5-tube hollow-core anti-resonant fiber with ultralow loss and single mode

Zhao, Xingtao; Wu, Xuanrui; Lan, Xiaobo; Luo, Jie; Zhang, Lei; Xiang, Jingliang; Ma, Wenbo; Wang, Shutao

doi:10.1016/j.optcom.2021.127347

Cited by 19 publications

(6 citation statements)

References 41 publications

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“…Figure 1(a) shows the proposed ber structure. The core has a diameter Dc = 35 µm and all cladding tubes have the same wall thickness t = 0.4 µm which satis es the anti-resonance condition [21]. These values will remain xed in the calculations presented below.…”

Section: Structural Design Of Ncfstmentioning

confidence: 99%

“…Another noteworthy parameter for characterizing the transmission properties of optical bers is the bending loss. The bending loss can be calculated using the equivalent refractive index of the bent optical ber n eq , which satis es the following equation [21]: n eq = n(x,y)e (x,y)/Rb . Here, n(x, y) represents the equivalent refractive index of the straight ber, and R b is the bend radius.…”

Section: Bending Loss Performances Of Ncfstmentioning

confidence: 99%

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A Hollow-Core Anti-Resonant Fiber with Ultralow Loss and Fourfold Semi-Tube Design

zhao,

Cheng,

et al. 2024

Preprint

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A novel hollow-core anti-resonant fiber with negative curvature fourfold semi-tube (NCFST-ARF) is proposed. It has the advantages of simple structure and fourfold rotational symmetry. The confinement loss of NCFST-ARF is less than 0.03 dB/km in the wavelength range of 1.3–1.7 µm and only 0.0165 dB/km at 1.55 µm. Meanwhile, the ratio between minimum higher-order mode loss (Min HOM loss) and fundamental mode loss (FM loss) can reach 41000, which shows excellent single-mode operation. Moreover, the effect of the ellipticity of anti-resonance element on confinement loss is analyzed in detail. Our numerical study shows the ellipticity of inner tube has little effect on the transmission loss and single-mode characteristics of the fibers. In the analysis of manufacturing tolerances, the influence of wall thickness of the suspended glass layer and the deformation of inner tube on fiber properties is also discussed.

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Section: Structural Design Of Ncfstmentioning

confidence: 99%

Section: Bending Loss Performances Of Ncfstmentioning

confidence: 99%

A Hollow-Core Anti-Resonant Fiber with Ultralow Loss and Fourfold Semi-Tube Design

zhao,

Cheng,

et al. 2024

Preprint

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“…Research progress on bending loss in the near-infrared band has been relatively successful. In 2022, Zhao et al [12] designed a nested hollow-core fiber with a bending loss of 0.001 dB/m at a minimum bending radius of 50 mm and a wavelength of 1.55 μm. In the same year, Liu et al [13] designed an AR-HCF with a glass sheet nested structure and calculated that its bending loss of LP01-LP31 mode is less than 3.0×10 -4 dB/m in the wavelength range of 1.4-1.61 μm when the bending radius is 60 mm.…”

Section: Introductionmentioning

confidence: 99%

Mid-Infrared 2.79 μm Band Er, Cr: YSGG Laser Transmission Anti-Bending Low-Loss Anti-Resonant Hollow-Core Fiber

Huang,

Wang,

Wang

et al. 2024

Preprint

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A large core size and bending resistance are very important properties of mid-infrared energy transfer fibers, but large core sizes usually lead to a deterioration of bending properties. A negative-curvature nested node-free anti-resonant hollow-core fiber (AR-HCF) based on quartz is proposed. It was made by adding a nested layer to a previous AR-HCF design to provide an additional anti-resonance region while keeping the gap between adjacent tubes strictly correlated to the core diameter to produce a node-free structure. These features improve the fiber’s bending resistance while achieving a larger core diameter. The simulation results show that the radial air-glass anti-resonant layer is increased by the introduction of the nested anti-resonant tube, and the weak interference overlap between the fiber core and the cladding mode is reduced, so the fiber core’s limiting loss and the sensitivity to bending are effectively reduced. When the capillary wall thickness t of the fiber is 0.71 μm, the core diameter D is 70 μm, the ratio of the inner diameter of the cladding capillary to the core diameter d/D is 0.62, and the diameter of the nested tube is d0=29 μm, the fiber has a lower limiting loss at the wavelength of 2.79 μm, and the limiting loss is 3.28×10-4 dB/m. At the same time, the optimized structure also has good bending resistance. When the bending radius is 30 mm, the bending loss is only 4.72×10-2 dB/m. To our knowledge, this is the first research to achieve an anti-bending low-loss micro-structure hollow fiber with a bending radius of less than 30 mm in the 2.79 μm band. An anti-bending low-loss anti-resonant hollow-core fiber with this structure constitutes a reliable choice for the light guiding system of a 2.79 μm band erbium laser therapy instrument.

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“…The spectral region centered at 5.4 μm is important for the CO laser, an alternative light source in the mid-IR region for material processing and spectroscopy [17]. Various NCF structures such as tubular [11], elliptical [18,19,34], lotus-shaped [35], conjoined-tube [36], double-ring [37], adjacent nested [38], nested compounded [39], double nested [40,41], and bar supported NCFs [41][42][43][44] have been reported to improve the transmission losses of hollow-core structures. Although several studies on bar-supported structures have been reported, they are mainly focused on light guidance in either the near-IR or terahertz (THz) regions.…”

Section: Introductionmentioning

confidence: 99%

Nested multibar cladding elements in negative curvature fibers for CO laser guidance

Khan,

Ordu

2023

Phys. Scr.

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A numerical study on the multi-bar nested cladding design of chalcogenide glass-based negative curvature hollow-core fiber was carried out to achieve a low-loss light guidance in the mid-infrared spectrum centered at 5.4 μm. Fiber design parameters were systematically optimized, and the effect of the nested bars on the confinement and total loss performance of a five-tubular cladding structure was investigated. An ultra-low transmission loss of 0.112 dB km−1 at 5.4 μm was achieved with As2Se3 triple-bar negative curvature fiber while maintaining low bending sensitivity. The design is also suitable for high transmission performance with alternative infrared glasses and can be potentially used for low-loss light guidance in a wide mid-infrared spectrum.

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5-tube hollow-core anti-resonant fiber with ultralow loss and single mode

Cited by 19 publications

References 41 publications

A Hollow-Core Anti-Resonant Fiber with Ultralow Loss and Fourfold Semi-Tube Design

A Hollow-Core Anti-Resonant Fiber with Ultralow Loss and Fourfold Semi-Tube Design

Mid-Infrared 2.79 μm Band Er, Cr: YSGG Laser Transmission Anti-Bending Low-Loss Anti-Resonant Hollow-Core Fiber

Nested multibar cladding elements in negative curvature fibers for CO laser guidance

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