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Influence of Local Reflection on Photon Counting OTDR and Its Mitigation
Peng Wu;Yun-Ru Fan;Kai Guo;Ji Zhang;Ri-Yao Song;Rui-Ming Zhang;You Wang;Hai-Zhi Song;Guang-Wei Deng;Zong-Liang Xie;Bin Li;Guang-Can Guo;Qiang Zhou
Journal of Lightwave Technology
Year: 2025 | Early Access Article |
Photon counting optical time-domain reflectometry (PC-OTDR), leveraging single photon detection, offers superior spatial resolution and high dynamic range in the testing of optical fiber links. However, the dead time and afterpulsing of the single photon detector could cause distortions on the PC-OTDR trace, especially for the fiber links with strong local reflections, such as the Fresnel reflecti...Show More
Adaptive Joint Correction of the Piston and Large Tip/Tilt of Beam Combination Using Dynamic Metric Stochastic Parallel Gradient Descent Algorithm
Wenbo Fan;Weilong Wei;Ming Li;Kaiyuan Yang;Bo Qi;Zongliang Xie
Journal of Lightwave Technology
Year: 2025 | Early Access Article |
Phase control is paramount for laser beam combination, requiring sequential tip/tilt and piston error correction. The common stochastic parallel gradient descent (SPGD) phase control algorithm using power metrics can't realize the automatic transition from an initial state of spot separation to phase locking. This paper proposes an adaptive metric SPGD phase control method capable of correcting bo...Show More
HDSR: Image Super-Resolution Method for Harmonic Diffraction Optical Imaging System Based on Plug and Play Technology
Shuo Zhong;Xijun Zhao;Dun Liu;Haibing Su;Zongliang Xie;Bin Fan
Harmonic diffractive optical elements (HDOEs) are characterized by their lightweight and compact size, making them promising candidates for applying in future large-aperture space optical imaging systems. However, its lower focusing efficiency and unavoidable manufacturing errors can result in degraded and blurred imaging. To effectively improve the imaging quality of HDOE optical systems, this st...Show More
High-Resolution, Lightweight Remote Sensing via Harmonic Diffractive Optical Imaging Systems and Deep Denoiser Prior Image Restoration
Shuo Zhong;Xijun Zhao;Dun Liu;Haibing Su;Zongliang Xie;Bin Fan
The weight of traditional space optical imaging systems often increases nearly cubically with the increase in aperture size. To overcome this limitation, this study proposes the use of a lightweight harmonic diffractive optical imaging system combined with deep denoiser prior image restoration, to achieve high-resolution, lightweight remote sensing. This research first designed a novel 150-order h...Show More
Piston Sensing for Sparse Aperture Systems via All-Optical Diffractive Neural Network
It is a crucial issue to realize real-time piston correction in the area of sparse aperture imaging. This paper demonstrates that an optical diffractive neural network is capable of achieving light-speed piston sensing. By using detectable intensity distributions to represent pistons, the proposed method can convert the imaging optical field into estimated pistons without imaging acquisition and e...Show More
Deep Learning Piston Sensing for Sparse Aperture Systems With Simulated Training Data
Xiafei Ma;Zongliang Xie;Haotong Ma;Yangjie Xu;Dong He;Ge Ren
The image-based piston sensing method using the convolutional neural network (CNN) is an advanced technique which has good applicability. However, acquiring a large amount of the training dataset required to train a network is difficult to handle in practice. In this letter, we demonstrate the possibility of using a neural network trained by the simulation dataset to accurately sense pistons direc...Show More
Tip/tilt Alignment for a Fizeau Interferometer via Defocus-Based Sub-Spot Separation
Wenyi Lv;Zongliang Xie;Qiang Wang;Haotong Ma;Jianliang Shi;Yang Liu;Kaiyuan Yang;Botao Chen;Yongmei Huang
It is a crucial premise for Fizeau interferometric imaging that all the optical axes of sub-apertures are well aligned. What is challenging in tip/tilt alignment of such interferometers is the superposition of all the sub-aperture spots on the focal plane for generation of fringes. In this paper, we propose and demonstrate a simple tip/tilt alignment scheme via defocus-based sub-spot separation (T...Show More
Non-Line-of-Sight Location With Gauss Filtering Algorithm Based on a Model of Photon Flight
Yu Ren;Zongliang Xie;Yihan Luo;Shaoxiong Xu;Haotong Ma;Yi Tan
Recently, non-line-of-sight (NLOS) detection based on time of flight (TOF) has been investigated. In order to simulate the NLOS location of a hidden object, we derive the signal scattered by the object and build a model of photon flight based on photon scattering and propagation. To improve the authenticity of the model, the bidirectional reflectance distribution function (BRDF) is used to charact...Show More
Incoherent Fourier Ptychography (IFP) is a super-resolution imaging method, which requires lots of iteration time to recover the high-resolution object image from raw images. To improve the convergence rate of the IFP, we propose an improved algorithm, termed momentum-accelerated Incoherent Fourier Ptychography (mIFP). Based on the IFP algorithm, the mIFP adds momentum that is commonly used to acc...Show More
Experimental Study of a Multispectral Piston Sensing Technology
Li Dong;Haotong Ma;Qi Peng;Ge Ren;Bo Qi;Shanchao Liu;Zongliang Xie
Nowadays giant segmented telescopes and multiaperture telescopes have grown out of the quest for high-resolution observations in astronomy. One of the major issues is the phasing of such telescopes. A concept of multispectral piston sensing technology is, therefore, re-examined and studied experimentally for the first time. Based on the phase-shifting “Telescope-Interferometer” technology and mult...Show More
Restoration of Sparse Aperture Images Using Spatial Modulation Diversity Technology Based on a Binocular Telescope Testbed
Zongliang Xie;Haotong Ma;Bo Qi;Ge Ren;Jianliang Shi;Li Dong;Yufeng Tan;Zhipeng Wang;Xiaojun He
In this paper, our recently developed spatial modulation diversity technology (SMDT) is first used to correct the blurring and restore the lost midband contrast of synthetic images based upon an actual sparsely filled aperture system, specifically a binocular telescope testbed consisting of two horizontally arranged collector telescopes with 127 mm diameter. Synthetic images are obtained with the ...Show More
Wavefront Sensing and Image Restoration With Spatially Overlapping Diversity Technology
Zongliang Xie;Haotong Ma;Bo Qi;Ge Ren;Yufeng Tan;Li Dong;Zhipeng Wang;Xiaojun He
IEEE Photonics Technology Letters
Cited by: Papers (3)
We propose and demonstrate a method of spatially overlapping diversity technology for wavefront sensing and image restoration with undersampled systems, which can handle extended objects illuminated by spatially incoherent light. The technique first scans a smaller subaperture across the large pupil of undersampled systems to generate several properly sampled images. Then, a nonlinear optimization...Show More
Restoration of Degraded Images Using Pupil-Size Diversity Technology With Stochastic Parallel Gradient Descent Algorithm
Zongliang Xie;Haotong Ma;Bo Qi;Ge Ren;Yufeng Tan;Bi He;Hengliang Zeng;Chuan Jiang
The performance of imaging systems is inevitably degraded by aberrations of optical systems. Furthermore, images detected by long-distance imaging schemes also suffer blurring induced by atmospheric turbulence. To address this problem, we propose and demonstrate an aberration-free imaging procedure in this paper, which is termed pupil-size diversity technology. With no additional optical element, ...Show More
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