A design method and system for fiber optic gyroscope depolarization optical path

Abstract

The invention belongs to an optical design technique, and relates to a depolarization light path design method of a high-precision fiber gyroscope and a depolarization light path design system. The depolarization light path design method of the fiber gyroscope disclosed by the invention comprises an online measurement module of a wide-spectrum light source spectrum, a calculation module of a light source coherence function, a detection module of coherence function correlation peak and decoherence length and a depolarization scheme design module. The depolarization light path design method comprises the following steps: firstly, judging a correlation peak position of a light source and calculating the light source decoherence length by adopting a corresponding algorithm by online measurement of the spectrum data of each light source; providing design parameters of a depolarization scheme light path, wherein the design parameters comprise a length requirement on each polarization maintaining fiber in a depolarizer, a length requirement on a Y-waveguide tail fiber, and a shaft angle requirement of fusion of the polarization maintaining fiber in the depolarizer. By adopting the design method and the design system, accurate parameters are provided for the structure design of the depolarization light path, the depolarization light path capable of effectively eliminating a gyroscope zero oscillation phenomenon is designed, the product quality and the production efficiency are improved, and the design method and the design system have good practical application values.

Description

technical field [0001] The invention belongs to optical design technology, and relates to a high-precision optical fiber gyroscope depolarization optical path design method and a design system thereof. Background technique [0002] The suppression of polarization error in the fiber optic gyro optical path is one of the key technologies in the development of fiber optic gyro. Due to the inevitable introduction of bending, torsion and winding stress in the gyro optical path (especially the fiber optic ring) during the manufacturing process, the polarization state of the input light wave cannot be maintained in the optical path, and the change of the polarization state causes the output signal of the interferometer to rise. Falling will affect the performance of the gyro. At present, an important means to solve this problem is to use a polarization-maintaining fiber loop, and depolarize or depolarize the light wave input into the fiber coil. Among them, the depolarization sch...

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Problems solved by technology

[0004] However, there are still some problems in the design of high-precision fiber optic gyro depolarization optical path based on SFS light source, mainly in the parameter design of depolarization optical path. The specific performance is as follows: (1) The design of the depolarization structure is based on the coherence length of the optical signal However, for the SFS light source, due to the structural design of the light source, its output spectral shape is usually Gaussian or rectangular, and there are differences between the spectral shapes of each light source, so how to accurately determine the coherence length of each light source is difficult. It must be difficult; (2) If the coherence length of the light source is known, how to select the depolarization scheme according to the coherence length and design the corresponding depolarization structure is a problem worthy of attention

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