Bending Insensitive Single-Mode Fiber (G.657.A1)
Overview
G.657.A1 bend-insensitive single-mode optical fiber is optimized for flexibility, low macro-bending loss, and high-performance transmission across the 1260–1625 nm range. Designed for FTTx, in-building cabling, and compact optical components, it supports tight bending radii (5–15 mm) without significant signal loss. Fully compliant with ITU-T G.657 and IEC standards, it ensures reliable, high-speed data delivery in dense network environments. Compatible with G.652.D fiber and ideal for FTTH applications, Bland G.657.A1 fiber offers superior mechanical strength, low splice loss, and long-term optical stability—making it the preferred choice for next-generation broadband and access networks.
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
- Access network
- Compact in-building cable routes
Specifications
G.657.A1 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%) |
- |
≤0.1 ≤0.06 |
ps/ ps/ |
|
Cable Cutoff Wavelength (λcc) |
- |
≤1260 |
nm |
|
Mode Field Diameter (MFD) |
1310nm |
8.6±0.4 |
μm |
|
Effective Group Index Of Refraction (Neff ) |
1310nm |
1.4682 |
- |
|
1550nm |
1.4688 |
- |
|
|
Point Discontinuities |
1310nm |
≤0.05 |
dB |
|
1550nm |
≤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 |
1550nm |
≤0.15 |
dB |
|
1625nm |
≤0.5 |
dB |
|
|
Macro-Bend Induced Attenuation 1 turn Ф 20mm |
1550nm |
≤0.5 |
dB |
|
1625nm |
≤1.5 |
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.A1 optical fiber Datasheet |
