Spectrum design of multimode fiber Bragg gratings based on suppression of mode coupling

被引:0
作者
Yang, Qianglong [1 ]
Tao, Haiyan [1 ]
Kong, Mei [1 ]
Xu, Yameng [1 ]
机构
[1] Changchun Univ Sci & Technol, Sch Phys, 7089 Weixing Rd, Changchun 130022, Peoples R China
基金
中国国家自然科学基金;
关键词
FEMTOSECOND LASER; FUSED-SILICA; TEMPERATURE; INSCRIPTION; FABRICATION; SENSOR; ANGLE;
D O I
10.1364/AO.521550
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The direct femtosecond laser inscription method is very competitive in the fabrication of fiber Bragg gratings, but its refractive index modification region is very limited and leads to low reflectivity and wide spectra of multi- mode fiber gratings. In this work, the relationship between the refractive index modification region, the coupling coefficient, and the spectrum of the multimode fiber grating is investigated based on the intrinsic mechanism of mode coupling; thus the annular and eccentric elliptic refractive index modification regions are accordingly proposed to suppress mode couplings in the multimode fiber Bragg grating, so as to achieve a highly discrete spectrum and narrow spectrum of the multimode fiber Bragg grating, respectively. This work can provide a solid theoretical foundation for the spectrum design of the multimode fiber Bragg grating, which can be utilized to customize the spectrum according to application scenarios such as optical communication, fiber lasers, filtering, and sensing. (c) 2024 Optica Publishing Group
引用
收藏
页码:5867 / 5875
页数:9
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