一种高性能光纤ASE光源的优化与研究

Optimization and study on a high-performance ASE fiber source

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。

Based on the application requirements of light source in fiber Bragg grating （FBG） sensing system a twc-stage double-pass and erbium-doped amplified spontaneous emission （ASE） fiber source is designed. The structure of source, way of output, length of erbium-doped fiber and pump power are opti- mized. The results show that under the optimal condition, the ASE output with central wavelength at 1 564. 5 nm,output power of 35.8 mW and 85 nm bandwidth in C-＋-L band spectrum is achieved. Its flatness from 1 525 nm to 1 605 nm is less than 2 dBm and especially within 1537 nm and 1597 nm,the flatness is less than 0.5 dBm. The output bandwidth, power and spectral flatness have been enhanced simultaneously,which could meet the demands in fiber Bragg grating sensing systems.