Polarization-maintaining dispersion-compensation microstructure fiber

A polarization-maintaining dispersion-compensation microstructure fiber, wherein pure silica glass is used as a base material;

• the fiber comprises an inner core, a single-layer air-hole array surrounding the inner core, an inner cladding air-hole array, an air-hole array in an outer core, a single-layer air-hole array surrounding the outer core, and an outer cladding air-hole array;
• the single-layer air-hole array surrounding the inner core and the inner cladding air-hole array are collectively referred to an air-hole array in a first area;
• the air-hole array in the outer core, the single-layer air-hole array surrounding the outer core, and the air-hole array in the outer core are collectively referred to an air-hole array in a second area;
• the air-hole array in the first area includes 3 rows of air holes arranged in a square lattice arrangement with an adjacent air hole spacing Λ;
• in the first area, two air holes in a middle row are omitted to form the inner core;
• a midpoint of a line connecting centers of the two omitted air holes are defined as a coordinate original point;
• an axis connecting the centers of the two omitted air holes is defined as y-axis;
• an axis passing through the original point and perpendicular to the y-axis is defined as the x-axis;
• a diameter of the air holes in the single-layer air-hole array surrounding the inner core is d1;
• the air holes in the air-hole array in the second area are arranged in square lattice arrangement with the adjacent air hole spacing Λ;
• the second area contains two sub-areas that are located outside the first area in the x-direction;
• the air-hole arrays in the first and second areas are separated by Λ along x-direction, and dislocated by Λ/2 along y-direction;
• two outer cores are respectively located in the two sub-areas of the second area and are symmetrically distributed with respect to the y-axis;
• the two outer cores have an identical structure;
• each of the two outer cores contains the air-hole array in the outer core and each air-hole array in the outer core comprises two air holes with a diameter d3;
• four air holes with the diameter d3 are located on a positive x-axis and a negative x-axis respectively, with distances of 3Λ and 4Λ measured from the centers of the air holes to the original point, respectively;
• a diameter of the air holes in the single-layer air-hole array surrounding the outer core is d2;
• a diameter of the air holes in the inner cladding air-hole array and the outer cladding air-hole array are both d4;
• the four diameters satisfy the relationship of d1>d2>d4>d3.