中文摘要：

1.7μm波段光源在光学相干层析成像（OCT）系统中可以减少组织散射和吸收损耗,从而增加成像深度。提出以放大自发辐射（ASE）光源抽运长度为300m的高非线性光纤和长度为10km的色散位移光纤产生连续光源。其中,后置于ASE抽运源的可调谐滤波器调节连续光源的峰值波长和功率,所得光源经过掺铒光纤吸收整形后得到峰值波长为1675nm,10dB谱宽约为75nm的连续光源。为了在不提高抽运功率的情况下提高OCT信噪比,增加了萨尼亚克滤波器,得到了周期为14nm的近似多波长宽带光源。实验结果表明,该结构可实现1.7μm波段的宽带光源,实验分析结果为OCT新型光源及1.7μm波段光纤激光器提供参考。

英文摘要：

Optical sources at 1. 7 μm region of optical coherent tomography （OCT） can reduce scattering and absorption in tissue, and enhance the imaging depth. A 300 m long high nonlinear optical fiber and a 10 km long dispersion shifted fiber are pumped by amplified spontaneous emission （ASE） beam to generate continuous spectrum. The continuous light source at peak wavelength of 1675 nm and 10 dB linewidth of 75 nm can be achieved after erbium-doped fiber absorption, by adjusting the peak wavelength and power of the tunable filter after ASE source. In order to improve OCT signal sensitivity without increasing the optical illumination power, a multi- wavelength broadband light source with 14 nm period is obtained by adding a Sagnac filter. The optical sources at the 1.7 μm region is achieved by the proposed method. Experimental results can provide reference for OCT new light source and 1.7 μm region fiber laser.