Optical Fiber Specifications

Fiber type U G.655.D G.654.E
ITU-T recommendation G.652.D / G.657.A1 G.655.D G.654.E
Dimensional Specifications
Core-Clad Concentricity 0.5 0.8
Cladding Diameter 125±0.7 125±1.0 125±0.7
Cladding Non-Circularity 0.7 0.6 2.0
Coating Diameter 242±5 245±10 243.5±3.0
Transmission Specifications
Wavelength, nm 1310 – 1625 1550 – 1625 1550 – 1625
Maximum Attenuation (dB/km)
1310 nm wavelength 0.32
1383 nm wavelength 0.32
1490 nm wavelength
1550 nm wavelength 0.18 0.22 0.17
1625 nm wavelength 0.20 0.27 0.19
Dispersion ps/(nm*km)
1550 nm wavelength 18 2…6 23
1625 nm wavelength 22 4.5…11.2
Polarization Mode Dispersion (PMD), ps/√km 0.2 0.2 0.1
Zero Dispersion 0.092 0.084 0.084
Zero Dispersion Wavelength, nm 1300…1324
Cable Cutoff Wavelength, nm 1260 1530
Mode-Field Diameter, (μm)
1310 nm wavelength 9.2±0.4
1550 nm wavelength 10.4±0.5 10.8…13.2
Macrobend Loss, dB, λ=1550 nm/1625 nm
(1 turn х R16.0 mm), dB 0.5/—
(1 turn х R10.0 mm), dB 0.75/1.5
(1 turn х R7.5mm), dB
(1 turn х R5.0 mm), dB
(100 turns х R30 mm), dB —/0.05 —/0.1
Fiber type ОМ2 ОМ3 ОМ4 ОМ5 ОМ1
Standard ITU-T G.651.1 ITU-T G.651.1 ITU-T G.651.1 ITU-T G.651.1 IEC 60793-2-10
Dimensional Specifications
Core Diameter 50.0±2.5 50.0±2.5 50.0±2.5 50.0±2.5 62.5±3.0
Core-Clad Concentricity 1.5
Cladding Diameter 125±1 125±1 125±1 125±1 125±2
Cladding Non-Circularity 1
Coating Diameter 242±5
Maximum Attenuation (dB/km)
850 nm wavelength 2.3 2.3 2.3 2.3 2.9
953 nm wavelength 1.7
1300 nm wavelength 0.6
Numerical Aperture 0.200±0.015 0.200±0.015 0.200±0.015 0.200±0.015 0.275±0.015
Overfilled Bandwidth (MHz * km)
850 nm wavelength 700 1500 3500 3500 200
953 nm wavelength 1850
1300 nm wavelength 500
Effective Group Index of Retraction
850 nm wavelength 1.482 1.482 1.482 1.482 1.496
1300 nm wavelength 1.477 1.477 1.477 1.477 1.491
Attenuation to macrobending (2 turns on a bend former, radius of 15 mm), dB:
at a wavelength of 850 nm 0.1 0.1 0.1 0.1
at a wavelength of 1300 nm 0.3 0.3 0.3 0.3
Attenuation to macrobending (2 turns on a bend former, radius of 7.5 mm), dB:
at a wavelength of 850 nm 0.2 0.2 0.2 0.2
at a wavelength of 1300 nm 0.5 0.5 0.5 0.5