A low-loss radiation-resistant birefringent photonic crystal fiber

Abstract

A low-loss radiation-proof birefringent photonic crystal fibre, comprising a central fibre core (1). The central fibre core (1) comprises a pure silicon fibre core (11) and a deep fluorine-doped concave inner cladding (12) coating the outside of the pure silicon fibre core (11). An air pore layer (2) and a quartz cladding (3) successively coat the outside of the central fibre core (1) from inside to outside. The outside of the quartz cladding (3) is coated with a coating layer (4). The air pore layer (2) comprises four layers of rings composed of air pores from inside to outside. The first layer of rings is composed of two large air pores (21) and a plurality of small air pores (22). The second, third and fourth layers of rings are all composed of the plurality of small air pores (22). The air pores of the four layers of rings are all arranged in a regular hexagonal manner. All the air pores are connected by means of a quartz connecting wall. The fibre realizes birefringence, and at the same time has low-loss and radiation-proof performances, and satisfies the usage requirements in special environment application occasions, such as aerospace.

Description

technical field [0001] The invention relates to the field of photonic crystal fibers, in particular to a low-loss anti-irradiation birefringence photonic crystal fiber. Background technique [0002] High birefringent optical fibers are widely used in communication, sensing and other fields. Optical fiber sensing technology with polarization maintaining optical fiber as the core component, especially fiber optic gyroscope technology and fiber optic hydrophone technology have received more attention. Polarization-maintaining fiber has excellent birefringence effect, which increases the difference in propagation constants of the two orthogonal constituent modes HEx11 and HEy11 of the fundamental mode transmitted inside it, and reduces the coupling probability of these two orthogonal modes, thus in It maintains its polarization state well when transmitting linearly polarized light. With the in-depth development from amplitude modulation to phase or polarization state modulatio...

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Problems solved by technology

[0005] However, the existing photonic crystal fiber is still limited to a simple replacement of the performance of the conventional polarization-maintaining fiber, that is, a good birefringence effect can be achieved through the arrangement of air holes to replace the birefringence effect of the conventional polarization-maintaining fiber

For the reduction of fiber loss and the improvement of radiation resistance performance, there are still certain restrictions, so that the existing photonic crystal fiber cannot meet the use requirements of special environmental applications such as aerospace and aviation. Therefore, it has not been available for a long time. Practical research results of birefringent photonic crystal fibers suitable for the development of higher-precision fiber optic gyroscopes

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