A new designed dual-guided ring-core fiber for OAM mode transmission

• A new designed dual-guided ring-core fiber for SDM transmission is proposed.
• The ring region support OAM mode and the core region hold the fundamental mode across the whole C band.
• Fiber features such as dispersion, differential mode delay, effective mode area, power isolation and modal birefringence have been analyzed comprehensively.

We propose and analyze a design of multi-OAM-modes ring-core fiber with two guided modes regions which possess relatively large effective index separations required for the vector modes transmission. The proposed fiber can support up to 28 information states bearing OAM spanning 8 OAM orders in the ring region, and two degenerate fundamental polarization modes in the core region across the whole C bands. Fiber features such as dispersion, differential mode delay, effective mode area, power isolation between two guided regions and modal birefringence have been analyzed in this paper. For the reason that the proposed fiber possess the relatively good features, it has potential applications in the next generation fiber communication systems either in the quantum domain or in the classical domain.