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Cold splicing method for leather cables and pigtails

Fiber and communications infrastructure knowledge brief Published 13 Nov 2025

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Cold splicing is a fast, mechanical method to join optical fibers or pigtails using a precise V-groove connector without fusion welding.

Overview

Cold splicing, also called mechanical or physical splicing, is used to connect two optical fibers or a fiber to a pigtail by aligning their cores in a V-shaped groove inside a cold splicer. Unlike fusion splicing, it does not require heat or welding, making it faster, easier, and cost-effective for field installations such as FTTH or FTTX projects. This method is particularly suitable for double-core leather cables and short pigtails where quick deployment is needed.

Tools Required

Cold splicer: Contains a precise V-groove to align fibers. Fiber cleaver: Ensures clean, accurate cuts on fibers and pigtails; some cleavers support leather cables and pigtails simultaneously. Alcohol wipes: For cleaning stripped fiber ends.

Cold connectors: Snap-in connectors that hold fibers in place.

Step-by-

Step Procedure

Install the cold connector: Snap the connector into the splicer's middle slot and secure the side rings. Prepare the fibers: Strip about 3 cm of the fiber coating and clean with alcohol. Cleave the fiber: Use a fiber cleaver to cut approximately 1.

4 cm of bare fiber for precise alignment. Insert fibers into the connector: Place one fiber end into the cold connector, then repeat for the other fiber. Secure and test: Ensure both fibers are snapped into the V-groove and side rings are tight.

Test the connection for optical loss to confirm a successful splice.

Advantages

Quick and convenient: No fusion splicer or heat required. Low cost: Reduces equipment and operational expenses. Field-friendly: Ideal for on-site installations and repairs.

Reusable: Some cold connectors can be adjusted or replaced if needed.

Considerations

Slightly higher loss: Cold splices may have slightly higher insertion loss compared to fusion splices, so testing is essential. Alignment precision: Proper cleaving and careful insertion are critical to minimize signal loss. Environmental protection: Cold splices should be enclosed in protective sleeves or enclosures to prevent damage from moisture or mechanical stress.

Cold splicing is widely used in FTTH deployments, connecting pigtails to installed cables quickly while maintaining reliable optical performance. It is a practical alternative to fusion splicing when speed, cost, and field conditions are priorities.

Cold splicing method for leather cables and pigtails - METRA FIBER MARKET [PDF]

Cold splicing method for leather cables and pigtails
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Related Video Reference

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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