Real-time photonic measurement of fast non-repetitive events is arguably the most challenging problem in the fields of instrumentation and measurement. The challenge is performing fast continuous single-shot measurements for applications ranging from sensing, spectroscopy, and imaging. Some of the example applications include the study of optical rogue waves, detection of rare cancer cells in blood, industrial inspection and machine vision. Notwithstanding the sensitivity and speed limitations of single-shot real-time measurements, such instruments also create a big data problem. Owing to their high measurement rate, they produce a firehose of data that overwhelms even the most advanced computers. This necessitates innovations in data management and in-inline processing techniques.

The aim of this conference is to create a forum for presentation of the latest developments in real-time photonic instruments, data management and real-time processing, and to create a forum for exchange of ideas in this new and exciting field of photonic instrumentation.

This conference intends to cover the following, and related topics: ;
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Conference 11902

Real-time Photonic Measurements, Data Management, and Processing VI

In person: 10 - 12 October 2021
On demand now
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  • Opening Ceremony and Plenary Session I
  • 1: Imaging and Sensing I
  • Plenary Session II
  • 2: Imaging and Sensing II
  • 3: Biomedical Imaging and Sensing
  • Poster Session
  • 4: Advanced Lasers and Applications
  • 5: Signal Processing
  • 6: Photonic Measurement I
  • 7: Photonic Measurement II
  • 8: Photonic Measurement III
Opening Ceremony and Plenary Session I
In person / Livestream: 10 October 2021 • 09:00 - 12:00 China Standard Time
9:00: Opening Ceremony
9:20: Awards and Recognition

11900-501
Author(s): Rebecca R. Richards-Kortum, Director, Rice 360 Institute for Global Health Technologies (United States), Rice Univ. (United States)
In person / Livestream: 10 October 2021 • 09:30 - 10:10 China Standard Time
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This talk will examine the challenges of designing and translating new low-cost optical technologies to improve global health equity, drawing from examples to improve newborn survival in African hospitals, to improve early detection of cervical cancer for women in Texas and Latin America, and to improve point-of-care diagnosis of COVID-19. The talk will summarize lessons learned to increase the diversity of innovation teams, and to increase the impact and sustainability of the resulting innovations.
11890-502
Author(s): Wentao Wang, State Key Lab. of High Field Laser Physics (China), CAS Ctr. for Excellence in Ultra-intense Laser Science (China), Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
In person: 10 October 2021 • 10:40 - 11:20 China Standard Time
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X-ray free-electron lasers can generate intense and coherent radiation at wavelengths down to the sub-ångström region and have become indispensable tools for applications in structural biology and chemistry, among other disciplines. Several X-ray free-electron laser facilities are in operation; however, their requirement for large, high-cost, state-of-the-art radio-frequency accelerators has led to great interest in the development of compact and economical accelerators. Laser-wakefield accelerators can sustain accelerating gradients more than three orders of magnitude higher than those of radio-frequency accelerators, and are regarded as an attractive option for driving compact X-ray free-electron lasers. However, the realization of such devices remains a challenge owing to the relatively poor quality of electron beams that are based on a laser-wakefield accelerator. After ten years of efforts, we present an experimental demonstration of undulator radiation amplification in the exponential-gain regime by using electron beams based on a laser-wakefield accelerator.
11893-503
Author(s): Rui Zhu, Peking Univ. (China)
In person: 10 October 2021 • 11:20 - 12:00 China Standard Time
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Perovskite solar cells have attracted tremendous attention in recent years due to the high device performance and the superior optoelectronic properties of perovskite materials. In this talk, I will give an introduction about the advances of perovskite solar cells. Then, I will present our efforts on improving the device performance and understanding the device physics of perovskite solar cells. In addition, I will also discuss the advantages of perovskite solar cells for space aircraft application. We have some preliminary efforts of sending the perovskite solar cells into near space. I will share our view about the exciting possibilities for perovskite solar cell technology.
Session 1: Imaging and Sensing I
In person: 10 October 2021 • 13:30 - 15:10 China Standard Time
Session Chair: Tuan Guo, Jinan Univ. (China)
11902-1
Author(s): Chi Zhang, Xinliang Zhang, Huazhong Univ. of Science and Technology (China)
On demand | Presented Live 10 October 2021
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Spectroscopy is an essential tool to explore the interaction between light and matter. With the extensive study of ultrafast phenomena, ultrafast spectrum analysis is in great demand. In view of the limited acquisition frame rate of the conventional spectroscopy, the ultrafast temporal focusing mechanism was proposed and demonstrated, and it is capable of capturing arbitrary waveform signal, with the acquisition frame rate up to 100 MHz. Moreover, several approaches have been proposed to further improve its accuracy and bandwidth, it has achieved 2-pm spectral resolution and 58-nm observation bandwidth, and the observation range has been further extended to microwave and terahertz span. Furthermore, this spectroscopy has successfully characterized ultrafast phenomena and mechanisms of devices, and has been applied to several ultrafast spectral imaging systems.
11902-7
Author(s): Benzhang Wang, Yupeng Zhang, Fan Zhou, Xianlei Ye, Dongliang Quan, China Aerospace Science & Industry Corp., Ltd. (China)
On demand | Presented Live 10 October 2021
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In practical engineering applications, the real-time monitoring of structural physical field is very important, which requires overall performance improvements on the Brillouin optical fiber sensing, including fast measurement, quick data demodulation and small amount of data storage. A novel Brillouin optical time-domain analysis (BOTDA) scheme has been proposed based on compressed sensing and pattern recognition algorithms, which paves the way for the real-time Brillouin optical fiber sensing. In order to test the sensing performance, the Brillouin gain spectrum is measured by the traditional fast BOTDA, where the frequency step and span are 4 MHz and 500 MHz, respectively. By employing the proposed algorithms, the strain information is directly obtained with only 35% of the full data, verifying the feasibility of real-time measurements.
11902-3
Author(s): Henan Wang, Zongda Zhu, Dengwang Zhou, Dexin Ba, Yongkang Dong, Harbin Institute of Technology (China)
On demand
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Brillouin-based optical fiber sensors have been developed over the past few years and played a significant role for distributed temperature and strain measurements. Among these sensors, Brillouin optical fiber sensors via optical chirp chain (OCC) become an ideal choice for ultrafast distributed measurement to distinguish quick-changing events in practical applications. This paper begins with the introduction of the concept of OCC and the schemes of OCC generation. The efforts towards such OCC based Brillouin optical fiber sensing for ultrafast measurement are reviewed here as well, with the OCC based BOTDA, the OCC based BOTDR and many other optimization efforts. In addition, the spectra distortion in OCC based distributed sensing is inevitable due to the transient SBS effect resulting from the fast frequency sweep of OCC. The consequent future challenges of OCC based distributed sensing are discussed and presented as well.
11902-4
Author(s): Mingjiang Zhang, Taiyuan Univ. of Technology (China)
In person: 10 October 2021 • 14:45 - 15:10 China Standard Time
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Chaotic laser has been widely applied in the fields of secure optical communication, random number generation, chaotic lidar, chaotic optical time domain reflector and distributed optical fiber sensing due to its characteristics of wide-spectrum, noise-like, low-coherence and so on. Photonic integrated chaotic semiconductor laser is small in size, stable and low-cost. This report introduce our researches on integrated chaotic laser. A hybrid integrated short cavity chaotic semiconductor laser is proposed. A monolithically integrated chaotic semiconductor laser chip with mutual injection and random distributed feedback is proposed to obtain a wide-band chaotic laser without time delay signature. A DBR laser integrated with an external cavity with active feedback is designed to achieve a wavelength tunable chaotic laser. The distributed optical fiber sensing scheme based on chaotic laser coherence method is proposed to realize the long distance and high resolution distributed sensing.
Plenary Session II
In person / Livestream: 10 October 2021 • 15:30 - 16:20 China Standard Time
15:30: Welcome and Introduction

Q&A period will follow after the talk
11905-504
Author(s): Peter L. Knight, Blackett Lab., Imperial College London (United Kingdom), UK National Quantum Technology Strategic Advisory Board for UKRI (United Kingdom)
In person / Livestream: 10 October 2021 • 15:35 - 16:05 China Standard Time
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The UK through a mix of government and industry funding has committed more than £1Bn over 10 years to a coordinated programme in quantum technology. Seven years into this programme I will describe here how we got there, and our goals for the future. The UK National Quantum Technology Programme has induced a step change in the UK’s capabilities for pushing forward a new sector in future information technologies. I describe how the programme arose and the activities it supported and influenced to deliver these new capabilities, building on a first phase almost £480M investment across several UK government agencies. The UK programme is now in its second phase, with a further substantial investment by UK government and global industries in the UK making a total of over £1Bn. I will describe our plans for ensuring the advanced quantum science and demonstrator platforms in imaging, sensing, communications and computing developed over the past seven years will drive the formation of the QT sector and embed quantum tech in a broad range of industries. References 1. “Blackett Review: The Quantum Age: technological opportunities.” Government Office for Science, Available: https://www.gov.uk/government/publications/quantum-technologies-blackett-review; https://uknqt.ukri.org/files/strategicintent2020/; Peter Knight and Ian Walmsley 2019 Quantum Sci. Technol. 4 040502
Session 2: Imaging and Sensing II
In person: 10 October 2021 • 16:30 - 17:45 China Standard Time
Session Chair: Mingjiang Zhang, Taiyuan Univ. of Technology (China)
11902-5
Author(s): Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Guanghua Liang, Yixuan Wang, Tiegen Liu, Tianjin Univ. (China)
On demand | Presented Live 10 October 2021
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Distributed acoustic sensing (DAS)technology has unique advantage in diverse applications, such as seismology, mineral exploration, and so on. We explored the methods to increase measurement range, distance and speed, which are the most important requirement for field deployment. Heterogeneous sideband linear frequency modulated optical pulse with different frequency modulated bandwidth was used to realize simultaneous measurement of acoustic events in different dynamic ranges. Weak fiber Bragg gratings and phase of constructed single frequency were proposed for long distance sensing. Fast processing algorithm based on a graphics processing unit (GPU) for a linear frequency modulation pulse demodulation was realized. The experiment results verified our methods well.
11902-6
Author(s): Xinwei Wang, Liang Sun, Pingshun Lei, Jianan Chen, Jun He, Yan Zhou, Institute of Semiconductors (China)
On demand | Presented Live 10 October 2021
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High-resolution 3D optical imaging is important for unmanned underwater vehicles (UUVs) in the applications of target detection and recognition, underwater engineering, automatic navigation, scientific research, and natural re-sources exploration. Compared with stereo camera and 3D laser scanning imaging, 3D range-gated imaging (3D RGI) has longer detection range and high-er spatial resolution at the same time. This paper presents a survey on 3D range-gated imaging methods for underwater detection. Up to now, there are two main methods developed, including time slicing method and gated range-intensity correlation method. The literature about 3D RGI has been reviewed in different detection applications for UUV. We also introduce our works in 3D gated range-intensity correlation imaging for fishing net detection and marine life in-situ detection. This paper is beneficial for the 3D RGI technique in underwater detection applications for UUV.
11902-8
Author(s): Tuan Guo, Jinan Univ. (China)
In person: 10 October 2021 • 17:20 - 17:45 China Standard Time
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Surface Plasmon resonance (SPR) optical fiber sensors can be used as a cost-effective and relatively simple-to-implement alternative to well established bulky prism configurations for high sensitivity biomedical and renewable energy measurements. The miniaturized size and remote operation ability offer them a multitude of opportunities for single-point sensing in hard-to-reach spaces. Biomedical detection includes living cells and protein for early diagnosis of disease, together with renewable energy detection for commercialized Li-ion batteries and hydrogen storage will be discussed in detail. All above detections were real time and in-situ performed with high sensitivity.
Session 3: Biomedical Imaging and Sensing
In person: 11 October 2021 • 09:00 - 11:50 China Standard Time
Session Chair: Bo Li, Fudan Univ. (China)
11902-9
Author(s): Lingjie Kong, Tsinghua Univ. (China)
In person: 11 October 2021 • 09:00 - 09:25 China Standard Time
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Functional imaging of neural network dynamics in vivo is essential to decipher the orchestrating mechanisms of both sensation and cognition. However, limited by the inherent tissue scattering, the inertia of imaging hardware, and the tradeoff between field-of-view and resolution, current optical imaging methods face bottlenecks in imaging depth, speed, and scale, etc. In this talk, I will share our recent progress in pushing limits in functional imaging of neural circuits in vivo.
11902-10
Author(s): Biqin Dong, Fudan Univ. (China)
In person: 11 October 2021 • 09:25 - 09:50 China Standard Time
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In this talk, I will discuss the recent development of nanophotonic resonators to overcome the main technical barriers in broadband ultrasound detection and high-resolution photoacoustic microscopy. By detecting and amplifying ultrasonic waves with its integrated light-sound interaction and underlying optical resonance, nanophotonic ultrasonic sensors offer extremely high sensitivity, ultra-broad bandwidth, and wider angular sensitivity, which set the foundation for realizing high speed three-dimensional isotropic resolution photoacoustic microscopy. These unique properties further allow nanophotonic ultrasonic sensors to be integrated with various imaging modalities for diverse biomedical applications, including multi-contrast microscopy, all-optical photoacoustic endoscopy, and long-term cortical vascular imaging in live mice.
11902-11
Author(s): Yujie Xiao, Fudan University (China); Bo Li, Fudan Univ. (China)
On demand | Presented Live 11 October 2021
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The performance of multiphoton brain imaging is ultimately limited by the average power that can be delivered to the specimen, which in turn is limited by heating. We demonstrated an adaptive excitation source that is realized by pulse intensity modulation. By only illuminating the region of interest, the adaptive excitation source leads to a 30-fold reduction in the power requirement for two- or three-photon imaging of brain activity in awake mice for improved high-speed longitudinal neuroimaging.
11902-12
Author(s): Yuanhua Feng, Xiumei Jiang, Jianwen Huang, Shujun Li, Jinan Univ. (China)
In person: 11 October 2021 • 10:45 - 11:10 China Standard Time
11902-13
Author(s): Yuye Ling, Yikai Su, Shanghai Jiao Tong Univ. (China)
In person: 11 October 2021 • 11:10 - 11:35 China Standard Time
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Swept-source optical coherence tomography (SS-OCT) is a high-speed volumetric imaging modality that is suitable for various biomedical research and clinical settings. One of the challenges in this field is to accommodate the huge data generated by the system (up to tens of Gigabytes) on top of existing slow data acquisition and transfer infrastructures. Specifically, for phase-sensitive measurements, an additional calibration channel is often inserted and the data bandwidth is doubled. This issue is of particular nuisance for time-lapse imaging, where real-time measurements need to be streamed. Here we will present our work that leverages compressed sensing technique to reduce the data bandwidth.
11902-14
Author(s): Ye Chen, Dan-ran Li, Fei Xu, Nanjing Univ. (China)
In person: 11 October 2021 • 11:35 - 11:50 China Standard Time
Poster Session
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Conference attendees are invited to attend the poster session on Monday afternoon. Come view the posters, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster Setup: Monday 10:00 to 13:00
View poster presentation guidelines and set-up instructions at
https://spie.org/PA/poster-presentation-instructions
11902-25
Author(s): Xue Wu, Harbin Institute of Technology (China); Weiwei Feng, Yantai Institute of Coastal Zone Research (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Microplastics is defined as a global pollutant, which is concerned by more and more people. A kind of infrared recognition model of microplastics is established by using infrared spectrum combined with neural network algorithm. Twenty kinds of microplastic samples have been tested by using infrared spectrum and each standard microplastic sample has 512 spectral data points. The principal component analysis is used to reduce the dimension of the data and the neural network is trained by the reduced-dimensional data. The results show that the neural network algorithm combined with infrared spectrometer can effectively identify microplastics. It can provide technical support for microplastics identification in the future.
11902-40
Author(s): Yuhan Yao, Yuhe Zhao, Jianji Dong, Huazhong Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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Photonic integrated circuits (PICs) play an important role in transporting and processing analog information. Reconfigurable optical computing chip can meet the needs of implementing miniaturized and multi-functional signal processors which has become a research hotspot in recent years. Here, we designed and fabricated a reconfigurable photonic integrated computing chip based on a quadrilateral MZI topology network. Several analog signal processing functions including temporal differentiation, integration and Hilbert transformation are experimental demonstrated with a processing bandwidth of 40 GHz. By reconfiguring optical path and changing the spectral ratio of the MZI structure in the network, the functions can be switched and the operation order can be tuned. The quadrilateral network is universal and can be extended to a larger network structure in the future.
11902-41
Author(s): Huibo Hong, National Time Service Ctr. (China), Univ. of Chinese Academy of Sciences (China); Ruiai Quan, National Time Service Center, Chinese Academy of Sciences (China), University of Chinese Academy of Sciences (China); Xiao Xiang, Yuting Liu, Junjie Xing, Peng Liu, Mingtao Cao, Tao Liu, Ruifang Dong, Shougang Zhang, National Time Service Center (China), University of Chinese Academy of Sciences (China)
On demand | Presented Live 11 October 2021
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In this paper, a two-way quantum time transfer over 50 km fiber links with the same frequency standard was implemented, with a short-term stability of 2.63 ps at an averaging time of 18 s and a long-term stability of 79.2 fs at 73700 s. The system accuracy in terms of the 50km fiber transfer length is measured as 524.75 ps, the agreement of which with the theoretical simulation illustrates that improving the spectral similarity of the two entangled sources will significantly improve the accuracy. This result shows that the fiber-optic two-way quantum time transfer can be successfully extended to a Metropolitan fiber link distance of around 50 km or longer, not only maintaining the transfer stability well below picosecond but also promising further improvements in synchronization accuracy.
11902-42
Author(s): Chenji Guo, Xunhua Huang, Yuanyuan Hao, Nanjing Normal Univ. (China); Huali Lu, Nanjing Normal University (China); Hua Zhao, Nanjing Normal Univ. (China)
On demand | Presented Live 11 October 2021
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In this study, a modified OAM Mach-Zehnder (M-Z) interferometer for displacement measurement has been proposed and experimentally proved, where two conjugate OAM beams propagate on two arms respectively. The traditional M-Z OAM interferometer was modified by introducing a reflection module in the reference arm. As a result, the optical path shift mismatched reflections on two arms is eliminated, which improves the quality of the petal-like pattern produced by the interference between two conjugate OAM beams. And a significant rotation angle of the petal-like pattern vs. the tiny displacement of the tested object can be clearly observed. By accurately measuring the rotation angle of the petal-like pattern, a tiny displacement ranging from 50 to 800 nm with resolution of ~50 pm has been measured successfully.
11902-43
Author(s): Xiangrui Tian, Lingjie Zhang, Huan Tian, Zhiyao Zhang, Heping Li, Yong Liu, Univ. of Electronic Science and Technology of China (China)
On demand | Presented Live 11 October 2021
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We proposed and experimentally demonstrated a Fourier domain mode locking (FDML) OEO to generate LFM-Costas waveform in this paper. The kernel of the proposed scheme is a tunable frequency-sweeping microwave photonic filter based on stimulated Brillouin scattering effect and phase-modulation-to-intensity-modulation conversion. In the experiment, the generated LFM-Costas waveform with a frequency range from 8.020 GHz to 8.820 GHz has the same Costas sequence, chirp rate and period as the input signal. The FWHM of the compressed pulse after autocorrelation calculations is about 1.80 ns, and the compression ratio is about 11327. After cross-correlation calculations with different-period output waveforms, the FWHM is about 0.008μs and the compression ratio is about 2548.75. Correspondingly, the compression ratio of the input signal is about 147.75. It verifies that the SBS-based FDML-OEO optimizes the phase coherence of the LFM-Costas waveform from a voltage-controlled oscillator.
11902-44
Author(s): Liang Zhang, Haoran Xie, Zhelan Xiao, Zenghuan Qiu, Jilin Zhang, Yikun Jiang, Fufei Pang, Shanghai Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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We demonstrate fast light propagation along kilometer-long optical fibers by the utilization of the Brillouin random lasing oscillation. By recirculation sufficient random feedback of distributed Rayleigh scattering along long-span optical fibers, the generated frequency-downshift Stokes light turns out to be resonating as random lasing oscillation along kilometer-long optical fibers, delivering an efficient anomalous dispersion for the Brillouin pump signals. Consequently, the group velocity of the Brillouin pump signals can essentially be optically manipulated by simply increasing its pump power, indicating a promising all-optical approach to generate fast light effect for all-optical signal processing and sensing applications.
11902-45
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China); Zhaoyang WANG, Science and Technology on Electro-optic Control Laboratory, China (China)
On demand | Presented Live 11 October 2021
11902-46
Author(s): Yuanli Yue, Univ. of Kent (United Kingdom); Shuo Li, Tianjin Univ. of Technology (China); Yue Feng, Univ. of Kent (United Kingdom), Harbin University of Science and Technology (China); Ailing Zhang, Tianjin Univ. of Technology (China); Chao Wang, Univ. of Kent (United Kingdom)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Real-time identification of frequency-hopping millimeter-wave (mm-wave) signals is a real challenge, due to the high demand for detection bandwidth and processing speed. In this paper, we propose and demonstrate a novel microwave photonic approach to identifying frequency hopping of mm-wave signals based on the concepts of photonic time stretch (PTS) and Reservoir Computing (RC). The PTS scheme allows the modulated signal to be slowed down hence reducing the required detection bandwidth. The developed RC model offers unique features such as being more efficient and time-saving in temporal data pattern classification than traditional methods.
11902-47
Author(s): Jianheng Qiu, Liang Zhang, Heming Wei, Yana Shang, Jianxiang Wen, Shanghai Univ. (China); Fufei Pang, Shanghai Univ (China)
On demand | Presented Live 11 October 2021
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Vortex beams have attracted attention due to their unique properties and wide application. A novel scheme of generating the first-order OAM modes based on anti-resonant reflecting guidance mechanism in RCF is proposed and experimentally demonstrated. Anti-resonant reflecting guidance mechanism in RCF can be simply introduced by directly fusion splicing with the standard single-mode fiber (SMF). Correspondingly, the excited modes can transmit inside the central core of the RCF with low refractive index, which has a Gaussian spot distribution (defined as the anti-resonant mode, AR mode). Because of different mode coupling coefficients, the AR mode can be coupled to the HE11 and HE21 modes through exerting pressure on the RCF, respectively. By adjusting the polarization state and applying the pressure on the fiber, OAM modes of both the positive (L = +1) and negative (L = − 1) can be separately generated with efficiencies of 61.28% and 61.9%, respectively.
11902-48
Author(s): Zhidi Liu, Nan Zeng, Wei Guo, Hui Ma, Tsinghua Univ. Shenzhen International Graduate School (China)
On demand | Presented Live 11 October 2021
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Nebulization therapy is a common treatment for respiratory diseases. The particle size distribution and physicochemical properties of the atomized droplets of different nebulizers have a great impact on the treatment. This study employs a polarization measurement system to obtain the real time and online multi-angle polarization scattering signals of droplets. During the atomization experiments of various drugs, multidimensional polarization index group for individual droplet can be recorded one by one, which can be used to retrieve their size and composition. For different liquid medicines, we compared the atomization effects from two nebulizers, ultrasonic nebulizer and compressed air nebulizer. Experimental results confirm that this particle polarization characterization method can become an effective tool to assist doctors to choose a suitable nebulizer to achieve the best therapeutic effect.
11902-49
Author(s): Liang Xu, Lei Zhang, Chen Liu, Lun Li, Chi Zhang, Xinliang Zhang, Huazhong Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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Dual-comb spectroscopy has become a powerful tool for spectral analysis because of its ultra-high resolution and fast frame rate. To capture the stable spectrum in the frequency domain, it is essential to lock the repetition frequency and the carrier envelope offset frequency of the mode-lock laser. By introducing a phase-lock loop to a piezoelectric ceramic based cavity, the repetition frequency can be easily synchronized to an external clock. To lock the carrier envelope offset frequency, a phase-shifted fiber Bragg grating with 132-MHz narrow pass band is introduced, and it is capable of filtering out single comb line of each comb. Therefore, the post-calibration signal for carrier envelope offset frequency can be obtained from the beating signal of the filtered adjacent comb lines. Based on this post-calibration scheme, a stabilized dual-comb spectroscopy is proposed and demonstrated with 120-nm observation bandwidth, 1-pm spectral resolution, and 100-Hz acquisition frame rate.
11902-50
Author(s): Qimin Wang, Zhewen Liu, Nanjing Univ. (China); Xing-bang Zhu, The 41st Research Institute of China Electronics Technology Group Corp. (China); Tao Fang, Xiangfei Chen, Nanjing Univ. (China)
On demand | Presented Live 11 October 2021
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Ultra-fast tunable laser array is very important for the integration and performance improvement of a high-speed optical switching system. In this article, the matrix-grating DFB laser array we used is based on REC technology, which is arranged as a 2-by-8 matrix. Based on this, We have designed an excellent high-speed drive circuit to provide the laser array with a drive current that can control channel switching. The experimental results show that the channel spacing of 16 channels is 100G, and the side mode suppression ratio and power of each channel are above 40dB and 2mW respectively. In addition, the switching time of the two channels is less than 20 nanoseconds, and during the switching process, the centre wavelength drift of each channel meets the WDM requirements under the ITU-T standard.
11902-51
Author(s): Junhao Zhu, Kangning Yu, Gaopeng Xue, Qian Zhou, Xiaohao Wang, Xinghui Li, Tsinghua Univ. Shenzhen International Graduate School (China)
On demand | Presented Live 11 October 2021
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The signal filtering of the grating encoder is significant to the measurement accuracy, aiming at eliminating the background noise potentially from temperature changes, airflow fluctuations, and mechanical vibrations. The empirical mode decomposition (EMD) algorithm owing to its without basis functions and high adaptability, is widely applied for signal decomposition. We extended the EMD algorithm for signal filtering in a grating encoder, showing a small measurement error of 6.2 μm compared with the results of the laser interferometer. In contrast with the traditional filtering method, our proposed EMD algorithm exhibits a stable, accurate, and real-time calculation performance applicable for the grating encoder.
11902-52
Author(s): Ji Dai, Zhen Li, Pan Dai, Tao Fang, Feng Wang, Xiangfei Chen, Nanjing Univ. (China)
On demand | Presented Live 11 October 2021
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A multi-channel simultaneous wavelength-swept DFB laser array based on reconstruction-equivalent-chirp (REC) technique is proposed and manufactured. The REC technology simplifies the fabrication process and greatly reduces the cost of the laser. The laser array contains 4 lasers in parallel with integrated heating resistance for thermal tuning to broaden the wavelength-tuning range.The driving circuits of laser uses FPGA to control the DAC chip to obtain precise current output, and realizes continuous linear output of wavelength by changing the injection current size. The packaged laser module can realize continuous wavelength-swept range of 2.4 nm per channel with the SMSR over 40 dB, achieving simultaneous sweep of four channels with good scanning linearity and scanning speed. The work in this article creates the conditions for a low-cost, small-volume multi-channel sensing system in the future.
11902-53
Author(s): Luyao Ma, Xingyu Zhang, Hao Li, Chaolin Lv, Wenying Zhang, Shanghai Institute of Microsystem and Information Technology (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In recent years, cutting-edge applications such as quantum communications and deep space communications have increased the demand for superconducting nanowire single photon detectors (SNSPD) which can work quickly and efficiently. However, superconducting nanowires generally have large dynamic inductances, which makes SNSPD devices unable to quickly recover after a detection event. Therefore, in the free-running mode, it is difficult for SNSPD to acquire high speed and high efficiency at the same time. This article introduces the active quenching mode into the SNSPD, which makes it difficult to extract response signal. We designed two solutions. The major one is self-difference and the other is passive filtering. Finally, we can make SNSPDs working at 100MHz with relatively high efficiency.
11902-54
Author(s): Ruolan Wang, Liao Chen, Xinliang Zhang, Chi Zhang, Huazhong Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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In this paper, we proposed an ultrafast autocorrelator based on broadband RF analysis system and carried out the simulation verification. In the RF analysis system, the RF spectrum is firstly transformed to the continuous wave probe’ optical spectrum via the cross-phase modulation (XPM). Subsequently, the mapping optical spectrum of the probe is filtered out and then mapped to the time domain through large dispersion. Finally, the mapped RF spectrum is detected and sampled by the real-time sampling system and performed inverse Fourier transformed to obtain the autocorrelator with a frame rate of 50 MHz, a resolution of 300 fs and a measurement range of 600 ps.
Session 4: Advanced Lasers and Applications
In person: 11 October 2021 • 14:30 - 16:50 China Standard Time
Session Chair: Muguang Wang, Beijing Jiaotong Univ. (China)
11902-15
Author(s): Qifan Yang, Peking Univ. (China)
In person: 11 October 2021 • 14:30 - 14:55 China Standard Time
11902-16
Author(s): Yikun Jiang, Liang Zhang, Fufei Pang, Zenghuan Qiu, Zhelan Xiao, Haoran Xie, Jilin Zhang, Shanghai Univ. (China)
In person: 11 October 2021 • 14:55 - 15:20 China Standard Time
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A cascaded random laser cavity based on Brillouin gain is proposed and demonstrated for creating high-order Stokes random laser. The Stokes random laser emission as Brillouin pump were launched into a second half-open fiber cavity to activate the 2nd Stokes random laser. Comprehensive analysis of this cascading Brillouin random fiber laser was performed by characteristics comparison between the 1st and the 2nd Stokes, including the relative intensity/phase noise as well as the linewidth suppression.
11902-17
Author(s): Laiyang Dang, Tao Zhu, Chongqing Univ. (China)
On demand | Presented Live 11 October 2021
11902-18
Author(s): Yiyang Luo, Chongqing Univ. (China)
In person: 11 October 2021 • 16:00 - 16:25 China Standard Time
11902-19
Author(s): Kai Li, Qianqian Huang, Junjie Jiang, Zinan Huang, Lilong Dai, Chengbo Mou, Shanghai Univ. (China)
In person: 11 October 2021 • 16:25 - 16:50 China Standard Time
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We report a L-band high repetition rate (HRR) erbium-doped fiber laser based on dissipative four-wave mixing (DFWM) effect, generating the pulse train with a repetition of ~126 GHz. The repetition rate is determined by the free spectral range of the intra-cavity Lyot filter. Under fixed pump power of 865 mW, the output of cavity can be switched between single-soliton HRR pulse train and bound-soliton HRR pulse train with different orientation of polarization controllers (PCs). Increasing pump power further, noise-like pulse with a fundamental repetition rate of 18.14 MHz can be obtained due to the nonlinear polarization rotation (NPR) effect. We believe this L-band HRR erbium-doped fiber laser will contribute to the development of multi-band HRR fiber lasers in the future.
Session 5: Signal Processing
In person: 12 October 2021 • 08:00 - 10:05 China Standard Time
Session Chairs: Cheng Lin Gu, East China Normal Univ. (China), Chengbo Mou, Shanghai Univ. (China)
11902-20
Author(s): Zhiyao Zhang, Zhen Zeng, Lingjie Zhang, Shangjian Zhang, Yong Liu, Univ. of Electronic Science and Technology of China (China)
In person: 12 October 2021 • 08:00 - 08:25 China Standard Time
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Time-domain mode-locking optoelectronic oscillator (OEO) is proposed to generate an ultrashort microwave pulse train with a low close-to-carrier phase noise and free of chirp. Firstly, theoretical mode of the time-domain mode-locking OEO scheme based on electric modulation is established. Through using this model, the oscillating process in the OEO cavity is numerically simulated. Then, a proof-of-concept experiment is carried out to demonstrate the proposed time-domain mode-locking OEO scheme based on electric modulation, where fundamental and harmonic mode locking are achieved. The experimental results agree with the simulation results. In addition, another time-domain mode-locking OEO scheme based on bias modulation is proposed and demonstrated to achieve high-order mode locking and to generate various microwave pulse waveforms. Finally, an approach to suppressing the supermode noise in a harmonic mode-locking OEO is also proposed and demonstrated.
11902-21
Author(s): Yuan Yu, Weijun Jiang, Xiaolong Liu, Yu Yu, Xinliang Zhang, Wuhan National Research Ctr. for Optoelectronics (China)
In person: 12 October 2021 • 08:25 - 08:50 China Standard Time
11902-22
Author(s): Weifeng Zhang, Lang Zhou, Bin Wang, Beijing Institute of Technology (China)
In person: 12 October 2021 • 08:50 - 09:15 China Standard Time
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A microwave photonic phase shifter with a fully tunable phase shifting range and small RF power variation based on a single MRR is propsoed. A Mach–Zehnder interferometer-coupled MRR is employed to realize the phase tuning, and a Sagnac loop is connected at the end to double the phase tuning by sending the lightwave signal to the MRR again. Thus, a full tunable phase shifting range can be realized. By carefully manipulating the coupling between the ring waveguide and the bus waveguide, the RF power variation of the phase shifter can be largely reduced. A simulation is performed, which shows that a continuously tunable phase shifting range up to 463.5° is achieved with a small RF power variation of less than 1 dB. A silicon photonic chip is also designed and sent for fabrication.
11902-23
Author(s): Chengliang Zhu, Lei Wang, Yong Zhao, Northeastern Univ. (China); Hongpu Li, Shizuoka Univ. (Japan)
On demand | Presented Live 12 October 2021
11902-24
Author(s): Di Zheng, Xihua Zou, Chengming Luo, Xiuwen Zhang, Jing Li, Southwest Jiaotong Univ. (China)
On demand | Presented Live 12 October 2021
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Microwave photonic filter (MPF) based interrogation solutions have attracted considerable research interest, through the sensing information conversion from the optical domain to the microwave domain and high-resolution electrical spectrum analyzing processing techniques. In order to overcome the trade-off between measurement accuracy and interrogation speed existing in the traditional direct-detection method, an efficient machine learning algorithm is introduced into the MPF-based interrogation system. Compared with the traditional direct-detection method, the proposed method can achieve better measurement accuracy under the sparsely sampled frequency response, whilst the interrogation speed is greatly improved. In addition, the well-trained model has strong adaptability to the amplitude variation of the microwave photonic filtering response.
Session 6: Photonic Measurement I
In person: 12 October 2021 • 10:30 - 11:50 China Standard Time
Session Chair: Zhiyao Zhang, Univ. of Electronic Science and Technology of China (China)
11902-30
Author(s): Wenxue Li, East China Normal Univ. (China)
In person: 12 October 2021 • 10:30 - 10:55 China Standard Time
11902-26
Author(s): Tuanwei Xu, Fang Li, Institute of Semiconductors (China)
In person: 12 October 2021 • 10:55 - 11:20 China Standard Time
11902-27
Author(s): Mengke Wang, Yutong He, Zhao Liu, Yali Zhang, Zhiyao Zhang, Shangjian Zhang, Yong Liu, Univ. of Electronic Science and Technology of China (China)
On demand | Presented Live 12 October 2021
11902-28
Author(s): Jinsheng Xu, Jian Zhao, Tianhua Xu, Tianjin Univ. (China); Kenneth Wong, The Univ. of Hong Kong (Hong Kong, China)
In person: 12 October 2021 • 11:35 - 11:50 China Standard Time
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In this work, the traditional S2 method is applied to measure the differential mode group delay (DMGD) of the polarization-maintaining few-mode fiber (PM-FMF) in two polarization directions, respectively, at the first stage. Then the S2 system is improved to realize a simultaneous DMGD measurement of all LP modes. Results show good consistency when different measurement schemes have been applied. The modified scheme can greatly improve the measurement efficiency by adding only one polarizer. The improvement of the characterization approach for fiber parameters will contribute to the design and the optimization of the PM-FMF.
Session 7: Photonic Measurement II
In person: 12 October 2021 • 13:20 - 15:00 China Standard Time
Session Chair: Tuanwei Xu, Institute of Semiconductors, Chinese Academy of Sciences (China)
11902-29
Author(s): Jianzhong Zhang, Quan Chai, Jun Yang, Harbin Engineering Univ. (China)
In person: 12 October 2021 • 13:20 - 13:45 China Standard Time
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Fiber Bragg grating (FBG) is a periodic refractive index modulated (RIM) optical component, which is widely used in communication and sensing fields. The properties of an FBG are determined by the RIM distribution, and can be designed according to different requirements. However, RIM distributed characteristics induce discrepancy of the frequency and time domain performance of designed actual FBG between the designed and the actual FBGs, and will even finally affect the performance of the system, especially in high speed communication systems. Therefore, it is essential to measure the radial and axial RIM distribution for characterization, qualification and evaluation of FBGs. An FBG RIM distribution measurement method based on optical low coherence technology is proposed, which can measure the radial and axial RIM distribution of various FBGs, such as uniform FBG, apodization FBG, phase-shift FBG, polarization-maintaining FBG, DFB, etc., and provides a new way of FBG evaluation.
11902-31
Author(s): Muguang Wang, Beilei Wu, Beijing Jiaotong Univ. (China)
On demand | Presented Live 12 October 2021
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High-accuracy and high-speed optoelectronic oscillator (OEO)-based magnetic field and electric current fiber measurement is presented in this paper. Thanks to the Giant-Magnetoresistance Effect and Faraday Effect, the magnetic field and electric current can be transformed to the changes in characteristics of light propagating in optical fiber. Then, the use of OEO can translate the magnetic field and electric current dependent changes in optical domain to the oscillating frequency changes in microwave domain in order to increase the interrogation speed and resolution. The theoretical analysis and principle are investigated systematically. Experimental results are then provided to validate the OEO-enabled magnetic field and electric current measurement techniques.
11902-32
Author(s): Wenjun Zhao, Nanjing Univ. of Aeronautics and Astronautics (China), Hebei Semiconductor Research Institute (China); Xiaoxiao Yao, Nanjing Univ. of Aeronautics and Astronautics (China); Cui Yu, Hebei Semiconductor Research Institute (China); Simin Li, Shilong Pan, Nanjing Univ. of Aeronautics and Astronautics (China)
On demand | Presented Live 12 October 2021
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A photonic transceiver of microwave Doppler frequency shift (DFS) measurement, which possesses the capability of generating a frequency-quadruplicated transmitted signal and evaluating the velocity and the direction of the moving target, is proposed. In the transmitter, the frequency-quadruplicated transmitted signal is generated by beating the optical carrier-suppressed ±2nd sidebands. In the receiver, a low-frequency reference signal is introduced to estimate the sign of the DFS. Compared with other microwave photonic DFS measurement solutions, the proposed approach takes the advantages of generating a high transmitted signal simultaneously, employing a low reference signal, and having no use of optical filter.
11902-33
Author(s): Bin Zhang, Yi Su, Yifeng Chen, Chunjie Sui, Qingdao Univ. of Science and Technology (China)
On demand | Presented Live 12 October 2021
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Simultaneous measurement and visualisation of multi-parameters are crucial in understanding and characterising complex combustion. A measurement technique coupled with deflection tomography and particle image velocimetry was proposed to obtain three-dimensional temperature and velocity fields of swirling combustion. A combustion system was developed to generate a non-premixed swirling flame. Moiré patterns in four view angles and tracer particle images illuminated by volume light source were captured simultaneously using a hybrid measurement system. Three-dimensional temperature and velocity fields were quantitatively reconstructed. The characteristics of swirling combustion were analysed on the bases of visualisations of temperature distribution, velocity distribution and streamlines.
Session 8: Photonic Measurement III
In person: 12 October 2021 • 15:30 - 17:20 China Standard Time
Session Chair: Bin Zhang, Qingdao Univ. of Science and Technology (China)
11902-34
Author(s): Xin Zhao, Beihang Univ. (China)
On demand | Presented Live 12 October 2021
11902-35
Author(s): Cheng Lin Gu, East China Normal Univ. (China)
In person: 12 October 2021 • 15:55 - 16:20 China Standard Time
11902-36
Author(s): Yi Yang, Junhao Zhu, Guochao Wang, Xinqiong Lu, Kai Ni, Xinghui Li, Tsinghua Univ. Shenzhen International Graduate School (China)
In person: 12 October 2021 • 16:20 - 16:35 China Standard Time
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Optical frequency combs (OFC) are widely used in time-frequency technology and precision spectrum measurement. The marvelous features of optical frequency of OFC promote the development of real-time high-precision absolute distance measurement based on multi-wavelength interference. This article proposes a multi-wavelength synchronization signal processing method based on field programmable gate array (FPGA), which uses multi-channel phase measurement modules for real-time signal acquisition of reference and measurement electrical signals corresponding to different wavelengths. In the experiment, the linear accuracy, stability and synchronization performance of the multi-channel phase measurement module were tested. The experimental results show that the resolution of synchronous phase measurement can reach 0.1°, and the corresponding distance measurement accuracy can reach the order of 100 picometers.
11902-37
Author(s): Zhiyao Zhang, Yaowen Zhang, Lingjie Zhang, Univ. of Electronic Science and Technology of China (China); Ying Xu, Yutong He, UESTC (China); Shangjian Zhang, Yujia Zhang, Yong Liu, Univ. of Electronic Science and Technology of China (China)
On demand | Presented Live 12 October 2021
11902-38
Author(s): Ye Xiao, Ming Li, Institute of Semiconductors (China)
In person: 12 October 2021 • 16:50 - 17:05 China Standard Time
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We demonstrate a real-time full-field optical characterization (includes wavelength, amplitude and phase) analyzer based on wavelength-to-time mapping (WTM). By employing WTM technology, the equidistant spectral modes of an optical frequency comb are mapped into the time domain, thus an optical wavelength ruler in time domain can be obtained, and that we can use this ruler to realize a new type of optical spectrum analyzer. Experiments show that proposed method provides a real-time full-field optical characterization measurement technology with measurement speed of ~51 MHz, spectral resolution of ~21 pm,and single channel measurement range of ~10 nm.
11902-39
Author(s): Yuwei Zhao, Jintao Fan, Youjian Song, Minglie Hu, Tianjin Univ. (China)
On demand | Presented Live 12 October 2021
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Soliton molecules, exhibiting similarities to molecular-like behavior, have attracted tremendous attention. With the dramatic recent advances in real time spectroscopic techniques as well as time-domain probes, the detailed nature of various soliton molecular has been revealed. Particularly, time-stretch dispersive Fourier transform (DFT) technique has been applied to unveil the complex internal dynamics of bound states. Nevertheless, the observation time frame of such technique is limited to hundreds of micro seconds mainly confined by the storage capability of the real time oscilloscopes, as well as by the number and the distribution of soliton pulses. Here, we experimentally demonstrate a new probing concept, orbital angular momentum (OAM)-resolved method, for visual extraction of long-term internal phase motions within soliton molecules produced by a mode locked laser.
Conference Chair
Ming Li
Institute of Semiconductors, Chinese Academy of Sciences (China)
Conference Chair
UCLA Samueli School of Engineering (United States)
Conference Chair
Loyola Marymount Univ. (United States), Tachyonics Inc. (United States)
Program Committee
Tsinghua Univ. (China)
Program Committee
Nanjing Univ. (China)
Program Committee
Huazhong Univ. of Science and Technology (China)
Program Committee
National Time Service Ctr., Chinese Academy of Sciences (China)
Program Committee
Harbin Institute of Technology (China)
Program Committee
Shanghai Jiao Tong Univ. (China)
Program Committee
The Univ. of Georgia (United States)
Program Committee
Zhejiang Univ. (China)
Program Committee
Tianjin Univ. (China)
Program Committee
KAIST (Korea, Republic of)
Program Committee
Shizuoka Univ. (Japan)
Program Committee
Xueming Liu
Zhejiang Univ. (China)
Program Committee
Univ. of Electronic Science and Technology of China (China)
Program Committee
Shanghai Univ. (China)
Program Committee
Shanghai Univ. (China)
Program Committee
Southern Univ. of Science and Technology of China (China)
Program Committee
Peking Univ. (China)
Program Committee
Shanghai Jiao Tong Univ. (China)
Program Committee
The Univ. of Hong Kong (Hong Kong, China)
Program Committee
Univ. of Kent (United Kingdom)
Program Committee
Jian Wang
Huazhong Univ. of Science and Technology (China)
Program Committee
Heriot-Watt Univ. (United Kingdom)
Program Committee
Nanjing Univ. (China)
Program Committee
Kun Xu
Beijing Univ. of Posts and Telecommunications (China)
Program Committee
Henan Univ. of Science and Technology (China)
Program Committee
Shanghai Jiao Tong Univ. (China)
Program Committee
Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (China)
Program Committee
Shangjian Zhang
Univ. of Electronic Science and Technology of China (China)
Program Committee
Wuhan National Research Ctr. for Optoelectronics (China)
Program Committee
Nanjing Normal Univ. (China)
Program Committee
Tsinghua Univ. (China)
Program Committee
Zheng Zheng
Beihang Univ. (China)
Program Committee
Chongqing Univ. (China)
Program Committee
Southwest Jiaotong Univ. (China)
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