Multimode-fiber/scattering-medium computational optical endoscopic imaging based on digital wavefront modulation

Liyong Ren; Bin Zhuang; Guangzhi Zhao; Chengfang Xu; Yi Geng; Hui Chen; Zhengquan He; Baowen Hu; Yulin Li

doi:10.1117/12.2504224

15 November 2018 Multimode-fiber/scattering-medium computational optical endoscopic imaging based on digital wavefront modulation

Liyong Ren, Bin Zhuang, Guangzhi Zhao, Chengfang Xu, Yi Geng, Hui Chen, Zhengquan He, Baowen Hu, Yulin Li

Author Affiliations +

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109640F (2018) https://doi.org/10.1117/12.2504224
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

Abstract

Light wave becomes extremely distorted when it passes through a turbid medium. Indeed, the inhomogeneity of scattering medium and the mode dispersion of multimode optical fiber (MMF) always distort the propagation of light waves since they divert the propagation direction and disorder the spatial relationship of rays from the object. This becomes a big challenge for the applications of biological tissues endoscopic imaging. To overcome this problem, many methods based on computational optical imaging schemes have been reported and such a research has become a hot topic in recent years. These methods include the computational ghost imaging, the digital phase conjugation, the speckle correlation, the wavefront shaping, and the optical transmission matrix, etc. In this paper, we report our recent works on computational optical imaging based on digital wavefront modulation, which might be useful for the applications of endoscopy. On one hand, we propose a round-trip imaging method based on the optical transmission matrix of scattering medium, where the light wave is distorted twice. The object is recovered directly from the distorted output wave, while no scanning is required during the imaging process; one the other hand, by modulating the amplitude instead of the phase of the incident light wavefront, we propose a high-speed binary amplitude-only modulation method to focus and scan light through an MMF based on the digital micro-mirror device (DMD). This method can also be extended to focus and scan light at multiple planes along the axial direction by just modifying the input wavefront accordingly.

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Liyong Ren, Bin Zhuang, Guangzhi Zhao, Chengfang Xu, Yi Geng, Hui Chen, Zhengquan He, Baowen Hu, and Yulin Li "Multimode-fiber/scattering-medium computational optical endoscopic imaging based on digital wavefront modulation", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109640F (15 November 2018); https://doi.org/10.1117/12.2504224

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KEYWORDS

Digital micromirror devices

Modulation

Scattering

Wavefronts

Amplitude modulation

Endoscopy

Light scattering

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