Two-hole fiber easy to polarize

The invention discloses two-hole fiber easy to polarize. The two-hole fiber comprises a high-ion-concentration fiber core and a high-purity quartz glass cladding; the fiber core is surrounded by high-concentration metal cations, and the fiber core is of an elliptical structure; the cladding is made from a high-purity quartz glass material, and the average refractive index of the cladding is smaller than that of the fiber core; the cladding is provided with two air holes asymmetrically distributed in the two sides of the fiber core, and the distances from the air holes to the fiber core are D1and D2 respectively, wherein D2 is larger than D1. The manufactured fiber has the advantages that more metal cations surround the fiber core, the dissociation energy is lower, the ions have a relatively larger mobility in the process of thermal polarization, and new charge distribution and a stronger built-in electric field are easily formed in the fiber. 本发明公开了种易于极化的双孔光纤，包括高离子浓度纤芯和高纯石英玻璃包层；所述纤芯周围含有高浓度金属阳离子，且纤芯结构为椭圆形；所述包层