Apparatus for manufacturing long period optical fiber gratings having less dependence on polarization and long period optical fiber gratings manufactured by the same

摘要

The present invention relates to a polarization dependence is small long-period fiber grating manufacturing apparatus and a long-period optical fiber grating manufactured by him, regardless of the long-period fiber grating manufacturing unit for polarizing the other end at least one turn for the optical fiber end; Ultraviolet laser light source; And is arranged over the optical fiber, it characterized in that it comprises an amplitude mask for periodically transmitting the light output from the UV laser light source.; In accordance with the present invention, while by applying a twist to the optical fibers in advance when making long-period fiber grating and to rotate the optical fiber is irradiated with UV light to change the refractive index of the fiber core to look at the entire length of the optical fiber can cause the isotropic refractive index change.