A Low Magnetic Sensitivity Polarization Maintaining Photonic Crystal Fiber

Abstract

The present invention discloses a low-magnetic sensibility polarization-maintaining pohotonic crystal fiber, and relates to the technical field of new materials. The low-magnetic sensibility polarization-maintaining pohotonic crystal fiber comprises a fibre core and an air hole area and a quartz cladding which coat the fibre core in order from inside to outside, the air hole area comprises 4 firstair holes and a plurality of air holes, the inner diameter of each first air hole is larger than the inner diameter of each second air hole, the four first air holes are uniformly arranged around thefibre core and are distributed in a rhombus mode. The air hole area comprises a first air hole loop and a second air hole loop around the first air hole loop, the first air hole loop is internally provided with two first air holes, and the second air hole loop is internally provided with two first air holes. The low-magnetic sensibility polarization-maintaining pohotonic crystal fiber can effectively reduce the internal torsion when the fiber is pulled and achieve the purpose of reduction of magnetic sensibility.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a polarization-maintaining photonic crystal fiber with low magnetic sensitivity. Background technique [0002] In an ideal circular core single-mode fiber, there is no circular birefringence, so the Faraday phase error between the two counterpropagating light waves in the fiber coil is zero, but this is only in the ideal state of the fiber ring, that is, the light in the fiber ring This is true only when the polarization state in is not changed. The magneto-optical Faraday effect is that when the linearly polarized light passes through a transparent medium under the action of a magnetic field, the polarization angle of the linearly polarized light will rotate, resulting in an optical rotation phenomenon under the action of a magnetic field. Due to the magneto-optic Faraday effect, in single-mode fiber The middle magnetic field changes the phase of the left and right circul...

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Problems solved by technology

In addition, when the polarization-maintaining fiber is looped, the main axis of the fiber will rotate to a certain extent, which will also cause the intrinsic polarization mode of light to no longer be a standard linear polarization state, so the magnetic sensitivity error of the fiber optic gyroscope cannot be zero

In the axial magnetic field environment, in the Faraday effect, the vertical component of the magnetic field perpendicular to the direction of light propagation will not form the Faraday effect, but because there is a certain bending after the fiber is wrapped around, the vertical component of the magnetic field will make the bending fiber with The mode parallel to the bending plane has non-reciprocity, resulting in phase error, which will inevitably introduce twist in the process of drawing the fiber and winding the fiber ring, and the twist will cause the component of the mode parallel to the bending plane to change, resulting in a Gyro axial magnetic susceptibility error, and the conventional stress-type polarization maintaining fiber due to the existence of the pressure zone, the inherent twist is inevitable due to the existence of the stress zone when the fiber is drawn

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