In order to solve the problem of insufficient transmission capacity caused by the rapid growth of information

we propose and investigate a new type of optical fiber is proposed for photon Orbital Angular Momentum（OAM）transmission.The PCVD technique is used to solve the problem of stress damage of optical fiber preform with high refractive index circular core structure.Through repeated process research and verification

the high steady fiber drawing technology suitable for ring core fiber is demonstrated to manufacture the fiber successfully.The fiber has a ring structure with ± 1 and ± 2 order OAM signal transmission at the same time.The fiber transmission loss can still maintain a relatively small level

which can meet the longer scale OAM large-capacity signal transmission.