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Performance Comparison of 12-core Long-Distance Optical Cables

Fiber optic splice closure knowledge brief Published 23 Feb 2025

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

12-core long-distance optical cables offer dramatically higher capacity, longer effective transmission distances, and improved signal efficiency compared to traditional single-core optical cables.Transmission Capacity

Traditional single-core optical fibers transmit data through a single optical path, limiting the total bandwidth per fiber. In contrast, 12-core multicore fibers contain 12 optical transmission paths within the same standard fiber diameter (0.125 mm), enabling spatial multiplexing and significantly increasing total data throughput without increasing cable size . Field experiments have demonstrated 455 terabits per second over 53.5 km and 389 terabits per second over 1,017 km using 12-core fibers with large-scale MIMO signal processing . This represents a 50-fold increase in capacity compared to conventional single-core systems.

Long-Distance Transmission

Traditional single-core fibers are limited by attenuation and dispersion over long distances, requiring frequent repeaters or amplifiers. The 12-core long-distance optical cables have been successfully tested over 7,280 km, simulating transoceanic submarine cable conditions, while maintaining accurate signal demodulation through advanced 24 x 24 MIMO algorithms that compensate for crosstalk and non-uniform delays . This allows stable, high-capacity transmission over intercontinental distances, which is challenging for conventional single-core fibers.

Signal Quality and Crosstalk

Adding multiple cores in a single fiber introduces crosstalk, where signals from adjacent cores interfere with each other. Traditional single-core fibers do not face this issue. The 12-core fibers mitigate crosstalk using coupled-core design and advanced MIMO signal processing, enabling accurate separation of multiplexed signals even under long-haul conditions . This ensures high signal integrity despite the increased number of cores.

Practical Deployment

12-core fibers are designed to maintain the same outer diameter as conventional fibers, allowing compatibility with existing cable infrastructure and mass production techniques . They can be deployed in both terrestrial and submarine networks, including high-density cables with multiple cores, without significantly increasing bulk or installation complexity. Traditional fibers are simpler to deploy but cannot meet the growing demand for high-capacity networks, especially for 5G, AI, and inter-data center communications.

Summary of AdvantagesFeatureTraditional Single-Core Fiber12-Core Multicore FiberTransmission Paths112Maximum CapacityLimited by single coreUp to 50x higher (hundreds of Tbps)Long-Distance PerformanceRequires frequent amplificationStable over 7,280 km with MIMO processingCrosstalkMinimalManaged via coupled-core design and MIMODeploymentStandard, simpleCompatible with existing infrastructure, higher complexity in terminal equipmentUse CaseShort to medium distance, lower bandwidthLong-haul, high-capacity, submarine and terrestrial networks

In conclusion, 12-core long-distance optical cables represent a major advancement over traditional single-core fibers, offering exponentially higher capacity, long-distance stability, and efficient use of existing fiber infrastructure, making them ideal for next-generation networks in the Beyond 5G/6G era .

Performance Comparison of 12-core Long-Distance Optical Cables - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

Performance Comparison of 12-core Long-Distance Optical Cables

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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