Generation of the First-Order OAM Modes in Ring Fibers by Exerting Pressure Technology

• Main Authors: Yu Zhang, Fufei Pang, Huanhuan Liu, Xiangqing Jin, Sujuan Huang, Yingchun Li, Jianxiang Wen, Zhenyi Chen, Min Wang, Tingyun Wang
• Format: Article
• Language: English
• Published: IEEE 2017-01-01
• Series: IEEE Photonics Journal
• Subjects: Orbital angular momentum; ring fiber.
• Online Access: https://ieeexplore.ieee.org/document/7870568/
• ISSN: 1943-0655

We have proposed an effective method of generating the first-order orbital angular momentum (OAM) modes in ring fibers. The first-order OAM modes (L = ±1) can be represented as the linear superposition of the HE₂₁^even mode and the HE₂₁^odd mode. Through exerting pressure on the ring fiber by a leverage device, the fundamental mode HE₁₁ can be coupled into higher order mode HE₂₁in broadband wavelength ranging from 1530 to 1600 nm. By adjusting the fiber polarization controller and the pressure value exerted on the fiber, both the positive (L = +1) and negative (L = - 1) OAM modes can be generated separately. Moreover, we have demonstrated that the coupling efficiency from the fundamental mode to the first-order OAM modes at wavelength of 1550 nm can reach 67%.