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Does OPGW fiber optic cable require a span

Optical network knowledge brief Published 08 Nov 2024

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

Yes, OPGW fiber optic cables are designed and installed with different spans to match the distances between transmission towers, and careful planning is required to avoid mid-span splicing.Span Considerations

OPGW (Optical Ground Wire) cables serve a dual purpose: they act as a grounding wire for high-voltage lines and carry optical fibers for data transmission . Because of this dual function, the length of each cable segment must be coordinated with the span between towers. It is generally impractical to splice OPGW cables in mid-span, so the cable lengths are planned to match the tower spacing to minimize waste and maintain mechanical integrity .

Installation and Splicing

When fiber connections are required between cable segments, weatherproof splice boxes are installed on towers. These boxes allow the optical fibers to be joined safely without compromising the cable's structural or electrical performance . Additionally, transition boxes may be used to connect OPGW fibers to standard outside plant fiber cables for integration with terminal equipment .

Mechanical and Design Factors

OPGW cables come in different constructions, such as central loose tube and multi loose tube types, which can accommodate varying fiber counts and mechanical requirements . The design ensures that fibers are protected from strain and environmental stress, which is particularly important for longer spans. The cable's tensile strength, sag performance, and anti-lightning protection are all considered when determining the appropriate span length .

Practical Implications
  • Tower spacing: Cable lengths are selected to match the distance between towers, which can vary depending on terrain and line design.
  • Fiber protection: Loose tube construction prevents fiber strain over long spans.
  • High fiber counts: Multi loose tube designs allow for higher fiber counts over longer spans without compromising mechanical performance.
  • Planning: Accurate planning reduces the need for mid-span splicing and ensures reliable data transmission and electrical grounding. In summary, OPGW cables are indeed installed with different spans tailored to the tower distances, and their design and installation require careful coordination to maintain both electrical and optical performance .

Does OPGW fiber optic cable require a span - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

Does OPGW fiber optic cable require a span

Optical ground wire

OverviewInstallationHistoryConstructionComparison with other methodsApplicationExternal links

Installation of OPGW requires some additional planning because it is impractical to splice an OPGW cable in mid-span; the lengths of cable purchased must be coordinated with the spans between towers to prevent waste. Where fibers must be joined between lengths, a weatherproof splice box is installed on a tower; a similar box is used to transition from the OPGW to an outside plant fiber-only cable to connect the fibers to terminal equipment.

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Technical note

This reference is intended for preliminary optical-network research. Compatibility, link budgets, installation methods, test limits and applicable standards must be verified for the specific project.

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