Antiresonant hollow-core fiber Bragg grating design

Area of Science:

• Photonics
• Optical Fiber Technology
• Materials Science

Background:

• Fiber Bragg gratings (FBGs) are crucial for optical sensing and communication.
• Hollow-core fibers (HCFs) offer unique properties for gas photonics and light-matter interactions.
• Conventional FBG inscription methods are incompatible with HCFs due to light confinement in the hollow core.

Purpose of the Study:

• To propose a novel hollow-core fiber design for efficient FBG inscription.
• To demonstrate the feasibility of creating high-performance FBGs in HCFs.
• To enhance the capabilities of hollow-core fiber-based matter cells for gas photonics applications.

Main Methods:

• Design of a bi-thickness dual-ring hollow-core antiresonant fiber (DRHCF).
• Numerical simulations to analyze mode overlap between the fundamental mode and cladding glass.
• Evaluation of FBG reflectivity and insertion loss using standard inscription techniques.

Main Results:

• The proposed DRHCF design achieves significant overlap between the fundamental mode and cladding glass.
• Feasibility of creating high-reflection FBGs in DRHCFs demonstrated through numerical investigations.
• Expected device length <1 cm and insertion loss <0.3 dB.

Conclusions:

• The DRHCF design overcomes limitations of traditional FBG inscription in HCFs.
• FBGs in HCFs can be effectively realized, enhancing light-matter interaction length.
• This advancement holds potential to revolutionize gas photonics and related fields.