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Dual-polarization interferometric fiber-optic gyro

A fiber optic gyroscope, polarized light technology, applied in the field of communication, can solve the problems of bending sensitivity, magnetic field sensitivity, and high cost of polarization maintaining fiber optic gyroscope

Inactive Publication Date: 2010-01-20
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings.

[0056]For the convenience of analysis, we first take Figure 4 The unsimplified structure in is illustrated as an example. The light source of the whole system is ASE (Amplified Spontaneous Emission) light source, and the positive direction of the light path is set from left to right. The ASE light source is a broadband light source, and its output light is close to the circular polarization state. After passing through a polarizer, linearly polarized light is obtained, and the optical power loss is about 3dB compared with the light source. The polarization-maintaining beam splitter can use a 50:50 polarization-maintaining coupler, the function of which is to divide the obtained linearly polarized light into two branch optical paths, and maintain the linear polarization in the same direction. The pre-modulation of the two-arm optical path can be amplitude or phase m...

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Abstract

The invention discloses a dual-polarization interferometric fiber-optic gyro which belongs to the field of communication technology. The fiber-optic gyro comprises a light source, two linear polarized light generating circuits, two signal detection light paths, a polarized beam splitter / combiner, a polarization-maintaining coupler, a phase modulator and a polarization-maintaining fiber-optic ring; wherein the light source is connected with the input ends of the two linear polarized light generating circuits by optic fibers; two output ends of the two linear polarized light generating circuits are respectively connected with two ports at the same side of the polarized beam splitter / combiner by optic fibers through one signal detection light path; the port at the other side of the polarized beam splitter / combiner is connected with the polarization-maintaining fiber-optic ring through the polarization-maintaining coupler; and the phase modulator is connected between the polarization-maintaining fiber-optic ring and the polarization-maintaining coupler by optic fibers. Compared with the prior art, the fiber-optic utilizes the dual-polarized light to carry out the detection, thereby greatly improving the measuring precision and the measuring stability of the rotating angular velocity; meanwhile, the fiber-optic gyro has the advantages of simple structure, low cost, small volume, high sensitivity and wide application range simultaneously.

Description

technical field [0001] The invention relates to a dual-polarization interference fiber optic gyroscope, which is a high-stability, high-precision fiber optic gyroscope realized by simultaneously using two polarization states of 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 gyroscopes have the characteristics of compact structure and high sensitivity, but their stability is not as good as some modern mechanical gyroscopes. Due to the needs of the application, the new gyroscope s...

Claims

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Application Information

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IPC IPC(8): G01C19/72
Inventor 王子南王玉杰李正斌
Owner PEKING UNIV
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