Design of negative curvature fiber carrying multiorbital angular momentum modes for terahertz wave transmission

We design a novel negative curvature fiber (NCF) to support terahertz orbital angular momentum (OAM) modes. Numerical models are constructed to evaluate the transmission performances of vector modes in the frequency range of 0.40-0.80 THz. The designed fiber made from only one kind of heat-resistance resin (HTL) material can support 50-52 OAM modes with large effective index differences above 10(-4) and low confinement loss (in the level of 10(-15) dB/cm). Some other significant characteristics of the designed NCF including waveguide dispersion, OAM purity, and effective mode field area (A(eff)), are also calculated and analyzed with their effects and applications on terahertz OAM guidance. The optimized absolute value of dispersion is between 0.33 and 0.8 ps/ (THz x cm) in the range of 0.45-0.75 THz. The high mode purity (85%-95%) in the range of 0.60-0.80 THz further promotes the mode division multiplexing in OAM fiber. The proposed NCF can offer great potential in high-capacity terahertz communication based on OAM multiplexing.

Automated summary

A novel negative curvature fiber (NCF) has been designed to support terahertz orbital angular momentum (OAM) modes with good transmission performance in the frequency range. The fiber can support a large number of OAM modes with low loss and has been analyzed in terms of waveguide dispersion, OAM purity, and effective mode field area. This NCF shows great potential for high-capacity terahertz communication based on OAM multiplexing.