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
wavelengths 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: Tarluz Blog: What is G 654 Fiber
