Polarization-independent orbital angular momentum generator based on a chiral fiber grating Zhang, Yan ; Bai, Zhiyong ; Fu, Cailing ; Liu, Shen ; Tang, Jian ; Yu, Jian ; Liao, Changrui ; Wang, Ying ; He, Jun ; Wang, Yiping Abstract Publication: Optics Letters Pub Date: January 2019 DOI: 10.1364/OL.44.000061 Bibcode: 2019OptL...44...61Z