为优化双程后向结构的掺铒光源, 分析了光纤长度、泵浦功率和温度的变化对光源平均中心波长的影响, 初步确定了掺铒光纤长度的优化范围, 并在全温度范围内进行实验验证。实验选用的980 nm泵浦源电流为110 mA, 掺铒光纤的长度为12.5 m, 该装置的输出功率为13.26 mW, 光源的平均波长稳定性为0.6 ℃-1。通过建立光谱分布优化仿真模型, 实现输出光谱的近高斯分布, 3 dB带宽达到32 nm。经过优化后得到的掺铒光纤光源具有输出功率高、平均波长稳定性好、输出光谱呈高斯分布等优势, 是高精度光纤陀螺的理想光源。

In order to improve the performance of Erbium-doped fiber source with double-pass backward structure, experiments are carried out to analyze the influence of fiber length, pump power and temperature on the average center wavelength and confirm the initial optimization fiber length ranges. Further experiments are done to validate the results. With 110 mA pump power and Erbium-doped fiber of 12.5 m long, highly stable Erbium-doped fiber source with an output power of 13.26 mW and wavelength stability of 0.6 ℃-1 is obtained. Based on a simulation model used to optimize the output spectrum, the output spectrum is nearly Gaussian distribution and the bandwidth is 32 nm. The optical source with high output power, high stability of average wavelength and Gaussian distribution of spectrum after optimization is desirable for fiber optical gyroscope.