Gap-controlled multi-core terahertz waveguides for integration

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Abstract
Multi-core fibers are pivotal for increasing core density and enabling space-division multiplexing to meet the growing demand for high data transmission rates beyond the limits of single-mode fibers. In the terahertz regime, bundled polymer fibers offer a high-capacity alternative for chip-to-chip links. This work introduces a gap-controlled approach to modulating coupling in solid multi-core terahertz fibers, supported by analytical models and simulations. Experimental validation using 3D-printed cyclic olefin copolymer 1 × 3 fibers demonstrates precise control from −3 dB power splitting to inter-core isolation exceeding −35 dB—sufficient for high-order QAM formats. Rectangular core geometry enables polarization multiplexing, effectively doubling channel capacity, while near-field scanning provides what is believed to be the first spatially resolved visualization of evanescent coupling dynamics. The monolithic design improves integration density by 280% compared to discrete fiber bundles, establishing a scalable framework for high-density terahertz photonic systems.
Funding Information
  • Australian Research Council (LP210200524)
  • National Natural Science Foundation of China (62475011)

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