03 |
dB |
|
1625 nm |
≤0.1 |
dB |
|
|
Macro-Bend Induced Attenuation 1 turn Ф 20mm |
1550 nm |
≤0.1 |
dB |
|
1625 nm |
≤0.2 |
dB |
|
|
Macro-Bend Induced Attenuation 1 turn Ф15mm |
1550 nm |
≤0.5 |
dB |
|
1625 nm |
≤1.0 |
dB |
|
|
Coating Strip Force |
Typical Average Force |
1.0~5.0 |
N |
|
Peak Force |
1.3~8.9 |
N |
|
|
Dynamic Stress Corrosion Susceptibility Parameter (Nd) |
- |
≥20 |
- |
|
Delivery Length |
2.1~50.4 |
km/reel |
|
Resources
|
G.657.A2 optical fiber Datasheet |
