Broadband and stable linearly polarized mode converter based on polarization-maintaining fiber long-period grating

被引：6
|
作者：
Jiang, Chen [1 ,2 ]
Liu, Yunqi [1 ]
Wan, Ying [1 ]
Lin, Yanlv [1 ]
Mou, Chengbo [1 ]
Ma, Yuehui [1 ]
Zhou, Kaiming [2 ]
机构：
[1] Shanghai Univ, Shanghai Inst Adv Commun & Data Sci, Key Lab Specialty Fiber Opt & Opt Access Networks, Joint Int Res Lab Specialty Fiber Opt & Adv Commu, Shanghai 200444, Peoples R China
[2] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England
来源：
OPTICS AND LASER TECHNOLOGY | 2022年 / 152卷
基金：
中国国家自然科学基金;
关键词：
Polarization-maintaining fibers; Long-period gratings; Mode converter; OAM mode generator; Dispersion turning point; ANGULAR-MOMENTUM GENERATION; VORTEX; BEAMS;
D O I：
10.1016/j.optlastec.2022.108159
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate a broadband and stable linearly polarized mode converter by inscribing long-period grating (LPG) in few-mode polarization-maintaining fibers (FPMFs). The operating wavelength of the mode converter at 1.0- and 1.5- mu m waveband has been achieved by using PMF with different cut-off wavelengths. Theoretical and experimental demonstrated broadband linearly polarized mode conversion can be achieved with a maximum 10 dB bandwidth of 140- and 189- nm at 1.0- and 1.5- mu m waveband respectively due to the turning point coupling mechanism. Then, we propose and demonstrate a controllable linearly polarized orbital angular momentum (LPOAM) mode generator using a single LPG-based mode converter and a length of FPMF. The LP-OAM mode is produced by turning axial strain and can be smoothly switched between +/- 1 order. Our all-FPMF based grating fabrication offers a new option towards a stable and broadband polarized mode converter and LP-OAM mode generator for application in a few-mode fiber laser and communication system.
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收藏
页数：8
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