泵浦功率对掺铒光纤光源性能影响的实验研究

Experimental study on the dependence of DPB SFS′ performance on pump power

超荧光掺铒光纤光源技术是高精度光纤陀螺的关键技术之一,其优劣直接影响陀螺的性能。在完成铒纤长度优化设计的基础上,实验分析了泵浦功率对掺铒光纤光源平均波长以及带宽的影响,同时在-20￣60℃的温度范围内,测量了不同泵浦功率条件下掺铒光纤光源平均波长、带宽和输出功率随温度的漂移。实验结果表明,当泵浦功率在60￣120 mW范围内时,平均波长受泵浦功率的影响约为-6.5 ppm/mW,可以根据光纤陀螺对输出功率和带宽大小的要求在此范围内选择合适的泵浦功率。最终装配样机的平均波长的长期稳定性(6 h)达到5 ppm(峰-峰值),短期稳定性(1 h)达到2 ppm,可以在此基础上定制合适的光纤光栅滤波器,对ASE光谱进行滤波,使谱形满足高精度光纤陀螺的要求。

Erbium-doped superfluorescent fiber source technology is one of the key technologies of the high-precision fiber-optic gyroscope （FOG）.The performance of the source influences the FOG＇s scale factor and bias stability directly. Based on the optimum Erbium-doped fiber length has been fixed, the experimental investigation of the influence of pump power＇s fluctuation on DPB SFS＇s mean wavelength and linewidth were presented. Meanwhile the shifts of mean wavelength, linewidth and output power with temperature for several pump power were measured in this work by rapidly cycling the soure temperature between -20-60 ℃. The experimental results are as follows, when pump power in the range of 60-120 mW, the influence of pump power＇s fluctuation on DPB SFS＇s mean wavelength is -6.5 ppm/mW.Appropriate pump power can be selected in this range. Finally, the sample＇s mean wavelength stability reached 5 ppm（peak-to-peak）in 6 h,it can reach 2 ppm for short time （1 h）.The proper fiber Bragg grating to tailor the ASE spectrum are designed so that the width and shape of the spectrum can satisfy the high-precision FOG＇ s request.