Low-noise dual-polarization interference optic fiber gyroscope

Abstract

The invention discloses a low-noise dual-polarization interference optic fiber gyroscope belonging to the technical field of communication. The optic fiber gyroscope comprises a light source, two linear polarized light generating circuits, two circulators, a polarizing beam splitter / combiner, a 3 multiplied by 3 polarization-preserving coupler, two photoelectric detectors, a phase modulator and apolarization-preserving optical fiber ring, wherein the light source is connected with input ends of the two linear polarized light generating circuits through optical fiber; two output ends of the two linear polarized light generating circuits are respectively connected with the optical fiber of two ports at one side of the polarizing beam splitter / combiner through the circulator; the port at theother side of the polarizing beam splitter / combiner is connected with the polarization-preserving optical fiber ring through the 3 multiplied by 3 polarization-preserving coupler; and the polarization-preserving optical fiber ring and the polarization-preserving coupler are connected with the phase modulator through optical fiber. Compared with the prior art, the optic fiber gyroscope realizes the inhibition of noise sensitivity by using the symmetry of the 3 multiplied by 3 polarization-preserving coupler and meanwhile is characterized by simple structure, low cost, small volume, high sensitivity and wide application range.

Description

technical field [0001] The invention relates to a fiber optic gyroscope, in particular to a low-noise dual-polarization interference fiber optic gyroscope, which uses a 3×3 polarization-maintaining coupler instead of a common 2×2 polarization-maintaining coupler, and combines two polarization states The invention relates to a low-noise, high-stability, and high-precision fiber optic gyroscope realized by simultaneously using light for sensing, and belongs to the technical field of communication. Background technique [0002] A gyroscope is a rotational sensor used to measure the rotational angular velocity of the carrier on which it is mounted. Gyroscopes are widely used in the guidance of various aircraft and weapons, and various precision measurements in industry and military. There are three types of common gyroscopes: mechanical gyroscopes, laser gyroscopes, and fiber-optic gyroscopes (Fiber-optic gyroscope, FOG). The latter two are optical gyroscopes. Optical gyrosco...

AI Technical Summary

Problems solved by technology

However, in engineering applications, polarization-maintaining fiber optic gyroscopes still have problems such as high cost, sensitivity to bending, and sensitivity to magnetic fields.

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