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�������պ����ѧѧ�� 2005, Vol. 31 Issue (11) :1159-1162    DOI:
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��Զ��, ���, ��С��, ��Ω��*
�������պ����ѧ ������ѧ���繤��ѧԺ, ���� 100083
High precision fiber optic gyroscope based on Er-doped superfluorescent fiber source
Yang Yuanhong, Wang Zheng, Yi Xiaosu, Zhang Weixu*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ��Ը߾��ȹ������ݵ�����,����һ����1?550?nm���γ�������Ľ�ֹ�ͱ�Ĥ�˲������Ƴ������ܵIJ��ﳬӫ����˹�Դ,ͨ������ȷ�����˲�������������,��-40��~+60����¶ȷ�Χ��,��Դ���IJ����ȶ���Ϊ2.58×10-6��,��������ȶ�������1��.�о������ֹ�Դ��ǿ������,������һ��������������Թ������ݵ�������������,�������ݵ��������ϵ����СԼ20��.�ڴ˻�����,���Ƴ��߾��ȱջ�ȫ��ƫ������������.Allan���������ʾ,���Ƴ���������ƯΪ��0.004?5(°)/��h���������ϵ��Ϊ0.003?5(°)/h 1 2 ������������С��11×10-6,��������߾���½�ù���ϵͳ��Ҫ��.
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Abstract�� For high precision fiber optic gyroscope application, high performance Er-doped superfluorescent fiber source was demonstrated and a practical prototype with 2.58×10-6�� mean wavelength stability and less than 1% output power instability within -40��~+60�� was made with a cut-off type thin film filter which reflect long wavelength light within 1?550?nm band and the optimal parameters obtained by simulating. The source relative intensity noise was measured and analysed. A close loop all digital fiber optic gyroscope prototype was made using this source. With a noise subtracting technology, the noise in fiber optic gyroscope was reduced and the random walk coefficient decreased about 20% .The whole performance of this gyroscope prototype was tested and the bias drift of the fiber optic gyroscope prototype is 0.004?5(°)/h and the random walk coefficient is 0.003?5(°)/h 1 2 according to the result of Allan variance analysis and its scale factor error is less than 11×10-6. This is satisfied the demand of land inertial system.
Keywords�� gyroscopes   fiber optic   Er-doped superfluorescent fiber source   relative intensity noise     
Received 2004-07-28;
About author: ��Զ��(1969-),��,�����人��,����, yhyang@buaa.edu.cn.
��Զ��, ���, ��С��, ��Ω��.���ڲ��ﳬӫ����˹�Դ�ĸ߾��ȹ�������[J]  �������պ����ѧѧ��, 2005,V31(11): 1159-1162
Yang Yuanhong, Wang Zheng, Yi Xiaosu, Zhang Weixu.High precision fiber optic gyroscope based on Er-doped superfluorescent fiber source[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(11): 1159-1162
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