G.657.A fiber combines two attractive features: excellent low macro-bending sensitivity and low water-peak level. It is comprehensively optimized for use in O-E-S-C-L band (1260 -1625 nm). The fiber bending insensitive feature not only guarantees L-band applications but also allows for easy installation without excessive care when storing the fibre especially for FTTH networks application. Bending radii in fibre guidance ports can be reduced as well as minimum bend radii in wall and corner mountings.
• Extremely high bending loss resistance in the 7.5 to 15 mm bending radius range
• Full compatibility with all G.652 fibres for any applications
• Low attenuation satisfying the operation demand in O-E-S-C-L band
• Low PMD satisfying high bit-rate and long distance transmission requirements
• Low bending loss for highly demanding cable designs including ribbons
• Accurate geometrical parameters that insure low splicing loss and high splicing efficiency
• High nd-value satisfying long operational lifetime in minimum bend radius
| Characteristics | Conditions | Specified Values | Units |
|---|---|---|---|
| Optical Characteristics | |||
| Attenuation | 1310nm | ≤0.35 | [dB/km] |
| 1383nm (after H₂-aging) | ≤0.35 | [dB/km] | |
| 1460nm | ≤0.25 | [dB/km] | |
| 1490nm | ≤0.23 | [dB/km] | |
| 1550nm | ≤0.21 | [dB/km] | |
| 1625nm | ≤0.23 | [dB/km] | |
| Attenuation vs. Wavelength Max. α difference |
1285-1330nm, in reference to 1310nm | ≤0.03 | [dB/km] |
| 1525-1575nm, in reference to 1550nm | ≤0.02 | [dB/km] | |
| Zero Dispersion Wavelength (λ₀) | -- | 1300-1324 | [nm] |
| Zero Dispersion Slope (S₀) | -- | ≤0.092 | [ps/(nm²·km)] |
| PMD | Maximum Individual Fibre | ≤0.1 | [ps/√km] |
| Link Design Value (M=20, Q=0.01%) | ≤0.06 | [ps/√km] | |
| Typical Value | 0.04 | [ps/√km] | |
| Cable Cutoff Wavelength (λcc) | -- | ≤1260 | [nm] |
| Mode Field Diameter (MFD) | 1310nm | 8.4-9.2 | [μm] |
| 1550nm | 9.3-10.3 | [μm] | |
| Effective Group Index of Refraction (Neff) | 1310nm | 1.466 | -- |
| 1550nm | 1.467 | -- | |
| Point Discontinuities | 1310nm | ≤0.05 | [dB] |
| 1550nm | ≤0.05 | [dB] | |
| Geometrical Characteristics | |||
| Cladding Diameter | -- | 125.0±0.7 | [μm] |
| Cladding Non-Circularity | -- | ≤0.7 | [%] |
| Coating Diameter | -- | 235-245 | [μm] |
| Coating-Cladding Concentricity Error | -- | ≤12.0 | [μm] |
| Coating Non-Circularity | -- | ≤6.0 | [%] |
| Core-Cladding Concentricity Error | -- | ≤0.5 | [μm] |
| Curl (radius) | -- | ≥4 | [m] |
| Delivery Length | -- | Up to 50.4 | [km/reel] |
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