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A method and device for phase modulation of an optical fiber Sagnac interferometer

A phase modulation, interferometer technology, applied in Sagnac effect gyroscopes and other directions, can solve the problems of fiber optic gyroscope cost and reliability impact

Active Publication Date: 2021-04-23
李卫 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This requires a long fiber loop and a very high operating frequency of the phase modulator, which has an impact on the cost and reliability of the fiber optic gyroscope

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  • A method and device for phase modulation of an optical fiber Sagnac interferometer
  • A method and device for phase modulation of an optical fiber Sagnac interferometer

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Embodiment Construction

[0019] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a technical solution for phase modulation of a Sagnac interferometer, and the implementation cost is low.

[0020] The purpose of the present invention is to achieve through the following technical measures:

[0021] Firstly, two Faraday rotation optical devices with opposite rotations and equal rotation angles are used to respectively rotate the two polarized lights incident from the optical path of the fiber Sagnac interferometer.

[0022] The polarization directions of the two lines of polarized light incident in the optical path of the fiber Sagnac interferometer are the same, in order to ensure that the two lines of polarized light entering the phase modulator involved in the present invention maintain the same polarization direction as when leaving the phase modulator, therefore It is required that the above two Faraday rotation devices have opposite rotations and equal...

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Abstract

The invention provides a method and device for phase modulation of an optical fiber Sagnac interferometer. The two linearly polarized lights with the same polarization direction incident in the optical path of the instrument; the electro-optic crystal device is placed in the above two Faraday optical rotation devices; the optical rotation angle of the above two Faraday optical rotation devices and the polarization direction of the polarized light incident on it from the outside are controlled, The polarization direction of the outgoing light is rotated to the two main axis directions of the electro-optic crystal due to the electrically induced birefringence; the electro-optic phase delay of the electro-optic crystal is modulated by the change of the external modulation voltage, so that the phase modulation from different ports The phase difference of the linearly polarized light of the filter is modulated.

Description

technical field [0001] The invention relates to an optical phase shifting device, in particular to a phase modulator used in an optical fiber Sagnac interferometer. Background technique [0002] In the past decades, fiber optic Sagnac interferometers have made enviable achievements in the practical application of fiber optic gyroscopes and fiber optic current sensors. Taking the fiber optic gyroscope as an example, whether it is in an open-loop or a closed-loop fiber optic gyroscope, a phase modulator must be used to modulate the phase of the light in the fiber optic gyroscope's optical path. At present, the phase modulators used in fiber optic gyroscopes are mainly PZT piezoelectric ceramic phase modulators and lithium niobate phase modulators. Both phase modulators are essentially based on a fiber ring with a fixed time delay between two beams of light traveling in opposite directions. This requires a long fiber loop and a very high operating frequency of the phase modul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/72
Inventor 李卫齐跃峰李思佳
Owner 李卫