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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。
The 1.7 μm band light source can reduce tissue scattering and absorption loss in an optical coherence tomography (OCT) system, thereby increasing imaging depth. It is proposed to generate a continuous light source by amplifying a spontaneous emission (ASE) light source to pump a highly nonlinear fiber with a length of 300 m and a dispersion-shifted fiber with a length of 10 km. The tunable filter placed on the ASE pumping source adjusts the peak wavelength and the power of the continuous light source, and the obtained light source absorbs and shapes the erbium-doped fiber to obtain a continuous light source with a peak wavelength of 1675 nm and a 10-dB spectral width of about 75 nm. In order to improve the signal-to-noise ratio (OCT) of the OCT without increasing the pumping power, the Sanjak filter was added and an approximate multi-wavelength broadband light source with a period of 14 nm was obtained. The experimental results show that the proposed structure can realize the wideband light source with a wavelength of 1.7μm. The experimental results provide references for the new OCT source and the 1.7μm fiber laser.