An Optical Ground Wire (OPGW) is a type of overhead shield wire that contains optical fibers. These optical fibers are enclosed within aluminium or stainless-steel tubes, with a specific number of fibers per tube. The design of the conductor may also incorporate various layers of aluminium-clad steel strands (AW), aluminium strands, aluminium-alloy strands, or a combination of these, based on their electrical and mechanical properties. By combining different types of aluminium, aluminium-clad steel, and aluminium-alloy strands, the OPGW can be tailored to achieve specific electrical and mechanical characteristics as required by the customer.
The primary purpose of the OPGW is twofold：
1. it is employed at the top of transmission line towers to safeguard the phase wire against sudden currents caused by lightning strikes. These transient currents are directed to the ground through the earth wire.
2. the OPGW serves as a medium for transmitting video and audio data through its optical fibers. The number of optical fibers contained within the tube can vary depending on the customer’s requirements, ranging from 12, 24, 36, 48 to even more fibers.
During the production and design of OPGW, either Single-Mode or Multi-Mode fibers can be utilized. Single-Mode fibers are suitable for longer distances exceeding 1 km, offering high bandwidth, while Multi-Mode fibers are used for shorter distances under 1 km, providing lower bandwidth capabilities. There are two primary categories of Single-Mode optical fibers: SMF (Single-Mode Fiber) and NZDSF (Non-Zero Dispersion Shifted Fibers).
SMF, an earlier iteration, is most effective within the wavelength range of 1310 and 1550 nm. This particular fiber type exhibits reduced dispersion at the 1310 nm wavelength, making it suitable for applications involving long distances, urban environments, CATV (Cable Television), intelligent traffic control, and communications. On the other hand, NZDSF represents a more advanced iteration and is tailored for DWDM (Dense Wavelength Division Multiplexing). This newer generation demonstrates significantly decreased dispersion within the wavelength range of 1530 to 1625 nm, in contrast to SMF.
As a leading manufacturer of aluminium-clad steel wires in Iran, Pooya Power Knowledge Enterprise stands as a reference in the industry. With a specialization in producing aluminium-clad steel wires, including those used in OPGW (Optical Ground Wire) applications, we possess the unique ability to tailor OPGW conductors to meet the specific requirements of our customers. Our commitment to efficiency is unwavering, ensuring that we can deliver these customized solutions in the shortest possible timeframe. Our dedication to quality is unparalleled, guaranteeing that each OPGW conductor we produce adheres to the highest standards. We offer a diverse range of sizes and can accommodate various numbers of fibers, providing flexibility and versatility to meet your project’s needs.
| Fiber Specifications(Optical Specifications) |
| Comparison of ITU-T G.655 and ITU-T G.652 Standards |
| ITU-T G.655 | ITU-T G.652 |
| G.655.C | G.655.D | G.655.E | G.652.A | G.652.B | G.652.C | G.652.D |
| Attribute | Details | Value | Value | Value | Value | Value | Value | Value |
| Mode field diameter | Wavelength | 1550 nm | 1550 nm | 1550 nm | 1310 nm | 1310nm | 1310 nm | 1310nm |
Range
of
Nominal
Values | 8-11 μm | 8-11 μm | 8-11 μm | 8.6-9.5μm | 8.6-9.5μm | 8.6-9.5μm | 8.6-9.5 μm |
| Tolerance | ±0.7μm | ±0.6μm | ±0.6 μm | ±0.6μm | ±0.6μm | ±0.6μm | ±0.6μm |
| Cladding diameter | Nominal | 125μm | 125μm | 125 μm | 125μm | 125 μm | 125μm | 125 μm |
| Tolerance | ± 1 μm | ± 1 μm | ±1μm | ±1 μm | ±1 μm | ±1μm | ± 1 μm |
Core
concentricity
error | Maximum | 0.8μm | 0.6μm | 0.6μm | 0.6μm | 0.6 μm | 0.6μm | 0.6μm |
Cladding
non-circularity | Maximum | 2.0% | 1.0% | 1.0% | 1.0% | 1.0% | 1.0% | 1.0% |
Cable cut-off
wavelength | Maximum | 1450 nm | 1450 nm | 1450 nm | 1260 nm | 1260 nm | 1260 nm | 1260 nm |
| Macrobend loss | Radius | 30 mm | 30 mm | 30 mm | 30 mm | 30 mm | 30 mm | 30 mm |
| Number of turns | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
Maximum at
1625 nm | 0.50 dB | 0.1 dB | 0.1dB | 0.1 dB | 0.1 dB | 0.1 dB | 0.1dB |
Attenuation
coefficient | Maximum at
1550 nm | 0.35 dB/km | 0.35 dB/km | 0.35 dB/km | 0.4 dB/km | 0.35 dB/km | 0.30 dB/km | 0.30 dB/km |
Maximum at
1625 nm | 0.4 dB/km | 0.4 dB/km | 0.4 dB/km | - | 0.4 dB/km |
| - |
Maximum at
1310 nm |
| - |
| 0.5 dB/km | 0.4 dB/km | - | - |
Maximum at
1310 to 1625 nm | - | - | - | - |
| 0.4 dB/km | 0.4 dB/km |
Maximum at
1383 nm±3nm | - | - | - | - | × | 0.4 dB/km | 0.4 dB/km |
| PMD coefficient | M | 20 cables | 20 cables | 20 cables | 20 cables | 20 cables | 20 cables | 20 cables |
| Q | 0.01% | 0.01% | 0.01% | 0.01% | 0.01% | 0.01% | 0.01% |
| Maximum PMDQ | 0.20 ps/Nkm | 0.20 ps/vkm | 0.20 ps/ √km | 0.5 ps/ √km | 0.2 ps/vkm | 0.5 ps/vkm | 0.2 ps/ √km |
| Fiber Specifications(Dimensional Specifications) |
| Glass Geometry | Wavelength (nm) | Maximum Value(dB/km) |
| Fiber Curl | ≥4.0m radius of curvature |
| Core -Clad Concentricity | ≤0.5μm |
| Coating Geometry | Coating Diameter | Coating Cladding Concentricity |
| 242±5μm | <12μm |
| Fiber Specifications |
| Environmental Test | Test Condition | Induced Attenuation
1150 nm &1625 nm(dB/km) |
| Temperature Dependency | -60C to +85℃* | ≤0.05 |
| Temperature Humidity Cycling | -10℃ to +85℃ up to 98%RH | ≤0.05 |
| Water Immersion | 23℃±2℃ | ≤0.05 |
| Heat Aging | 85℃±2℃ | ≤0.05 |
| Damp Heat | 85C at 85%RH | ≤0.05 |
| Dispersion | Wavelength (nm) | Dispersion Value(ps/(nm.km)) |
| 1530 | 2.0-5.5 |
| 1565 | 4.5-6.0 |
| 1625 | 5.8-11.2 |
* Reference Temperature = +23 oC Operating Temperature Range = -60 oC to +85 o C
| Optical Ground Wire(OPGW)(IEEE 1138,ITU-T G.655,ITU-T G.652) |
| Type of OPGW | Fiber No. | Total Diameter (mm) | Area(mm)2 | Weight of Conductor
(kg/km) | Rated Strength (kN) | Coefficient of Linear Expansion*10-6 (1/°C) | Modulus of
Elasticity(final)
(kg/mm2) | DC Resistance
at 20。C
(Ω/km) | Short circuit current
20。C-200。C
at 0.5s
(kA) | Short Circuit Capacity (at 0.5 s) (kA².s) |
OPGW 8/SMF/48Core
(ACS:6*2.70
SS tube:1*2.70) | 48 | 8.1 | 34.4 | 259.00 | 40.00 | 13.00 | 16519 | 2.49 | 3.59 | 6.45 |
OPGW 10.5/SMF/48Core
(ACS:6*3.50
SS tube:1*3.50) | 48 | 10.5 | 57.7 | 416.90 | 68.60 | 13.00 | 16111 | 1.469 | 6.9 | 23.8 |
OPGW 10.5/NZDSF
/24Core
(ACS:6*3.50
SS tube:1*3.50) | 24 | 10.5 | 57.7 | 406 | 68.60 | 12.5 | 16111 | 1.469 | 6.9 | 23.8 |
OPGW 12/SMF/48Core
(ACS:6*4.00
SS tube:1*4.00) | 48 | 12 | 75.4 | 533 | 89.6 | 12.6 | 16519 | 1.125 | 8.5 | 36.13 |
OPGW 12/NZDSF/24Core
(ACS:6*4.00
SS tube:1*4.00) | 24 | 12 | 75.4 | 533 | 89.5 | 12.6 | 16519 | 1.125 | 8.5 | 36.13 |
OPGW 13.5/NZDSF/24Core
(ACS:6*3.00+15*2.25
SS tube:1*3.00) | 24 | 13.5 | 102.1 | 712 | 123.1 | 13 | 16836 | 0.831 | 12.2 | 74.42 |
OPGW 16/NZDSF/36Core
(AA:16*2.52-ACS:10*2.52
SS tube:1*5.80)
(with Grease) | 36 | 15.9 | 146.5 | 630 | 84.8 | 17.3 | 9891 | 0.282 | 22.4 | 250.88 |
| Fiber Specifications (Optical Specifications) |
|
| Color Identification of Fiber in the | Stainless Steel Tube Unit | Without Color Ring | With S60 Color Ring | With D60 Color Ring | With T60 Color Ring |
| Fiber No. | Color | Fiber No. | Color | Fiber No. | Color | Fiber No. | Color |
| 1 | Red | 13 | Red | 25 | Red | 37 | Red |
| 2 | Green | 14 | Green | 26 | Green | 38 | Green |
| 3 | Blue | 15 | Blue | 27 | Blue | 39 | Blue |
| 4 | Yellow | 16 | Yellow | 28 | Yellow | 40 | Yellow |
| 5 | Gray | 17 | Gray | 29 | Gray | 41 | Gray |
| 6 | Brown | 18 | Brown | 30 | Brown | 42 | Brown |
| 7 | Violet | 19 | Violet | 31 | Violet | 43 | Violet |
| 8 | Aqua | 20 | Aqua | 32 | Aqua | 44 | Aqua |
| 9 | Black | 21 | Black (White) | 33 | Black (White) | 45 | Black (White) |
| 10 | Orange | 22 | Orange | 34 | Orange | 46 | Orange |
| 11 | White | 23 | White | 35 | White | 47 | White |
| 12 | Pink | 24 | Pink | 36 | Pink | 48 | Pink |
| ColorRing | S60 | Use a single black ring on the fiber surface with 60 mm alternation. |
| D60 | Use a double black ring on the fiber surface with 60 mm alternation. |
| T60 | Use a triple black ring on the fiber surface with 60 mm alternation. |
| Note | The colors can be changed according to customer's request. |
| Use white rings on the black colored fibers. |
