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Study of Resonance Fiber Optic Gyroscope

Author: GuoWei
Tutor: JinZhongHe
School: Zhejiang University
Course: Microelectronics and Solid State Electronics
Keywords: Fiber optic gyroscope Resonant Basic research Interferometric Fiber Optic Gyro Laser linewidth Sensitivity limit Coupling coefficient Optical resonator Micro - optical gyroscope Ring Laser Gyro
CLC: TP212
Type: Master's thesis
Year: 2003
Downloads: 426
Quote: 6
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Abstract


Fiber optic gyroscope (FOG) is an advanced instrument to measure the angle velocity of rotation body. It realizes the measurement of optical Sagnac effect using solid all-fiber structure. It overcomes mechanical-electrical gyro and ring laser gyro’s reduction of dynamic performance and life-span caused by the structure or the requirement of high rotation rate mass. And it solves the fabrication technology complication and high cost caused by the rigid requirement of optical circuit resonation. So it becomes the most competitive new type of gyroscope. The interference FOG is in the application process. The resonation FOG needs shorter fiber or waveguide to realize the same sensitivity,comparing with the interference FOG. It can realize integration in silicon planar waveguide module and integration of ring cavity,input and output optical circuits and modulator in single chip of planar waveguide. It fits the RMOG very much,which stands for the trend of miniaturization of gyroscope.In this thesis,the theory of resonation FOG is analyzed first. The resonation characteristic of the key component-resonation cavity and the sensitivity limit of resonation FOG are analyzed deeply. The mutual relationship between the sensitivity limit and both the laser dimension and the coupling coefficient is mainly analyzed,considering the laser dimension,coupling coefficient of the coupler and the resonation cavity loss. The production mechanism of the main noise factors in the resonation FOG is analyzed subsequently. The compensation methods of some kinds of noises which we care are induced.In this thesis,a novel structure of silicon-based passive ring waveguide resonation cavity is firstly introduced and designed. The design is combined with the MEMS technology,which gets rid of the curved waveguides in the previous waveguide ring resonation cavity and facilitates optical integration. The structure has characteristic of "the smaller the resonation cavity,the smaller the loss",which has a promising future of miniaturization and fits the field of resonation RMOG.A kind of system structure of resonation FOG is brought forward based ontheoretical analysis. The design of optical circuits and test electric circuits is finished based on the system requirement. The transfer function of the optical circuits is analyzed and the system test principle is discussed. The performances of key optical components are tested under current condition of our laboratory. The electric circuits are tested and the parameters are set. The initial test of the resonator is finished. Such tests show that each part of design can basically satisfy the system design requirement.

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