公开(公告)号：US11536895B2

公开(公告)日：2022-12-27

申请号：US17297647

申请日：2018-11-28

Applicant: SHENZHEN UNIVERSITY

Inventor： Zhiyong Bai ,  Yan Zhang ,  Yiping Wang ,  Cailing Fu ,  Shen Liu

IPC: G02B6/02 ,  G02F1/133 ,  G02F1/1333

Abstract: A polarization-independent orbital angular momentum modulator based on a chiral fiber grating, a method for manufacturing the same, and an orbital angular momentum beam generator. The orbital angular momentum modulator includes an optical fiber body having a spiral fiber structure, and the spiral fiber structure has a long-period optical fiber grating effect. The optical fiber body has a periodic spiral refractive index modulation in an axial direction. A period of the spiral refractive index modulation has a magnitude of hundreds of microns, and the spiral refractive index modulation is distributed in an axial direction, a radial direction, and an angular direction of the optical fiber body, and configured to excite a spiral phase to generate an orbital angular momentum beam.