In this article, a high-sensitivity surface plasmon resonance (SPR) sensor based on multimode fiber (MMF)-tapered hollow core fiber (THCF)-MMF structure is fabricated and proposed for refractive index ...

All-fiber orbital angular momentum (OAM) amplifier with high purity and broadband spectrum gain based on a fused taper vortex-beam coupler (VBC) has been studied. Active and passive few-mode fibers ...