Orthogonal Bragg gratings excited by single-mode reflection peaks in multi-mode no-core fibers inscribed with a femtosecond laser for vector bend sensing.

• Tác giả: Fengyi Chen, Tianxin Duan, Xingyong Li, Rongsheng Liu, Xueguang Qiao, Ruohui Wang
• Ngôn ngữ: eng
• Thông tin xuất bản: United States : Optics letters , 2025
• Bộ sưu tập: NCBI
• ID: 707416

Tóm tắt

In this Letter, we propose the use of a femtosecond laser (FL) plane-by-plane (Pl-b-Pl) method to achieve narrowband single-mode reflection peak excitation directly in multi-mode no-core fibers (NCFs). The effects of different grating offsets on grating reflectivity were verified. We inscribed orthogonal fiber Bragg gratings with an offset distance of 15