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首页> 外文期刊>Optical and quantum electronics >Spectral filtering in OCT system implemented by mechanically induced long-period fiber grating
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Spectral filtering in OCT system implemented by mechanically induced long-period fiber grating

机译：机械诱导长周期光纤光栅在OCT系统中进行光谱滤波

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摘要

A spectral filtering method that can enhance the axial resolution and suppress sidelobes of the point spread function in Optical Coherence Tomography (OCT) system is demonstrated. A mechanically induced long-period fiber grating (MLPG) is used to tailor the spectral shape of a homemade Er-doped fiber amplified spontaneous emission (ASE) source. By using a MLPG, the high and narrow characteristic peak, centered at 1533 nm, of the ASE source was fairly well removed, which enabled us to use a broader spectral bandwidth of the source. The experimental results show that the proposed spectral filtering method can suppress the sidelobes in the axial point spread function up to 5.4 dB and thus enhance the axial resolution of an OCT system by four times. The OCT images of an extracted human premolar taken with and without the spectral filtering are presented and compared with each other.
机译：提出了一种可以提高轴向分辨率并抑制光学相干断层扫描（OCT）系统中点扩展函数旁瓣的频谱滤波方法。机械感应的长周期光纤光栅（MLPG）用于调整自制掺Er光纤放大的自发发射（ASE）源的光谱形状。通过使用MLPG，可以很好地消除ASE源中心在1533 nm处的高而窄的特征峰，这使我们能够使用更宽的源光谱带宽。实验结果表明，所提出的频谱滤波方法可以将轴向点扩展函数中的旁瓣抑制高达5.4 dB，从而将OCT系统的轴向分辨率提高了四倍。呈现并比较了经过光谱过滤和不经过光谱过滤的人前磨牙的OCT图像。

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