FRM-based light source relative intensity noise cancellation structure

A technology of relative intensity noise and light source, applied in Sagnac effect gyroscopes and other directions, can solve the problem of relative intensity noise of light source, and achieve the effect of less pigtails, fewer optical devices, and lower losses

Inactive Publication Date: 2019-05-07
BEIHANG UNIV
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Problems solved by technology

[0012] Aiming at the problem of the relative intensity noise of the light source, the present invention proposes a reasonable and easy-to-implement FRM-based light source relative intensity noise cancellation structure

Method used

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  • FRM-based light source relative intensity noise cancellation structure
  • FRM-based light source relative intensity noise cancellation structure
  • FRM-based light source relative intensity noise cancellation structure

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Embodiment Construction

[0024] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0025] Such as figure 1 Shown is the optical path structure of the FRM-based light source relative intensity noise cancellation scheme of the present invention, including ASE (amplified spontaneous emission) light source, 2×2 polarization maintaining coupler, Faraday rotating mirror FRM, Y waveguide integrated optical device, polarization maintaining Fiber optic loops and detectors. The four connection ends of the 2×2 polarization maintaining coupler are respectively connected with the ASE light source, the Y waveguide integrated optical device, the Faraday rotating mirror and the detector. The optical signal of the ASE light source is input into the 2×2 polarization-maintaining coupler to form polarized light, which is divided into two equal paths. One path of light is input into the Y-waveguide integrated optical device as signal light and div...

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Abstract

The invention provides a FRM-based light source relative intensity noise cancellation structure, and belongs to the technical field of fiber optic gyros. The structure of the invention comprises an ASE light source, a single polarization 2*2 polarization-maintaining coupler, a Faraday rotating mirror (FRM), a Y-waveguide integrated optical device, a polarization-maintaining fiber loop, and a detector, wherein the light from the ASE light source becomes a polarized light passing through the 2*2 polarization-maintaining coupler, and is then divided into two beams, of which one is used as a signal light and the other one a as reference light; the signal light is divided into two beams through the Y-waveguide integrated optical device into the fiber loop for interference, the reference light passes through the FRM such that the polarization state is rotated by 90 degrees and reflected, and the reference light and the reflected light combine to enter the detector. The reference light and the interference light of the invention have a certain time difference, and the polarization states are perpendicular to each other with no interference occurring when the lights are combined, so that the optical power is increased, and the suppression of the relative intensity noise is completed.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, in particular to a light source relative intensity noise cancellation structure based on FRM (Faraday Rotator Mirror, Faraday Rotator Mirror). Background technique [0002] In the high-precision fiber optic gyroscope, the light source used is a rare-earth-doped superfluorescent fiber optic light source. The output power of this light source is high, and the optical power reaching the gyro detector can reach tens of microwatts. The high output power is conducive to improving the optical fiber gyroscope. However, in the experiment, it was found that with the increase of the output optical power of the fiber optic light source, the signal-to-noise ratio of the output signal of the fiber optic gyro detector did not increase as expected. This phenomenon is due to the relative intensity noise in the photocurrent. (RIN), when the output power of the light source reaches the order of tens ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72
Inventor 徐宏杰王夏霄刘昕张春熹宋凝芳郑月孔令海
Owner BEIHANG UNIV
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