Axis alignment method for direct coupling of polarization maintaining optical fiber ring terminal and integrated optical chip

Abstract

The invention discloses an axis alignment method for direct coupling of a polarization maintaining optical fiber ring terminal and an integrated optical chip. Direct coupling of the polarization maintaining optical fiber ring terminal and the integrated optical modulator chip is achieved through two coupling processes of end face observation of the polarization maintaining optical fiber ring terminal and clamping of a coupling clamp. By means of the technical scheme, the problem that the performance of the fiber-optic gyroscope is degraded due to the fact that additional optical nonreciprocalerrors are generated due to the melting point in the fiber-optic gyroscope is solved, the precision and speed of coupling angle error identification are improved, and accurate control over the coupling angle of the polarization axis is achieved.

Description

technical field [0001] The invention belongs to the technical field of coupling and packaging of integrated optical chips, and in particular relates to an axis alignment method for direct coupling of a polarization-maintaining optical fiber ring terminal and an integrated optical modulator chip. Background technique [0002] In the manufacturing process of the fiber optic gyroscope, the connection of the fiber optic ring and the multifunctional integrated optical modulator can be realized by the method of pigtail fusion. The fusion splicing process requires a certain length of pigtail, and the coiling of the pigtail will affect the performance of the fiber optic gyroscope in some applications. For high-precision fiber optic gyroscopes, improving performance is the main appeal of this type of gyroscope. An important means of improving performance is to minimize the fiber optic ring. The non-reciprocal error in the combination of multi-functional integrated optical modulator (...

AI Technical Summary

Problems solved by technology

[0004] The difficulty of direct coupling is that the surface of the fiber terminal of the polished fiber ring needs to be protected, which makes the alignment between the polarization maintaining fiber and the Y waveguide chip and the optimization of optical power monitoring more difficult. Optical power monitoring can be carried out by building an optical system similar to a fiber optic gyroscope Monitoring, the alignment between the polarization maintaining fiber and the Y-waveguide chip is difficult to deal with. At present, there are not many direct coupling technology solutions. Usually, the geometric end face of the fiber terminal is barely aligned or the complex imaging system is used for online observation. The above two methods It will bring problems of low alignment accuracy (coupling polarization crosstalk higher than 30dB requires an alignment angle error of less than 0.5°), low coupling efficiency, and difficult system implementation

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