Topological photonics provides an unprecedented way to control wave propagation that can eliminate backscattering. However, due to the bulk-boundary correspondence inherent in topological physics, the desired topological state usually manifests at the boundary rather than within the bulk, resulting in a sizeable useless bulk area and hindering applications. Here, we present a unique topological photonic crystal fiber (TPCF) by incorporating a one-dimensional bivortex line within a three-dimensional bilayer photonic crystal, where adjacent layers exhibiting π-phase vortex differences generate artificial spins. The spin-core states along the fiber core and their robust spin-momentum locking against disorders are demonstrated in microwave experiments. Besides the single-mode fiber, we also construct a multimode TPCF. Our research may empower photonic crystal fibers with topological band structures, advancing future high-performance communication devices.

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• Defects
• Topological effects in photonic systems
• Photonic crystal waveguide
• Band structure methods