All-Fiber OAM Amplifier With High Purity and Broadband Spectrum Gain Based on Fused Taper Vortex-Beam Coupler

IEEE Photonics Journal

Fufei Pang¹  Jianfei Xing¹  Jianxiang Wen¹  Junfeng Yang¹  Xianglong Zeng¹  Zhenyi Chen¹  Tingyun Wang¹  Xinyu He¹ 

[1] Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China;

关键词: Optical vortices;    optical amplifiers;    fiber-optics amplifiers and oscillators.;   

DOI  :  10.1109/JPHOT.2018.2872040

来源: DOAJ

【 摘 要 】

All-fiber orbital angular momentum (OAM) amplifier with high purity and broadband spectrum gain based on a fused taper vortex-beam coupler (VBC) has been studied. Active and passive few-mode fibers (FMFs), which have similar geometric parameters, are fabricated. A VBC using a single-mode fiber and a passive FMF is designed and fabricated. The VBC can generate the first-order OAM in the range of 1480-1640 nm and its purity up to 91%. Then, an all-fiber vortex amplification system is constructed for the first time, and the first-order OAM is amplified using this system with a low-gain difference (ΔG). The gain exceeds 22 dB at 1549 nm, and its full width at half maximum is approximately 40 nm: 1519-1559 nm. This is a novel all-fiber OAM amplification system with a simple structure and low cost that is applicable in optical communication fields.

【 授权许可】

Unknown