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High-Speed Multimode Fiber Imaging Using Binary-Modulated Silicon Photonics Optical Phased Array
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DOI：10.1002/lpor.202402206.png)
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Abstract
En 中文
Multimode fiber (MMF) imaging is a powerful technique for minimally invasive endoscopy. However, the absence of high-speed spatial light modulators (SLMs) poses a challenge in the pursuit of high-speed, real-time MMF imaging. Silicon optical phased array (OPA) serves as a possible solution to high-speed mode field manipulation; however, the nonlinearity in the phase response of silicon p-i-n diodes makes it unfeasible to realize precise multilevel control at a high speed. In this paper, it is shown that the driving scheme of p-i-n diodes in a silicon OPA can be simplified by using binary modulation, enabling the use of high-speed digital voltage drivers instead of high-precision digital-to-analog converters. The OPA achieves modulation at 1 MHz, which is three times faster than state-of-the-art SLMs. Experimental results demonstrate a frame rate of up to 500 frames per second. The image-reconstruction period is as short as 0.1 ms per frame, making the system suitable for real-time imaging. The measured spatial resolution is 2.3 mu m with a field of view diameter of 105 mu m, which approaches the diffraction limit.
Keywords:
multimode fiber imaging
optical phased array
p-i-n phase modulators
silicon photonics
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