Optical Fiber

G.657.A1

Home›Products›Optical Fiber›G.657.A1
G.657.A1
Optical Fiber

G.657.A1

Bend-insensitive, low water peak single-mode fiber | Bend radius down to 10 mm | 242 µm coating | ITU-T G.652.D / G.657.A1

The G.657.A1 Bend-Insensitive Single-Mode Optical Fiber combines the full transmission characteristics of standard non-dispersion shifted single-mode fiber with significantly improved bending performance. Supporting full-band transmission from 1260 nm to 1625 nm, it maintains low loss at bend radii as small as 10 mm in the long-wavelength band. Fully compatible with existing G.652.D networks, its precise geometry ensures low splice loss and high splicing efficiency, while excellent PMD performance supports high-speed transmission over long repeater spacing — making it the preferred choice for FTTH, compact cables, and space-constrained installations.

Need a quote or technical advice? Our team responds within one business day.
Request a Quote Email Enquiry

Specifications

Fiber Type Bend-insensitive, low water peak single-mode fiber
Standard ITU-T G.652.D / G.657.A1 | IEC 60793-2-50 B1.3
Coating Diameter 242 ± 7 µm
Fiber Length 2.1 km to 61 km

Key Features

  • Bend-insensitive single-mode fiber configuration
  • Full-band transmission from 1260 nm to 1625 nm — 1383 nm water peak eliminated
  • Fully compatible with existing G.652.D fiber
  • Cladding diameter: 125.0 ± 0.7 µm
  • Coating diameter: 242 ± 7 µm
  • Core/cladding concentricity error: ≤0.5 µm
  • Cladding non-circularity: ≤0.7%
  • Fiber curl radius: ≥4 m
  • Mode field diameter: 8.8 ± 0.4 µm at 1310 nm | 9.8 ± 0.5 µm at 1550 nm
  • Attenuation: ≤0.350 dB/km at 1310 nm | ≤0.210 dB/km at 1550 nm | ≤0.230 dB/km at 1625 nm
  • Attenuation at 1383 nm (after hydrogen aging): ≤0.350 dB/km
  • Zero dispersion wavelength: 1312 ± 12 nm
  • Dispersion coefficient at 1550 nm: ≤18 ps/(nm·km)
  • Cable cut-off wavelength: ≤1260 nm
  • Polarization mode dispersion (PMD): ≤0.2 ps/√km
  • Macro-bend loss (1 turn, 20 mm diameter): ≤0.75 dB at 1550 nm | ≤1.5 dB at 1625 nm
  • Proof test: ≥100 kpsi (1%)
  • Dynamic fatigue parameter (Nd): ≥20
  • Environmental induced attenuation (-60°C to +85°C cycling, damp heat, water immersion): ≤0.05 dB/km
Use Cases

Applications & Deployments

Optical cables of all structures
FTTH networks and high-speed optical routing
Small bend-radius and small-diameter cables
Fiber optic devices and components
L-band transmission systems
BharatNet and last-mile broadband deployments
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
Contact Us