Online alignment device of Y-type waveguide chip and polarization maintaining fiber and online alignment method thereof

Abstract

This invention discloses one Y waveguide chip and ensures bias fiber online alignment method, wherein, the device is set with light source, bias fiber, Y waveguide chip, light spectrum device, computer, pair axis feedback module and executive structure to rotate fiber. The invention method comprises the following steps: using light source emission light through Y wave guide chip to connect D point spectrum by the device and to analyze relative function information by use of feedback module; then using said relative function information to analyze Y wave guide chip and the bias fiber and feedback information R to executive structure.

Description

Technical field [0001] The invention relates to a device for aligning a Y waveguide chip and a polarization-maintaining optical fiber on-line and a method thereof. Background technique [0002] The Y waveguide is an important component in the interferometric closed-loop fiber optic gyroscope. It is based on LiNbO 3 The proton exchange method is used on the substrate to obtain an effect similar to that of a single-polarization guided wave, allowing only the TE mode to pass, while preventing the TM mode from passing, so it has a high polarization suppression capability. The polarization-maintaining fiber 3 as the input pigtail of the Y-waveguide chip 4 must be completely aligned with it, that is, the fast and slow axes of the polarization-maintaining fiber 3 are perfectly aligned with the fast and slow axes of the Y-waveguide chip 4 (the fast axis is defined as the x axis and the slow axis is defined as y) In this way, the high polarization suppression capability of the Y-waveguide...

AI Technical Summary

Problems solved by technology

The polarization-maintaining fiber 3 must be completely aligned with the input pigtail of the Y-waveguide chip 4, that is, the fast and slow axes of the polarization-maintaining fiber 3 and the Y-waveguide chip 4 are completely aligned (the fast axis is defined as the x axis, and the slow axis is defined as y), in order to give full play to the high polarization suppression capability of the Y-waveguide chip 4, and if the polarization-maintaining fiber 3 and the Y-waveguide chip 4 cannot align well, a larger polarization cross-coupling will be brought in the fiber optic gyroscope input channel , which affects the output optical power of the Y waveguide chip 4 and the modulation degree of its spectrum, thus bringing a certain impact on the fiber optic gyroscope

[0003] At present, the Y-waveguide input pigtail alignment method used in domestic fiber optic gyroscopes is to artificially adjust the angle by using the relative position of the two stress regions of the input polarization-maintaining pigtail and the cross-section of the Y-waveguide chip under a microscope, which cannot achieve online real-time alignment. Axis, and due to the unsatisfactory shape of the stress area of ​​the polarization maintaining fiber and the Y waveguide chip, the alignment accuracy is not high, the efficiency is low, and the consistency is poor

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