Anti-resonance ring fiber supporting multiple orbital angular momentum modes

Abstract

The invention relates to an anti-resonance ring fiber supporting multiple orbital angular momentum modes, which comprises a fiber base, a ring fiber core, cladding air holes and negative curvature glass tubes, wherein the cladding air holes are annularly arranged on the outer wall of the ring fiber core; the negative curvature glass tubes are annularly arranged on the outer layers of the claddingair holes. All modes are bound to the ring fiber core through total reflection, and the mode binding ability is enhanced by the anti-resonance effects of the negative curvature glass tubes. The refractive index distribution of the ring fiber core is matched with the energy distribution of the orbital angular momentum mode, the effective refractive index difference between eigenvector modes in thefiber can be effectively adjusted, and through designing the tube wall thickness and the size of the ring fiber core, the mode number and the mode separation degree are controlled. The thickness of the negative curvature glass tubes has anti-resonance effects on light propagation, and a cut-off condition for vector modes is realized. Short-distance large-capacity mode-division multiplexing transmission without multiple-input multiple-output digital signal processing can be realized.

Description

technical field [0001] The invention belongs to the field of optical fiber communication and relates to an anti-resonance ring optical fiber supporting multiple orbital angular momentum modes. Background technique [0002] Space-division multiplexing and mode-division multiplexing technologies are two effective means to expand transmission capacity today. In many space-division multiplexing applications, multi-core fiber is the most direct multiplexing method, and a 19-core fiber with low crosstalk has been reported. But this design is difficult to scale, because expanding the cladding diameter to accommodate more cores or reducing the core spacing to increase core density will have a negative impact on fiber performance. The former will make the fiber easier to break, while the latter will bring greater inter-core crosstalk. Compared with multi-core optical fiber, few-mode optical fiber based on mode division multiplexing is a more integrated implementation. However, for...

AI Technical Summary

Problems solved by technology

However, the complex structure of traditional optical fibers leads to complicated manufacturing processes

Moreover, traditional optical fibers will be doped with other materials, which are easily affected by the ambient temperature.

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