Optical Fiber
Bending Insensitive Single mode optical fiber G652 G652D
G.652.D is the industry-standard single-mode optical fiber — the most widely deployed fiber type worldwide, accounting for over 95% of all installed fiber. It features a zero water peak across the full spectrum from 1260nm to 1625nm, enabling CWDM and DWDM transmission across all wavelength bands. With low attenuation (≤ 0.22 dB/km at 1550nm) and low PMD (≤ 0.2 ps/√km), it supports transmission rates from 1G to 100G and beyond over distances exceeding 100km. Compliant with ITU-T G.652.D and IEC 60793-2-50 standards.
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ZTOFC Low water peak dispersion unshifted Single-mode fibre optic is designed specially for optical transmission systems operating over the entire wavelength window from 1260 nm to 1625 nm. By suppressing the water peak that occurs near 1383 nm in conventional single mode fibre optic due to hydroxyl (OH–) ions absorption, ZTOFC fibre is able to open E-band (1360-1460nm) for operation, and consequently provides 100 nm more usable wavelengths.
Specifications
Optical Characteristics
| Characteristics | Conditions | Specified values | Units |
| Attenuation | 1310nm | ≤0.34 | [dB/km] |
| Attenuation | 1383nm(after H2-aging) | ≤0.34 | [dB/km] |
| Attenuation | 1550nm | ≤0.20 | [dB/km] |
| Attenuation | 1625nm | ≤0.24 | [dB/km] |
| Attenuation vs. WavelengthMax. α difference | 1285-1330nm, in reference to 1310nm | ≤0.03 | [dB/km] |
| Attenuation vs. WavelengthMax. α difference | 1525-1575nm, in reference to 1550nm | ≤0.02 | [dB/km] |
| Dispersion Coefficient | 1285-1340nm | -3.5 to 3.5 | [ps/(nm·km)] |
| Dispersion Coefficient | 1550nm | ≤18 | [ps/(nm·km)] |
| Dispersion Coefficient | 1625nm | ≤22 | [ps/(nm·km)] |
| Zero Dispersion Wavelength(λ0) | — | 1300-1324 | [nm] |
| Zero Dispersion Slope(S0) | — | ≤0.092 | [ps/(nm2·km)] |
| Typical Value | — | 0.086 | [ps/(nm2·km] |
| PMD / Maximum Individual Fibre | — | ≤0.1 | [ps/√km] |
| PMD / Link Design Value（M=20，Q=0.01%) | — | ≤0.06 | [ps/√km] |
| PMD / Typical Value | — | 0.04 | [ps/√km] |
| Cable Cutoff Wavelength (λCC) | — | ≤1260 | [nm] |
| Mode Field Diameter（MFD） | 1310nm | 8.7-9.5 | [μm] |
| Mode Field Diameter（MFD） | 1550nm | 9.8-10.8 | [μm] |
| Effective Group Index of Refraction（Neff ） | 1310nm | 1.466 | — |
| Effective Group Index of Refraction（Neff ） | 1550nm | 1.467 | — |
| Point Discontinuities | 1310nm | ≤0.05 | [dB] |
| Point Discontinuities | 1550nm | ≤0.05 | [dB] |
Geometrical Characteristics
| Characteristics | Specified values | Units |
| Cladding Diameter | 125.0±0.7 | [μm] |
| Cladding Non-Circularity | ≤1.0 | [%] |
| Coating Diameter | 235-250 | [μm] |
| Coating-Cladding Concentricity Error | ≤12.0 | [μm] |
| Coating Non-Circularity | ≤6.0 | [%] |
| Core-Cladding Concentricity Error | ≤0.6 | [μm] |
| Curl(radius) | ≥4 | [m] |
| Delivery Length | Up to 50.4 | [km/reel] |
Environmental Characteristics ( 1310nm, 1550nm & 1625nm )
| Characteristics | Conditions | Specified values | Units |
| 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 Attenuation | 23°C, for 30 days | ≤0.05 | [dB/km] |
| Damp Heat Dependence Induced Attenuation | 85°C and 85% RH, for 30 days | ≤0.05 | [dB/km] |
| Dry Heat Aging | 85℃, for 30 days | ≤0.05 | [dB/km] |
Mechanical Specification
| Characteristics | Conditions | Specified values | Units |
| 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 Radius | 1625nm | ≤0.05 | [dB] |
| 100 Turns Around a Mandrel of 25 mm Radius | Radius1310nm and 1550nm | ≤0.05 | [dB] |
| 1 Turn Around a Mandrel of 16 mm Radius | 1550nm | ≤0.05 | [dB] |
| Coating Strip Force | typical average force | 1.5 | [N] |
| Coating Strip Force | peak force | 1.3-8.9 | [N] |
| Dynamic Fatigue Parameter(nd) | — | ≥20 | — |
Applications
Thanks to its broad usable optical spectrum and outstanding optical performance, ZTOFC fibre is the optimum choice that supports various applications such as Ethernet, Internet Protocol (IP), Asychronous Transfer Mode (ATM), Synchronous Optical Network (SONET) and Wavelength Division Multiplexing (WDM). ZTOFC fibre provides more bandwidth for backbone, metropolitan area and access networks.
Characteristics
Designed for operation over the full optical spectrum from 1260-1625 nm, which provides 50% more usable wavelengths and hence the transmission capacity is increased
Outstanding optical performance supporting high-speed transmission technologies such as DWDM and CWDM
Being compatible with existing 1310 nm equipment
Good protection and excellent strip force stability
Accurate geometrical parameters that insure low splicing loss and high splicing efficiencyStandard
ZTOFC fibre complies with or exceeds the ITU-T Recommendation G.652.D and the IEC 60793-2-50 typeB1.3 Optical Fibre Specification
ZTOFC tightens many parameters of fibre products so as to offer more conveniences to customersKey Features
- Zero water peak: full-spectrum operation from 1260nm to 1625nm
- Attenuation ≤ 0.22 dB/km @ 1550nm (premium grade available ≤ 0.19 dB/km)
- Low PMD ≤ 0.2 ps/√km — supports 40G and 100G transmission
- CWDM and DWDM ready — all 18 CWDM channels available
- Industry-standard 125μm cladding, 245μm coating diameter
- Compliant with ITU-T G.652.D, IEC 60793-2-50, Telcordia GR-20
Frequently Asked Questions
1. What makes G.652.D different from G.652.A/B?
The key difference is the water peak. G.652.A and B have a hydroxyl (OH⁻) absorption peak around 1383nm, blocking the E-band. G.652.D eliminates this peak, opening the full 1260–1625nm spectrum for CWDM/DWDM transmission. G.652.D also has lower PMD (0.2 vs 0.5 ps/√km), critical for high-speed transmission.
2. What fiber count and length options are available?
G.652.D fiber is supplied on standard reels of 25.2km, 50.4km, or custom lengths. It is incorporated into our cable products in fiber counts ranging from 2 to 288. Contact us for volume pricing and specification sheets.
3. Is G.652.D suitable for 5G fronthaul networks?
Yes. G.652.D remains the recommended fiber for 5G fronthaul, midhaul, and backhaul applications. It supports 25G and 50G eCPRI links over distances up to 10–20km, which covers the vast majority of 5G deployment scenarios.
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