ZTO Bending Insensitive Single-mode Fiber G.657.A1

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ZTO bending insensitive single-mode fibre optic encompasses all the features of fibre and provides good resistance to macro-bending. It has 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). It offers good resistance to additional losses due to low macro-bending in the 1625 nm wavelength region. This not only supports L-band applications but also allows for easy installation without excessive care when storing the fibre, for example, in splicing cassettes. For cable use inside buildings, the fibre supports installation with small cable bending radii and compact organizers.


Optical Characteristics

CharacteristicsConditionsSpecified valuesUnits
Attenuation1383nm(after H2-aging)≤0.35[dB/km]
Attenuation vs. Wavelength
Max. α difference
1285-1330nm, in reference to 1310nm≤0.03[dB/km]
Attenuation vs. Wavelength
Max. α difference
1525-1575nm, in reference to 1550nm≤0.02[dB/km]
Dispersion Coefficient1285-1340nm-3.5 to 3.5[ps/(nm·km)]
Dispersion Coefficient1550nm≤18[ps/(nm·km)]
Dispersion Coefficient1625nm≤22[ps/(nm·km)]
Zero Dispersion Wavelength(λ0)1300-1324[nm]
Zero Dispersion Slope(S0)≤0.092[ps/(nm2·km)]
Typical Value≤0.086
PMD / Maximum Individual Fibre≤0.1[ps/√km]
PMD / Link Design Value(M=20,Q=0.01%)≤0.06[ps/√km]
PMD / Typical Value0.04[ps/√km]
Cable Cutoff Wavelength (λCC)≤1260[nm]
Mode Field Diameter(MFD)1310nm8.4-9.2[μm]
Mode Field Diameter(MFD)1550nm9.3-10.3[μm]
Effective Group Index of Refraction(Neff )1310nm1.466
Effective Group Index of Refraction(Neff )1550nm1.467
Point Discontinuities1310nm≤0.05[dB]
Point Discontinuities1550nm≤0.05[dB]

Geometrical Characteristics

Characteristics Specified values Units
Cladding Diameter125.0±0.7[μm]
Cladding Non-Circularity≤0.7[%]
Coating Diameter235-245[μm]
Coating-Cladding Concentricity Error≤12.0[μm]
Coating Non-Circularity≤6.0[%]
Core-Cladding Concentricity Error≤0.5[μm]
Delivery LengthUp to 50.4[km/reel]

Environmental Characteristics ( 1310nm, 1550nm & 1625nm )

CharacteristicsConditionsSpecified valuesUnits
Temperature Dependence Induced Attenuation-60℃ to +85℃≤0.05[dB/km]
Temperature-Humidity Cycling Induced Attenuation-10°C to +85°C, 98% RH≤0.05[dB/km]
Watersoak Dependence Induced Attenuation23°C, for 30 days≤0.05[dB/km]
Damp Heat Dependence Induced Attenuation85°C and 85% RH, for 30 days≤0.05[dB/km]
Dry Heat Aging85℃, for 30 days≤0.05[dB/km]

Mechanical Specification

CharacteristicsConditionsSpecified valuesUnits
Proof Test≥9.0[N]
Proof Test≥1.0[%]
Proof Test≥100[kpsi]
Macro-bend Induced Loss
10 Turns Around a Mandrel of 15 mm Radius1550nm≤0.25[dB]
10 Turns Around a Mandrel of 15 mm Radius1625nm≤1.0[dB]
1 Turn Around a Mandrel of 10 mm Radius1550nm≤0.75[dB]
1 Turn Around a Mandrel of 10 mm Radius1625nm≤1.5[dB]
Coating Strip Forcetypical average force1.5[N]
Coating Strip Forcepeak force1.3-8.9[N]
Dynamic Fatigue Parameter(nd)≥20


  • Short pitch cables for special application
  • High performance optical network operating in O-E-S-C-L band
  • High speed optical routes for Fibre-to-the-Home networks
  • High speed optical routes in buildings (FTTx)
  • Cables with low bending requirements


  • Low attenuation satisfying the operation demand in O-E-S-C-L band
  • Good bending loss resistance at short radius bends
  • Low bending loss for highly demanding cable designs including ribbons
  • Low PMD satisfying high bit-rate and long distance transmission requirements
  • Accurate geometrical parameters that insure low splicing loss and high splicing efficiency


  • ZTO bending insensitive single mode fibre meets or exceeds the ITU-T Recommendation G.652.D/G.657.A1 including the IEC 60793-2-50 type B1.3/B6.a1 Optical Fibre Specification

For specific data sheet, please write to info@ztocable.com, whatsapp+86 15802524130 Or click here!