ZTO Large Effective Area High Capacity Positive Dispersion Shifted Single-mode Fiber G.655

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ZTO fiber optic (Large Effective Area High Capacity Positive Dispersion Shifted Single-mode Fiber) is comprehensively optimized for attenuation and dispersion performance at the 1550 nm operating wavelength. The fiber has the lowest attenuation and moderate dispersion at 1550 nm, which enables excellent performance in multi-channel Dense Wavelength Division Multiplex (DWDM) systems traditionally operating in the C-band (1530 nm -1565 nm), as well as in emerging L-band (1565 nm -1625 nm) systems.


Optical Characteristics

CharacteristicsConditionsSpecified valuesUnits
Attenuation vs. Wavelength
Max. α difference
1525-1575nm, in reference to 1550nm≤0.02[dB/km]
Dispersion Coefficient1530-1565nm2.0-6.0[ps/(nm·km)]
Dispersion Coefficient1565-1625nm4.5-11.2[ps/(nm·km)]
Zero Dispersion Wavelength(λ0)≤1520[nm]
Dispersion Slope1550nm≤0.084[ps/(nm2·km]
Typical dispersion slope1550nm0.075[ps/(nm2·km]
PMD / Maximum Individual Fibre≤0.2[ps/√km]
PMD / Link Design Value(M=20,Q=0.01%)≤0.08[ps/√km]
PMD / Typical Value0.04[ps/√km]
Cable Cutoff Wavelength (λCC)≤1450[nm]
Mode Field Diameter(MFD)1550nm9.1-10.1[μm]
Effective Group Index of Refraction(Neff )1550nm
Effective Group Index of Refraction(Neff )1625nm
Point Discontinuities1550nm≤0.05[dB]

Geometrical Characteristics

Characteristics Specified values Units
Cladding Diameter125.0±0.7[μm]
Cladding Non-Circularity≤1.0[%]
Coating Diameter235-250[μm]
Coating-Cladding Concentricity Error≤12.0[μm]
Coating Non-Circularity≤6.0[%]
Core-Cladding Concentricity Error≤0.6[μm]
Delivery LengthUp to 25.2[km/reel]

Environmental Characteristics ( 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 Attenuation
100 Turns Around a Mandrel of 30 mm Radius1625nm≤0.05[dB]
100 Turns Around a Mandrel of 25 mm Radius 1550nm≤0.05[dB]
1 Turn Around a Mandrel of 16 mm Radius1550nm≤0.05[dB]
Coating Strip Forcetypical average force1.5[N]
Coating Strip Forcepeak force1.3-8.9[N]
Dynamic Fatigue Parameter(nd)≥20


ZTO fibre is the commercialized fibre that has the largest effective area in the G.655 series. The fibre is suitable for application of high output power Erbium Doped Fibre Amplifier (EDFA) and multi-channel Dense Wavelength Division Multiplex (DWDM), and can be effectively applied in the high bit-rate both single-and multi-channel, long distance digital transmission links even without dispersion compensation.


  • Being applicable in the high bit-rate operation across 1530-1565 nm and 1565-1625 nm band
  • Large effective area ensures good economic return from the transmission system
  • Low attenuation, low dispersion, low PMD and low zero dispersion slope that satisfy the demand of transmission links
  • Low bending induced loss at 1550 nm and at the moresensitive 1625 nm wavelength


  • ZTO  fibre complies with or exceeds the ITU-T G.655.C/D recommendation and IEC-60793-2-50 B4.c/d Optical Fibre Specification
  • ZTO tightens many parameters of fibre products so as to offer more conveniences to customers 

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