Optical Fiber

G.654.D

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G.654.D
Optical Fiber

G.654.D

Cut-off shifted, large mode field single-mode fiber | Effective area: 113 µm² | Attenuation ≤0.180 dB/km at 1550 nm | ITU-T G.654.D

The G.654.D Large Effective Area Optical Fiber is a cut-off wavelength shifted single-mode fiber combining ultra-low attenuation with a large mode field diameter and effective area. The large effective area significantly reduces non-linear effects during high-power, multi-wavelength transmission — enabling error-free, high-speed signal transmission over very long unrepeated distances. Engineered to meet ITU-T G.654.D and IEC 60793-2-50 B1.2 requirements, the G.654.D fiber is purpose-built for long-distance submarine optical cable systems and high-capacity backbone links where every decibel of loss budget matters.

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Specifications

Fiber Type Cut-off shifted, large effective area single-mode fiber
Standard ITU-T G.654.D | IEC 60793-2-50 B1.2
Effective Area (1550 nm) 113 ± 10 µm²
Fiber Length 2.1 km to 61 km

Key Features

  • Large effective area single-mode fiber configuration
  • Cladding diameter: 125 ± 1 µm
  • Coating diameter: 245 ± 10 µm
  • Coating/cladding concentricity error: ≤12.0 µm
  • Core/cladding concentricity error: ≤0.6 µm
  • Cladding non-circularity: ≤1.0%
  • Mode field diameter at 1550 nm: 12.0 ± 0.7 µm
  • Attenuation: ≤0.180 dB/km at 1550 nm | ≤0.200 dB/km at 1625 nm
  • Point discontinuity at 1550 nm: ≤0.1 dB
  • Dispersion coefficient at 1550 nm: 17–23 ps/(nm·km)
  • Dispersion slope at 1550 nm: 0.05–0.07 ps/(nm²·km)
  • PMD link design value: ≤0.10 ps/√km
  • Proof test: ≥0.69 GPa
  • Coating strip force: 1.0–5.0 N (average)
  • Dynamic fatigue parameter (Nd): ≥20
  • Macro-bend loss (30 mm radius, 100 turns, 1550/1625 nm): ≤2.0 dB
  • Environmental induced attenuation (damp heat, dry heat, water immersion, temperature cycling): ≤0.05 dB/km
  • Operating temperature: -60°C to +85°C
Use Cases

Applications & Deployments

Long-distance submarine optical cable systems
Unrepeated and long-span high-speed transmission links
High-capacity, multi-wavelength (DWDM) transmission systems
High-power optical transmission where non-linear effects must be minimised
Defence communication networks and secure military links
Fiber-optic controlled drones with jam-resistant command and video links
Tethered drone systems for persistent surveillance and reconnaissance
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