Abstract
Vortex beams have attracted attention due to their unique properties and wide applications. In this paper, a novel scheme for generating the first-order orbital angular momentum (OAM) modes based on anti-resonant reflecting guidance mechanism in ring-core fibers (RCFs) is proposed and experimentally demonstrated. By directly fusion splicing with the standard single-mode fiber (SMF), anti-resonant reflecting guidance of guided-core modes in RCF can be basically motivated. Consequently, the excited modes can well transmit inside the low-refractive-index central core of the RCFs with exhibiting a Gaussian field distribution (defined as the anti-resonant mode, AR mode). Because of different mode coupling coefficients under external pressure on the RCF, these AR modes can be coupled to the HE11 and HE21 modes, respectively. Results show that, by adjusting the polarization state of injected light beams as well as the pressure on the RCF, OAM modes with topological charge numbers of both the positive (L = +1) and negative (L = -1) can be separately generated at efficiencies of 63.2% and 61.7%, respectively
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
