Factory supplied “Optical Fiber Secondary Coating ” - Single-mode G657B3 super bending resistant optical fiber – GELD
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Factory supplied “Optical Fiber Secondary Coating ” - Single-mode G657B3 super bending resistant optical fiber – GELD Detail:
● The minimum bending radius can reach 5mm, which is fully compatible with G.652.D fiber.
● Low attenuation, meeting the communication requirements of O-E-S-C-L band.
● Used in various optical cables including ribbon cables, it has extremely low bending additional loss.
● Accurate geometric parameters and large die field diameter ensure low welding loss and high welding efficiency.
● High dynamic fatigue parameters ensure the service life under ultra-small bending radius.



1. Optical fiber jumpers of various structures
2. FTTX high-speed optical routing
3. Optical cable with small bending radius
4. Small-size optical fiber device and optical device



| Characteristics | Conditions | Units | Specified values | |
| Optical Characteristics | ||||
|
Attenuation |
1310nm |
dB/km |
≤0.35 |
|
|
1383nm |
dB/km |
≤0.35 |
||
|
1550nm |
dB/km |
≤0.21 |
||
|
1625nm |
dB/km |
≤0.23 |
||
|
Attenuation vs. Wavelength |
1285~1330nm, @1310nm |
dB/km |
≤0.03 |
|
|
1525~1575nm, @1550nm |
dB/km |
≤0.02 |
||
|
Zero Dispersion Wavelength(λ0) |
– |
nm |
1300~1324 |
|
|
Zero Dispersion Slope(S0) |
– |
ps/(nm2·km) |
≤0.092 |
|
|
(PMD) |
Max. Individual Fiber |
– |
ps/√km |
≤0.1 |
|
Link Design Value(M=20,Q=0.01%) |
– |
ps/√km |
≤0.06 |
|
|
Typical value |
– |
ps/√km |
0.04 |
|
|
Cable cut-off wavelength(λcc) |
– |
nm |
≤1260 |
|
|
Mode Field Diameter(MFD) |
1310nm |
μm |
8.2~9.0 |
|
|
1550nm |
μm |
9.1~10.1 |
||
|
Effective Group Index of Refraction(Neff) |
1310nm |
1.468 |
||
|
1550nm |
1.469 |
|||
|
Point discontinuity |
1310nm |
dB |
≤0.05 |
|
|
1550nm |
dB |
≤0.05 |
||
| Geometrical Characteristics | ||||
|
Cladding Diameter |
– |
μm |
125.0±0.7 |
|
|
Cladding Non-Circularity |
– |
% |
≤0.7 |
|
|
Coating Diameter |
– |
μm |
235~245 |
|
|
Coating-Cladding Concentricity Error |
– |
μm |
≤12.0 |
|
|
Coating Non-Circularity |
– |
% |
≤6.0 |
|
|
Core-Cladding Concentricity Error |
– |
μm |
≤0.5 |
|
|
Curl(radius) |
– |
m |
≥4 |
|
|
Delivery Length |
– |
km per spool |
Max. 50.4 |
|
| Mechanical Specifications | ||||
|
Proof Test |
– |
N |
≥9.0 |
|
|
– |
% |
≥1.0 |
||
|
– |
kpsi |
≥100 |
||
|
Macro-bend Induced Loss |
1Turn Around a Mandrel of 10mm Radius |
1550nm |
dB |
≤0.03 |
|
1 Turn Around a Mandrel of 7.5mm Radius |
1625nm |
dB |
≤0.1 |
|
|
1 Turn Around a Mandrel of 7.5mm Radius |
1550nm |
dB |
≤0.08 |
|
|
1 Turn Around a Mandrel of 7.5mm Radius |
1625nm |
dB |
≤0.25 |
|
|
1 Turn Around a Mandrel of 5mm Radius |
1550nm |
dB |
≤0.15 |
|
|
1 Turn Around a Mandrel of ,5mm Radius |
1625nm |
dB |
≤0.45 |
|
|
Coating stripping force |
Typical average value |
N |
1.5 |
|
|
Peak value |
N |
1.3~8.9 |
||
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