应用于三轴光纤陀螺中的双程后向ASE光源

根据三轴光纤陀螺的高精度需求,采用大功率高稳定性的高精度双程后向方案掺铒光纤光源。通过对ASE光源的理论分析建立数学模型,并根据所用掺铒光纤及泵浦光源的参数对光源进行谱型分析,确定光路方案。再以掺铒光纤和泵浦激光器的温度特性和补偿为研究重点,对掺铒光纤的长度和掺杂浓度以及泵浦功率和铒纤的匹配性进行试验,最终采用铒纤长度19 m,泵浦波长974.6 nm,泵浦功率140 m A,得到光源光功率为20 m W,平均波长变化量小于0.5′10~(-6)/℃,满足光纤陀螺对ASE光源的要求。

Double-pass backward ASE light source for three-axis FOG

According to the high-precision requirements of three-axis fiber optic gyro, a double-pass backward ASE (amplified spontaneous emission) light source with high-power and high-accuracy was adopted. The ASE light source’s mathematical mode was established based on theoretical analysis, and the spectral shape was analyzed in experiments based on the parameters of erbium-doped fiber and pump laser to determine its optical path program. Then the erbium-doped fiber’s length and doping concentration as well as the match ability of pump power and erbium-doped fiber was tested based on the stuies on the temperature characteristics and compensation of erbium-doped fiber and pump laser, etc. Test results show that excellent performance of 20mW light source power is obtained by using 140mW pump power, 974.6nm pump wavelength and 19m erbium-doped fiber, and the average wavelength change is less than 0.5?10?6/℃, meeting the FOG’s requirements.