Coupling resolution of tapered optical fiber array and CCD

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

doi:10.1117/12.2666859

4 April 2023 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, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126177L (2023) https://doi.org/10.1117/12.2666859
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

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.

Citation Download Citation

Yajie Du, Yonggang Huang, Peng Jiao, Yang Fu, Yun Wang, Jiuwang Wang, and Jinsheng Jia "Coupling resolution of tapered optical fiber array and CCD", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126177L (4 April 2023); https://doi.org/10.1117/12.2666859

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KEYWORDS

Charge-coupled devices

Optical fibers

Image resolution

Tapered optical fibers

Optical arrays

Glasses

Crosstalk

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