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根据光纤Bragg光栅(FBG)传感系统光源应用需求,研制了一种双级双程结构的掺Er光纤(EDF)ASE(amplified spontaneous emission)光源,并对光源结构、输出方式、EDF长度以及泵浦功率进行了优化研究。结果表明,在最佳条件下实现了输出中心波长为1 564.5nm、功率高达35.8mW和带宽约为85nm的C+L波段ASE输出;光谱平坦度在1537～1597nm范围内小于0.5dBm,在1525～1605nm范围内小于2dBm;同时提高光源的输出带宽、功率和光谱平坦度3个性能指标,可以解决多FBG复用传感系统对光源带宽、功率以及平坦度性能指标的要求。
According to the application requirements of light source of FBG sensing system, a two-stage two-pass EDF (ASE) amplified spontaneous emission (ASE) light source was developed. The structure of the light source, output mode, EDF length and pump Pu power optimization research. The results show that the C + L band ASE output with the output center wavelength of 1 564.5nm, the power of 35.8mW and the bandwidth of 85nm is achieved under the optimum conditions. The spectral flatness is less than 0.5dBm in the range of 1537 ~ 1597nm, ~ 1605nm range is less than 2dBm; while improving the output bandwidth of the light source, power and spectral flatness of the three performance indicators, you can solve the multi-FBG multiplexing sensor system on the light source bandwidth, power and flatness performance requirements.