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Peng Jiao

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Proceedings Article | 4 April 2023 Paper

Coupling resolution of tapered optical fiber array and CCD

Yajie Du, Yonggang Huang, Peng Jiao, Yang Fu, Yun Wang, Jiuwang Wang, Jinsheng Jia

Proceedings Volume 12617, 126177L (2023) https://doi.org/10.1117/12.2666859

KEYWORDS: Charge-coupled devices, Optical fibers, Image resolution, Tapered optical fibers, Optical arrays, Glasses, Crosstalk, Refractive index, Reflection, Optical resolution

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Coupling resolution is the main parameter for evaluating imaging quality of intensified charge coupled device (ICCD). Tapered optical fiber array (TOFA) is the key coupling medium, which plays the role of zooming in and out the image at a certain magnification. TOFA transfers the optical signal from intensifier to CCD photosensitive surface with high coupling resolution, thus realizing the conversion of two-dimensional spatial image to digital image. In this paper, the resolution of TOFAs and TOFA-CCD couplers is investigated. Theoretical resolution function meets the single exponential decay function. With increase of the optical fiber diameter, the resolution of TOFAs and TOFA-CCD couplers decreases. However, the actual coupling resolution is different from theoretical coupling resolution. The reasons of difference between theoretical resolution and actual resolution are analyzed. Firstly, the taper exists in tapered optical fiber array. Total reflection angle decreases with taper, causing some model lights to leak in the optical fiber. This part of light may be transmitted to adjacent optical fibers, resulting in optical crosstalk. Secondly, the inclination of the end face of tapered optical fiber array cause angle of emitted light to change, which leads to light divergence. Some adjacent CCD photosensitive elements will receive the same optical fiber output light, resulting in decline of image resolution, and then deteriorating image quality. This paper provides data support and the theoretical guiding significance for tapered optical fiber array coupling resolution with CCD.

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