A hollow-core polarization-maintaining photonic crystal fiber

Abstract

The invention relates to an air-core polarization maintaining photonic crystal optical fiber. Along a circle of the inner wall of a glass tube, a plurality of micro capillaries are arranged to form a pore inner covering layer area, the peripheral part of the pore inner covering layer area and the contact part of the inner wall of the glass tube are fixed on the inner wall of the glass tube in a welding mode, the middle part of the pore inner covering layer area is a low refractive index fiber core I, namely a fiber core area, and the two sides of the fiber core area are low refractive index fiber cores II, namely seven-cell pores; the two sides in the fiber core area are gap areas which are enveloped by symmetrical fiber cores; or the upper side and the lower side in the fiber core area are symmetrically provided with convex areas which are enveloped by two fiber cores; or the two sides in the fiber core area are the gap areas which are enveloped by the fiber cores, and the upper side and the lower side in the fiber core area are symmetrically provided with the convex areas which are enveloped by the two fiber cores. The polarization maintaining performance, low-loss transmission and single-model advantages can be achieved, and the air-core polarization maintaining photonic crystal optical fiber has the advantages of being high in temperature stability, low in non-linear coefficient, low in magnetic field sensitivity, good in irradiation resistance and the like.

Description

technical field [0001] The invention belongs to the field of special optical fibers, in particular to a hollow-core polarization-maintaining photonic crystal optical fiber. Background technique [0002] Polarization maintaining fiber is widely used in fiber optic gyroscopes, fiber optic hydrophones, and fiber optic current transformers. Realization of refraction, there are many types such as panda type and bow tie type. However, since the stress rod is composed of doped quartz, its own optical properties are greatly affected by temperature, and in radiation environments such as space, the core doping composition (generally GeO 2 ) and stress rod doping composition (generally B 2 o 3 ) will form a color center under the action of radiation rays, resulting in a significant increase in the loss of the polarization-maintaining fiber and affecting the use. [0003] With the invention of photonic crystal fiber (also known as microstructured fiber), researchers have proposed a ...

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Problems solved by technology

However, since the stress rod is composed of doped quartz, its own optical properties are greatly affected by temperature, and in radiation environments such as space, the core doping composition (generally GeO 2 ) and stress rod doping composition (generally B 2 o 3 ) will form a color center under the action of radiation rays, resulting in a significant increase in the loss of the polarization-maintaining fiber, affecting the use

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