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What is ITU-T G.654 Fiber

ITU-T Recommend G.654 fiber is a cut-off shifted single-mode optical fiber especially used for high bandwidth long distance transmission. The G. 654 fiber is a single mode optical fiber and cable which has the zero-dispersion
opticalfiberwavelengths around 1300nm, the fiber with loss minimized and cut-off wavelength shifted at around 1550nm. the fiber standard was firstly introduced in year 1988. The ITU-T G.654 Fiber could be applied in higher bandwidht submarine systems, back haul system.

Applications

  • 100 Gb/s, 400 Gb/s, and 1 Tb/s using coherent modulation formats
  • Dense wave-division multiplexing
  • Long unrepeatered spans such as those encountered in remote regions
  • Optically-routed mesh networks
  • Terabit super-channels
  • Ultra-long haul 10 Gb/s and 100 Gb/s

Specifications:

Parameters ITU-T G.654 A ITU-T G.654 B ITU-T G.654 C ITU-T G.654 D
Fiber Attribute
Mode Field Diameter Wavelenths 1550nm 1550nm 1550nm 1550nm
Core diameter 9.5 ~ 10.5um 9.5 ~ 13.0um 9.5 ~ 10.5um 11.5 ~ 15.0um
Tolerance ± 0.7um ± 0.7um ± 0.7um ± 0.7um
Cladding Diameter Clad Diameter 125um 125um 125um 125um
Tolerance ± 0.7um ± 1um ± 0.7um ± 0.7um
Clad Non-Circularity maximum ≤2.0 % ≤2.0 % ≤2.0 % ≤2.0 %
Core/Clad Concentricity Error (Offset) maximum ≤ 0.8um ≤ 0.8um ≤ 0.8um ≤ 0.8um
Cable Cutoff Wavelength (λcc) maximum ≤ 1530 nm ≤ 1530 nm ≤ 1530 nm ≤ 1530 nm
Macrobend Attenuation Radius 30mm 30mm 30mm 30mm
number of turns 100 turns 100 turns 100 turns 100 turns
maximum at 1652nm 0.5dB 0.5dB 0.5dB 0.5dB
Proof Stress Minimum 0.69Gpa 0.69Gpa 0.69Gpa 0.69Gpa
Chromatic Dispersion Coefficient D1550max 20px/nm.km 20px/nm.km 20px/nm.km 23px/nm.km
S1550max 0.070ps/nm2.km 0.070ps/nm2.km 0.070ps/nm2.km 0.070ps/nm2.km
Uncabled Fiber PMD Coefficient Maximum Note(2) Note(2) Note(2) Note(2)
Cable Attribute
Attenuation coefficient (Note 1) Maximum at 1550 nm 0.22 dB/km 0.22 dB/km 0.22 dB/km 0.22 dB/km
PMD coefficient
(Note 2)		 M 20 cables 20 cables 20 cables 20 cables
Q 0.01% 0.01% 0.01% 0.01%
Maximum PMDQ  0.5 ps/√km  0.5 ps/√km  0.5 ps/√km  0.5 ps/√km
NOTE 1 – The attenuation coefficient values listed in this table should not be applied to short cables such as jumper cables. For example, [b-IEC 60794-2-11] specifies the attenuation coefficient of indoor cable as 1.0 dB/km or less.
NOTE 2 – According to clause 6.2, a maximum PMDQ value on uncabled fibre is specified in order to support the primary requirement on cable PMDQ.

Source from ITU-T G.654 Recommendation

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