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Research on the Polarization Error and Key Component of Optical Fiber Gyroscope

Author: TangZunWei
Tutor: LouShuQin
School: Beijing Jiaotong University
Course: Optical communication with the mobile communication
Keywords: FOG Transfer matrix Polarization error Coupled mode theory Polarization maintaining fiber coupler Dual-core photonic crystal fiber Broadband coupler Finite Element Method
CLC: TN253
Type: Master's thesis
Year: 2010
Downloads: 165
Quote: 0
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Abstract


FOG is an all-solid-state angular rate measuring instrument based on the Sagnac effect, low cost, small size, light weight, fast startup, large dynamic range, high precision, aviation, aerospace, marine, military and civilian fields with a wide range of applications, to become one of the hot spots of today's fiber-optic sensing field. In order to further improve the the FOG performance, how to effectively reduce the error in the system and the development of high-performance critical devices is essential. The main content of this paper is the polarization error of different optical devices and optical fiber coupler. Polarization error FOG bias stability, different devices FOG output polarization error is of great significance to further optimize the design of the fiber optic gyroscope to improve the performance of the gyro. Jones matrix, the paper uses the optical transmission matrix theory to establish the different optical devices derived expression of the FOG light intensity output, output square wave modulation demodulation phase. Then considered separately the light source fluctuations (including optical power fluctuations and fluctuations in the degree of polarization), the polarization maintaining fiber coupler splitting ratio fluctuations, optical devices pigtail splice point on the axis error due to polarization error, the polarization error caused by different parameters comparison , gives the error tolerance of the light used by the different accuracy gyro device performance parameters. Polarization maintaining optical fiber coupler is a key device of the fiber optic gyroscope and the stability of its splitting ratio by the polarization dependency, wavelength dependency, temperature dependency, and refraction dependence factors. Using coupled mode theory to derive a coupling coefficient of the coupler based on the orthogonality of the polarization maintaining fiber polarization mode gives the coupling coefficient of the polarization maintaining fiber coupler speed shaft. In the numerical calculation based on the polarization maintaining fiber axis errors, wavelength fluctuations, coupling length variation birefringent polarization maintaining fiber coupler splitting ratio affect change on the panda-type Paul. This selection of the production of high-performance fiber optic coupler fiber drawing process, packaging process is important. The dual-core photonic crystal fiber can be applied to broadband coupler. This paper, good design performance of dual-core photonic crystal fiber polarization insensitive the broadband coupler goal, the first to use the finite element method for the numerical analysis of the structure and physical parameters of the dual-core photonic crystal fiber coupling characteristics. Based on the law of numerical analysis obtained, a center hole is an elliptical hole in the new dual-core photonic crystal fiber polarization insensitive broadband coupler and its optimization. This design effectively improving the compatibility of the optical fiber and the feasibility of the experimental drawn.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
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