A multi-resonator hollow-core fiber

Abstract

A multi-resonant layer hollow-core optical fiber of the present invention comprises a ring-shaped dielectric tube, a first type of hole is arranged at the inner center of the ring-shaped dielectric tube, and several groups of arc-shaped dielectric layers are arranged around the first type of hole, and A rectangular dielectric layer is arranged on the inner side of the arc-shaped dielectric layer, and a second type of hole is arranged between two groups of arc-shaped dielectric layers in the same arc direction. The third type of hole is formed between the dielectric layers, the fourth type of hole is formed between two adjacent rectangular dielectric layers, the first type of hole, the second type of hole, the third type of hole and the fourth type of hole form a low refractive index area, The arc-shaped dielectric layer, the rectangular dielectric layer and the ring-shaped dielectric tube form a high refractive index area. Beneficial effects: the damage threshold of the optical fiber is increased; the limited loss of the optical fiber is reduced, which is beneficial to obtain low limited loss characteristics; and is beneficial to obtain optical transmission with high bandwidth and low loss.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a multi-resonance layer hollow-core optical fiber. Background technique [0002] The anti-resonant hollow-core fiber has less strict requirements on the periodicity of the air holes in the cladding, and can obtain ultra-wide transmission bandwidth by controlling the resonant coupling wavelength. Therefore, the anti-resonant hollow-core fiber has low and high manufacturing process requirements. In order to obtain high-quality optical fiber transmission characteristics, it is necessary to overcome the adverse effects of nodes at the junction of each unit in the fiber cladding and avoid loss in the anti-resonance window. The appearance of the peak improves the loss and dispersion characteristics of the fiber. At the same time, in order to reduce the transmission loss of optical fibers, researchers have proposed anti-resonant hollow-core optical fibers with various structu...

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Problems solved by technology

Later, it was found that nesting multi-dielectric tubes inside the dielectric tubes of the reflective layer can reduce the confinement loss to be lower than the surface scattering loss, but it is difficult to precisely control the size and position of each dielectric tube under the existing manufacturing process. The wall thickness of the two dielectric tubes in the optical fiber cladding is quite different, and the position and size of the small dielectric ring are different, which affects the characteristics of the optical fiber (from: [W.Belardi, "Design and properties of hollow antiresonant fibers for the visible and near infrared spectral range," J. Lightw. Technol., 32, 4497~4503, (2015)】)

Chinese patent application No. 201710954172.6 discloses a hollow-core anti-resonant optical fiber with multiple resonant layers. Adding a thin-walled layer to the capillary of the fiber cladding or using a capillary as a supporting component to increase the fiber cladding can reduce the fiber loss, but the above method The nodes in the fiber cladding are increased, thus causing too many cladding modes, and precise adjustments are required in the fiber manufacturing process to avoid the influence of the cladding modes at the nodes

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