Hollow anti-resonance optical fiber

Abstract

The invention discloses a hollow anti-resonance optical fiber. A Fano resonance phenomenon can be effectively avoided by arranging a U-shaped glass structure 5 in a capillary tube 4 and enabling a contact node of the capillary tube 4 to be far away from a fiber core region 1 so that the optical fiber has a stable loss spectrum characteristic, and a relatively large transmission bandwidth is obtained; and the relatively large transmission bandwidth is ensured, the cavity of the capillary tube 4 is divided into the first type of holes 6 and the second type of holes 7 by adjusting the U-shaped glass structure 5 so that the areas of the cavities of the capillary tube 4 and the U-shaped glass structure 5 are uniformly distributed, the leakage between two glass layers (high refractive index layers) can be smaller, and an optical fiber loss is further reduced.

Description

technical field [0001] The present invention relates to the technical field of optical fiber communication, and more specifically, to a hollow-core anti-resonant optical fiber. Background technique [0002] With the rapid development of the global Internet, Internet of Things, data centers, artificial intelligence and other fields, new application scenarios continue to emerge. For example, unmanned driving, cloud computing, VR / AR, etc. have led to an exponential increase in global IP business traffic, and its information transmission is heavily dependent on the transmission rate and transmission capacity of the communication system, making people put forward higher requirements for the transmission performance of the communication network. need. However, due to the inherent defects of materials, solid optical fibers have problems such as Rayleigh scattering, material dispersion, and Kerr nonlinearity, which make it difficult to further reduce the transmission loss of existi...

AI Technical Summary

Problems solved by technology

However, if figure 1 As shown, the existing rod structure hollow anti-resonance optical fiber fixes the small capillary inside the large capillary through the glass rod, adding an additional anti-resonance layer to reduce the loss of the fiber. At the same time, the glass rod is connected to the large and small capillaries, resulting in Fano resonance. Oscillation occurs due to loss, and the transmission bandwidth is thus limited and narrowed

[0004] Another example is the optical fiber structure disclosed in the patent "a low-loss hollow-core anti-resonant optical fiber" (publication date 2020.07.31, publication number CN111474627A) filed in China, such as figure 2 As shown, it proposes the design of multi-layer hollow anti-resonant fiber for the low loss of optical fiber. The combined capillary and arc-shaped layer are fixed in the cladding region of the fiber, so that multiple anti-resonant layers can confine the optical field of the core, thereby Reduce the transmission loss, but the combined capillary will introduce nodes, which will inevitably cause loss spectrum oscillation, which limits the transmission bandwidth range

[0005] It can be seen that in the existing hollow-core anti-resonant fiber design, additional glass structures are added to reduce the loss, but these newly added glass structures increase the contact nodes for transmitting optical signals, and the nodes close to the core will cause significant Fano The resonance phenomenon causes its loss spectrum to oscillate and change, thereby reducing the transmission bandwidth and narrowing the working wavelength range

However, if the newly added glass structure is placed at the end of the capillary farther from the core, and only one contact point is reserved, a larger transmission bandwidth can be obtained, but at the same time it will affect the increase in fiber loss.

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