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<p>Multimode optical fibers have various applications in many fields, including high-power laser delivery, short-haul telecommunications and sensing, etc. Hollow-core anti-resonant fiber (HC-ARF) has attracted considerable attention as an ideal optical transmission medium with great potential in these application domains. This paper presents a method to enhance the performance of multimode hollow-core fibers by adjusting the conjoined tubes in the cladding to form an elliptically nested conjoined tube based on the theory of inhibited coupling and modified Marcatili-Schmeltzer mode index expression. This configuration allows for greater flexibility in adjusting the air layer within the cladding tube, thereby enlarging the phase mismatch between the air modes in the cladding and the higher-order modes in the core, leading to enhanced inhibited mode coupling. Numerical simulations were performed on the designed fiber. After optimization, the proposed fiber can still support 8 different spatial mode groups even at a bending radius of 7&#xa0;cm with a bending loss of less than 5 × 10<sup>− 5</sup> dB/m and can support 12 different spatial mode groups having confinement loss less than 5 × 10<sup>− 4</sup> dB/m when straight at a wavelength of 1&#xa0;μm.</p>

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Design and performance analysis of a novel low confinement loss multimode hollow-core anti-resonant fiber

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Guomao Zheng,
  • Wenxiong Lan,
  • Yuheng Zhang,
  • Changming Xia,
  • Jiantao Liu,
  • Zhiyun Hou,
  • Guiyao zhou

摘要

Multimode optical fibers have various applications in many fields, including high-power laser delivery, short-haul telecommunications and sensing, etc. Hollow-core anti-resonant fiber (HC-ARF) has attracted considerable attention as an ideal optical transmission medium with great potential in these application domains. This paper presents a method to enhance the performance of multimode hollow-core fibers by adjusting the conjoined tubes in the cladding to form an elliptically nested conjoined tube based on the theory of inhibited coupling and modified Marcatili-Schmeltzer mode index expression. This configuration allows for greater flexibility in adjusting the air layer within the cladding tube, thereby enlarging the phase mismatch between the air modes in the cladding and the higher-order modes in the core, leading to enhanced inhibited mode coupling. Numerical simulations were performed on the designed fiber. After optimization, the proposed fiber can still support 8 different spatial mode groups even at a bending radius of 7 cm with a bending loss of less than 5 × 10− 5 dB/m and can support 12 different spatial mode groups having confinement loss less than 5 × 10− 4 dB/m when straight at a wavelength of 1 μm.