用于高精度光纤陀螺的光纤放大器光源

Fiber amplifier source for high accurate fiber-optic gyroscope

介绍了应用于光纤陀螺的掺铒光纤超荧光光源的研究现状,比较分析了掺铒光纤光源5种主要结构的优缺点,在此基础上得出了光纤放大器结构的光源既可以有效提高光纤陀螺的检测精度和稳定性,又可以降低成本。针对光纤放大器光源,分别分析了泵浦功率、泵浦波长、反馈以及铒纤温度对其平均波长稳定性的影响。为了消除反馈对光纤放大器光源平均波长稳定性的影响,根据超荧光光源的偏振态效应,在光源中加入了偏振器来控制反馈的偏振态,从而降低了反馈对光源平均波长稳定性的影响,并采用长周期光纤光栅作为滤波器,有效地提高了光纤放大器光源的波长稳定性。

The latest researches and developments on the Erbium doped superfluorescent fiber source was briefly introduced. The advantage and disadvantage of five typical kinds of source structures were compared and analyzed,from which a conclusion was obtained that the measurement precision and stability of fiber-optic gyroscope could be improved by adopting the fiber amplifier source,and the cost could be reduced. Based on fiber amplifier source,the influences of pump power,pump wavelength,feedback from FOG and temperature of Er-doped fiber on the source mean wavelength were analyzed respectively. To eliminate the influence of feedback on the mean wavelength,a polarizer was acceded to the source according to the effect of polarization dependent gain of superfluorescent fiber source. Eventually,the influence was reduced greatly. Meanwhile,a long term fiber grating was also adopted as the fiber source,and the stability of the mean wavelength of the fiber amplifier source was improved greatly.