Multicore Fiber Splicing: Low Fusion Splice Loss Technique

Feb 2026 | News

The exponential increase in global data traffic driven by cloud computing, IoT, AI, and 5G is placing unprecedented strain on conventional single-core optical fiber systems. Multicore fiber (MCF) technology presents a viable pathway to overcome these limitations by substantially enhancing transmission capacity, energy efficiency, and network scalability. Extensive worldwide field trials have demonstrated the feasibility of MCF, supported by progress in fan-in/fan-out devices for backward compatibility, multicore transceivers, connectors, and optical amplifiers. These advancements make MCF an attractive candidate for deployment in both data center interconnects and long-haul backbone networks. 

One of the primary advantages of MCF is the ability to support higher bandwidth and data rates, which are critical for the deployment of 5G and the evolution toward 6G networks. These networks must handle massive numbers of connected devices, including smartphones, IoT endpoints, and autonomous systems. By increasing perfiber capacity, MCF helps alleviate the bandwidth constraints inherent in conventional singlecore fiber systems. 

MCF also contributes to improved energy efficiency and a reduced physical footprint in telecommunications infrastructure, since fewer fibers are needed to achieve a given capacity target. This reduction can lower both installation costs and ongoing operational expenses, supporting more sustainable network expansion strategies for service providers. 

 

FITEL S185PMROF and S185EVROF (with End-View function) fusion splicers deliver industryleading performance for multicore fiber (MCF) splicing. Using automatic rotational alignment and a splice time of 90 seconds, the splice loss for a 4core fiber is reduced to 0.02-0.03 dB when using a 3electrode fusion splicer.  

 

For more information, please have a look at the white paper which FITEL / Furukawa published in 2023

MulicoreFiberSplicing
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