In this study,we propose and demonstrate an all-fiber orbital-angular-momentum(OAM)mode encoding system,where through helical fiber gratings(HFGs),binary symbols are encoded to or decoded from two OAM modes with topol...In this study,we propose and demonstrate an all-fiber orbital-angular-momentum(OAM)mode encoding system,where through helical fiber gratings(HFGs),binary symbols are encoded to or decoded from two OAM modes with topological charges(TCs)of-1 and+1,respectively.We experimentally validate that the OAM mode generated by a clockwise-helix HFG(cHFG)can be converted back into fundamental mode by using an HFG with a helix orientation opposite to that of the cHFG,i.e.,ccHFG.Benefited from utilization of the HFGs,the proposed OAM mode encoding system has a low cost,low insertion loss,high mode conversion efficiency,and polarization independence.To the best of our knowledge,this is the first demonstration of the HFGs-based all-fiber OAM mode encoding/decoding scheme,which may find potential applications in optical communication and quantum communication as well.展开更多
基金National Key Research and Development Program of China(2023YFB2804900)National Natural Science Foundation of China(62375134)+2 种基金Japan Society for the Promotion of Science(JP24K21609,JP23K22816)Amano Institute of TechnologyNatural Science Research of Jiangsu Higher Education Institutions of China(22KJB510030)。
文摘In this study,we propose and demonstrate an all-fiber orbital-angular-momentum(OAM)mode encoding system,where through helical fiber gratings(HFGs),binary symbols are encoded to or decoded from two OAM modes with topological charges(TCs)of-1 and+1,respectively.We experimentally validate that the OAM mode generated by a clockwise-helix HFG(cHFG)can be converted back into fundamental mode by using an HFG with a helix orientation opposite to that of the cHFG,i.e.,ccHFG.Benefited from utilization of the HFGs,the proposed OAM mode encoding system has a low cost,low insertion loss,high mode conversion efficiency,and polarization independence.To the best of our knowledge,this is the first demonstration of the HFGs-based all-fiber OAM mode encoding/decoding scheme,which may find potential applications in optical communication and quantum communication as well.
