All-fiber acousto-optic frequency shifter and all-fiber heterodyne measurement system applying all-fiber acousto-optic frequency shifter

Abstract

The invention proposes an all-fiber acousto-optic frequency shifter and an all-fiber heterodyne measurement system applying the all-fiber acousto-optic frequency shifter, wherein the all-fiber acousto-optic frequency shifter includes a Bragg grating fiber, an aluminum cone and piezoelectric ceramics, the piezoelectric ceramics is fixedly adhered on the bottom plane of the aluminum cone, there is an angle in a range of 1.11 degrees to 1.15 degrees between the top plane and the bottom plane of the aluminum cone, and the top plane of the aluminum cone is vertically adhered on an end face of the Bragg grating fiber. A reflectance spectrum of the all-fiber acousto-optic frequency shifter changes with respect to a reflectance spectrum of an all-fiber acousto-optic frequency shifter under the action of an existing typical acoustic wave of a transverse flexural wave or an acoustic wave of a longitudinal wave, so that the all-fiber acousto-optic frequency shifter has higher reflectivity with the same driving power. The manufacturing cost of the all-fiber acousto-optic frequency shifter is reduced, while the power consumption is reduced, so that problems of a complicated structure, low coupling efficiency and a small modulation range and other problems of an existing all-fiber acousto-optic frequency shifter are solved.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to an all-fiber acousto-optic modulation frequency shifter and an all-fiber heterodyne measurement system using the frequency shifter. Background technique [0002] Heterodyne technology uses two channels of light with different frequencies to interfere, and the obtained interference signal contains information such as the phase, amplitude and frequency of the two channels of light. When the state of one of the channels of light changes, the interference signal can be sensitively and efficiently compared to Changes are detected. The acquisition method of two different frequencies of light in the heterodyne system is usually to split the light emitted by the laser, and shift the frequency of one of the lights, and then make the two lights interfere, so as to obtain the interference light with high signal-to-noise ratio Signal. The frequency shifting method usually u...

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Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the present invention proposes an all-fiber acousto-optic modulation frequency shifter to solve the problems of the existing all-fiber acousto-optic modulation frequency shifter with complex structure, low coupling efficiency, and small modulation range.

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