Yes, OM4 multimode fiber optic cables can be fused together using standard fusion splicing techniques or specialized splice-on connectors.

Fusion Splicing OM4 Fibers

OM4 fiber is a 50-micron core multimode fiber optimized for high-speed data transmission in data centers and LANs, supporting 10 Gbps, 40 Gbps, and 100 Gbps over short to medium distances . Fusion splicing OM4 fibers is technically feasible because the fibers share the same core diameter and are compatible with VCSEL light sources . Proper fusion splicing ensures minimal signal loss and maintains the high bandwidth performance of OM4 cables.

Methods and Considerations

1. Standard Fusion Splicing:
   • OM4 fibers can be spliced using conventional fusion splicers.
   • Care must be taken to align the cores precisely to avoid modal dispersion and insertion loss.
   • Splice loss is typically very low, making fusion splicing suitable for permanent connections or long runs.
2. Splice-On Connectors:
   • Products like the FuseLite® Splice-On Connector allow OM4 fibers to be fused directly to connectors, providing fast, reliable connectivity without the need for splice trays .
   • These connectors are compatible with SC, LC, FC, and ST® interfaces and are ideal for repairs, network restoration, or reflectance-sensitive applications.
3. Mixing Fiber Types:
   • OM4 fibers can be spliced to OM3 fibers without significant performance loss, as both have a 50-micron core .
   • Avoid splicing OM4 to OM1 or OM2 fibers (62.5-micron core) without proper adapters, as this can cause signal loss and reduced transmission distance.

Best Practices

• Use a high-quality fusion splicer calibrated for multimode fibers.
• Clean and cleave fiber ends carefully to ensure low insertion loss.
• Test the spliced fiber for optical loss and reflectance to verify performance.
• When possible, maintain consistent fiber types throughout a channel to maximize bandwidth and minimize attenuation . In summary, OM4 fibers can be fused together either directly with a fusion splicer or via splice-on connectors, and doing so preserves the high-speed performance of the network when proper techniques are followed.