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Method and device for realizing pi/2 initial phase locking in non-polarization-maintaining Sagnac type interferometer

An initial phase and interferometer technology, applied in Sagnac effect gyroscopes and other directions, can solve problems such as complex adjustment methods, and achieve the effects of reducing the nonlinear effect of optical fibers, clear adjustment directions, and simple adjustment processes.

Active Publication Date: 2022-04-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent publication number: CN111337009A, publication date: 2020-06-26, discloses that in a non-polarization-maintaining Sagnac interferometer, by adjusting multiple polarization controllers and using PBS and BD for differential detection, π / 2 can also be realized simultaneously The initial phase difference and the maximum fringe contrast, so that the sensor system works in an optimal state, but the adjustment method is more complicated

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  • Method and device for realizing pi/2 initial phase locking in non-polarization-maintaining Sagnac type interferometer
  • Method and device for realizing pi/2 initial phase locking in non-polarization-maintaining Sagnac type interferometer
  • Method and device for realizing pi/2 initial phase locking in non-polarization-maintaining Sagnac type interferometer

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Embodiment 1

[0081] A method for realizing π / 2 initial phase difference locking in a non-polarization-maintaining Sagnac type interferometer, said method comprising the following:

[0082] The broadband light source inputs linearly polarized light along the fast axis or slow axis of the depolarizer to obtain two beams of incoherent and orthogonal linearly polarized light; two beams of incoherent and orthogonal linearly polarized light are also called broadband after depolarization Light;

[0083] The two beams of linearly polarized light are input into the first circulator, and the CCW light in the counterclockwise direction and the CW light in the clockwise direction are obtained through the closed-loop optical path structure or the open-loop optical path structure; the closed-loop optical path structure and the open-loop optical path structure both have Functions of polarization scrambling, motorized polarization control, and ultrasonic signal waveform excitation;

[0084] Using the fir...

Embodiment 2

[0130] Based on the method for realizing π / 2 initial phase difference locking in a non-polarization-maintaining Sagnac interferometer described in Embodiment 1, this embodiment provides a method for realizing π / 2 initial phase difference locking in a non-polarization-maintaining Sagnac interferometer. The device of the phase difference locking method, such as figure 1 As shown, the device includes a broadband light source depolarizer, a first circulator, a first 1*2 coupler, an open-loop structure with functions of polarization scrambling, motorized polarization control, and ultrasonic signal waveform excitation, a polarization controller, and a polarization Beam splitter, 1*2 optical switch, photodetector, balance detector;

[0131] The broadband light source, the depolarizer, and the first circulator are connected in sequence, and the bidirectional port of the circulator is connected to the input port of the first 1*2 coupler;

[0132] The first 1*2 coupler is connected to ...

Embodiment 3

[0152] Based on the method for realizing π / 2 initial phase difference locking in a non-polarization-maintaining Sagnac interferometer described in Embodiment 1, this embodiment provides a method for realizing π / 2 initial phase difference locking in a non-polarization-maintaining Sagnac interferometer. The device of the phase difference locking method, such as image 3 As shown, the device includes a broadband light source, a depolarizer, a first circulator, a first 1*2 coupler, an open-loop structure with functions of polarization scrambling, motorized polarization control, and ultrasonic signal waveform excitation, a polarization controller, Polarizing beam splitter, 1*2 optical switch, photodetector, balanced detector;

[0153] The broadband light source, the depolarizer, and the first circulator are connected in sequence, and the output port of the circulator is connected to the input port of the first 1*2 coupler;

[0154] The first 1*2 coupler is connected to the open-lo...

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Abstract

The invention provides a method for realizing pi / 2 initial phase difference locking in a non-polarization-maintaining Sagnac type interferometer. The method comprises the following steps: inputting a broadband light source into a depolarizer to obtain two beams of incoherent and orthogonal linearly polarized light; the linearly polarized light is input into the first circulator and passes through the closed-loop light path structure or the open-loop light path structure to obtain CCW light in the anticlockwise direction and CW light in the clockwise direction; the CCW light in the anticlockwise direction and the CW light in the clockwise direction are combined to form an interference light field, and the interference light field is output by an output port of the first circulator; a photoelectric detector channel is gated by an optical switch, an interference signal of a synthetic interference light field is observed, adjustment is performed by using the scrambling function of the closed-loop light path structure or the open-loop light path structure, and a maximum value and a minimum value during scrambling are recorded; the electric polarization control function is adjusted under the static condition, so that the light intensity of the synthesized interference light field is located in the middle position of the maximum value and the minimum value when the scrambling function works; an ultrasonic signal waveform is excited, a balance detector channel is gated by an optical switch, and differential detection of light intensity is carried out by using a polarization beam splitter and a balance detector.

Description

technical field [0001] The present invention relates to the technical field of fiber optic gyroscopes, and more particularly relates to a method and device for realizing π / 2 initial phase difference locking in a non-polarization-maintaining Sagnac interferometer. Background technique [0002] Sagnac interferometer can be used as a sensor of various physical quantities, such as laser ultrasonic detection [Ulrich R, Johnson M. Fiber-ring interferometer: polarization analysis [J]. Optics Letters, 1979,4 (5): 152-154], has many Potential application value, but the current technology development is immature, and there are not many technologies that can be put into practical use and become products, especially for non-polarization-maintaining Sagnac interferometers, because the change of polarization state is random and difficult to control , is an insurmountable problem at present. [0003] Solving this problem is of great significance for the commercialization and wide applicat...

Claims

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Application Information

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IPC IPC(8): G01C19/68
Inventor 蔡志岗王自鑫赵伟鸿王福娟王嘉辉李佼洋黄柱源张铭琛
Owner SUN YAT SEN UNIV