Jiacheng Hu, Yuying Wang, Kuen Yao Lau, Xuhu Han, Sergei Firstov, Lijing Zhong, Yiping Wang, Jianrong Qiu
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引用次数: 0
Abstract
Laser direct writing (LDW) is versatile in structuring fibers with micro-sized functional elements such as fiber Bragg grating (FBG) and backscattering centers by finely manipulating back and side scattering from laser-induced refractive index modified (RIM) points. However, the side-scattering is a lesser-explored property in laser-structured fibers. In this work, a concise physical model is established to understand the side-scattering as a combined effect of microstructure and geometry of RIM points. Based on a single-pulsed LDW method, the parametric decoupling between scattering loss (α) and coupling strength (κ) coefficients of FBGs is reported, whose cross-section is customized to have a flattened ellipse with thoroughly positive RIM, enabling controllable reflectivity from −21.33 dB to −0.0018 dB while maintaining narrow bandwidth and low loss. Exemplarily, a designed FBG realizes ultra-low loss of 0.008 dB with a resonance attenuation of 10.81 dB, exhibiting a record-breaking κ/α of 2083. Using this FBG as the high-reflective mirror of a home-made bismuth-doped fiber laser, narrow-band lasing with a high optical signal-to-noise ratio of ≈43 dB is achieved, demonstrating flexibilities of the proposed approach in customizing both back- and side-scattering in fibers and opening up wide opportunities for combining multifunctional components into optical fibers and realizing all-fiber networks.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.