Dan Yan, Xingliang Li, Shumin Zhang, Chaoran Wang, Huijie Li
{"title":"Period-doubling bound-state pulses in a Mamyshev oscillator","authors":"Dan Yan, Xingliang Li, Shumin Zhang, Chaoran Wang, Huijie Li","doi":"10.1117/12.2672450","DOIUrl":"https://doi.org/10.1117/12.2672450","url":null,"abstract":"Based on the combination of cascaded spectral broadening induced by self-phase modulation and offset spectral filtering effect, Mamyshev oscillators have been regarded as convenient test beds for exploring complex nonlinear dynamical behaviors, including stable pulses and pulsations. Here, we demonstrate the experimental observation of bound-state pulses and period-doubling pulsations in a self-starting Yb-doped Mamyshev oscillator. The bound-state pulses operate stably in period-1 as an envelope or two envelopes with different intensities, or operate in pulsating process with period doubling. Thanks to the emerging dispersive Fourier transform technique, the transient spectra of the pulsating boundstate pulse are measured. It is shown that bound-state pulsation pulses of adjacent periods have periodic changes in the pulse shape and energy but the same spectral modulation period from one round trip to another. To our knowledge, this work provides the first observation of period-doubling bound-state pulses in a self-starting Mamyshev oscillator.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120958270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Polarization beam splitter based on sub-wavelength binary grating","authors":"Tingting Dong, Chensheng Wang","doi":"10.1117/12.2672580","DOIUrl":"https://doi.org/10.1117/12.2672580","url":null,"abstract":"Because of the special diffraction characteristic of sub-wavelength grating structures, light energy with different polarization states will distribute in different diffraction orders. These gratings can obtain a high polarization extinction ratio with an appropriate set of parameters of grating structures and the incidence angle. The polarization beam splitters with different operating modes (reflective) was designed, and the finite-difference time-domain (FDTD) method was used to simulate the intensity of each diffraction order. The rigorous coupled wave analysis (RCWA) method was applied to analyze the spectral characteristics and the fabrication tolerance. The effects of the errors are clarified. In this paper, a polarization beam splitter based on grating with binary sub-wavelength structures is proposed. The ridges or grooves can be etched directly on the substrate instead of the dielectric layer. The split gratings work with an oblique incidence angle, and the waves with different polarization are distributed in different diffraction orders in the reflection or transmission area.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129650221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chuan Tian, Weihang Zhou, Chensheng Wang, Hui Yu, Lu Ding, Li Zeng, Xiaoyan Yang, Mixin Wang
{"title":"Exciton-polariton parametric scattering in quasi-one-dimensional system","authors":"Chuan Tian, Weihang Zhou, Chensheng Wang, Hui Yu, Lu Ding, Li Zeng, Xiaoyan Yang, Mixin Wang","doi":"10.1117/12.2672755","DOIUrl":"https://doi.org/10.1117/12.2672755","url":null,"abstract":"Exciton-polaritons, hybrid particles composed of photons and excitons, have been identified as a potential solution for the control of light at the nanoscale. This is due to their unique combination of the controllability of excitons and the fast propagation velocity of photons, which enables Bose-Einstein condensation to occur at room temperature. Excitonpolaritons have also been shown to be capable of generating entangled states through parametric scattering, an important aspect for quantum communication and detection. However, conventional resonant pump techniques for generating entangled exciton-polaritons have limitations. In this work, it reports a successful demonstration of inter-band parametric scattering of exciton-polaritons in quasi-one-dimensional ZnO system through the use of an improved angle-resolved fluorescence spectroscopy system. This observation holds significant implications for the study and application of exciton-polaritons in the field of quantum communication and quantum technology.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133138971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"BP neural network enables 2bits precision improvement for microring weight bank","authors":"Zhenming He, Junwei Cheng, Hailong Zhou, Jianji Dong, Xinliang Zhang","doi":"10.1117/12.2672581","DOIUrl":"https://doi.org/10.1117/12.2672581","url":null,"abstract":"We experimentally demonstrate a method for predicting and compensating the system error of a 3×3 on-chip microring resonator (MRR) weight bank using a pre-designed back propagation (BP) neural network. The system error can be quickly predicted and well compensated to improve the computation precision of optical matrix-vector multiplication (MVM), without bulky experimental devices. The results show that the computation precision can be increased from 5- bit to 7-bit. This work provides a weight accuracy improvement method for MRR-based photonic integrated chips for applications such as optical computing and optical communication.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116805680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Research on the optical properties of an easy-to-prepare beveled fiber","authors":"J. Huang, Ting Liu","doi":"10.1117/12.2672651","DOIUrl":"https://doi.org/10.1117/12.2672651","url":null,"abstract":"Optical fiber has become a very important optical transmission medium due to its excellent anti-interference ability, longdistance transmission and low loss characteristics, which is widely used in signal transmission, remote sensing, optical imaging fields. In order to obtain the specific image spot shape and size, the research of optical output and imaging performance of fiber is gradually increasing. At present, common optical fibers have weak imaging regulation ability, most of the optical fiber imaging probes mainly use light regulation ability of photonic crystal fiber or add microlens on the fiber end face to realize the regulation of light output and imaging ability, which used to light collimate, light focus and control the wavelength of light. However, photonic crystal fibers have the disadvantages of difficult preparation, high equipment requirements and high cost, the method of adding microlens on the fiber end face will cause the probe to be oversize. Here, we propose a simple-fast and cost-effective preparation method for beveled fiber, which can be prepared by beveling and grinding simply. The beveled angle of fiber is closely related to the incident angle and exit angle of the light, different bevel angles will have a huge impact on the propagation path of light and lead to different degrees of total internal reflection of light on the end face of fiber, which will ultimately affect the shape of image spot. The imaging performance of fiber is simulated and analyzed by Zemax software, results show that the shape of image can be control by changing the beveled angle of fiber end face. The experiments show that the actual effect of beveled fiber is consistent with the simulation results, specific imaging requirements can be met by optimizing beveled angle, which is expected to be combined with optical elements to build a compact optical path.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122354093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Zemax-based optimized design of hydrogel fiber lens","authors":"Xiaona Xie, Ting Liu","doi":"10.1117/12.2672872","DOIUrl":"https://doi.org/10.1117/12.2672872","url":null,"abstract":"In the optical fiber sensor, the signal light output from the silica fiber is transmitted to the detector, which usually needs to be coupled through the lens focusing. However, this often destroys the compactness and flexibility of the optical fiber sensor system structure. Therefore, this article proposes a hydrogel fiber optic lens solution, that is, a method that can directly focus the signal light output from the quartz fiber to the photodetector. Its bottom-up photochemical fixation method determines its flexible sexual characteristics and can meet individual needs. In this article, according to the size of the image distance, that is, the distance from the silica fiber to the detector (image distance), and the size of the spot on the detector (focal point), the radius of curvature of the polyethylene glycol diacrylate (PEGDA)-based hydrogel fiber lens and the distance from its apex to the silica fiber end face (object distance) are optimized. Through simulation, it is found that as the radius of curvature decreases, the diameter of the spot increases, and the increase of the object distance also increases the diameter of the spot, while the size of the central bright spot decreases with the decrease of the radius of curvature and the increase of the object distance. Consistent with the variation trend of the Airy disk in the simulation, it is proved that a smaller radius of curvature and a larger object distance can improve the focusing effect of the hydrogel fiber. The simulation based on ZEMAX verifies the application feasibility of this hydrogel fiber lens, which is expected to realize the integration of optical fiber sensor structure and has the potential to be applied to some fields such as industry, biology and medicine.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123331170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shunfeng Han, Jia Li, Zhongyi Ding, Yan Jiang, Xumin Gao, Yongjin Wang
{"title":"Portable underwater audio communication system based on blue LEDs","authors":"Shunfeng Han, Jia Li, Zhongyi Ding, Yan Jiang, Xumin Gao, Yongjin Wang","doi":"10.1117/12.2672784","DOIUrl":"https://doi.org/10.1117/12.2672784","url":null,"abstract":"With the expansion of human activities underwater, such as environmental monitoring, underwater exploration, and scientific data collection, there is an urgent need for a secure, reliable, and high-speed underwater wireless communication technology. Visible light communication technology, as a necessary path for future 6G high-speed wireless communication, has the advantages of high bandwidth, high confidentiality, lightweight equipment size, as well as meets the concept of carbon neutrality. With the rapid development of LED industry, LED-based visible light communication technology has also been widely used and developed, only that most of the researches are established under short distance and high-speed laboratory conditions. In view of the integration requirements of lighting and communication, as well as the serious attenuation of radio frequency communication in water that causes the limited transmission distance, and the low bandwidth of underwater acoustic communication, this paper demonstrates underwater audio transmission over 10 m distance, exploiting four blue (454 nm) LEDs at the transmitter and a photodiode at the receiver. The system uses STC15W4K60S4 microcontroller as the main control chip. The transmitter conducts low-pass filtering and signal amplification through MAX9813L and AD828, and drives LEDs to realize the conversion and transmission of electro-optic signals. The receiver uses photodiode to convert the received optical signal into an electrical signal, and generates the output signal of the audio playback device through transimpedance amplification and filter circuits. Underwater test results prove that the proposed communication system can achieve high audio transmission quality.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114177156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ming-Sien Wen, J. Zhou, Cong Chen, Wentao Zhang, Zujun Qin
{"title":"Vibration detection by energy/power cross-correlation in φ-OTDR","authors":"Ming-Sien Wen, J. Zhou, Cong Chen, Wentao Zhang, Zujun Qin","doi":"10.1117/12.2672604","DOIUrl":"https://doi.org/10.1117/12.2672604","url":null,"abstract":"Reducing false alarming of vibration and shortening data processing time are one of the key problems of phase sensitive optical time-domain reflectometer (φ-OTDR). Generally speaking, there are two demodulation methods to locate vibrations: phase demodulation and amplitude demodulation. At present, an often-used method is phase-based crosscorrelation, which shows a comparatively reliable detection performance. Compared with phase cross-correlation, energy/power cross-correlation between different positions is simpler and has certain advantages in practical applications. In this paper, we use φ-OTDR to collects periodic vibration signals (power signals) and transient vibration signals (energy signals). Amplitude differentiation is firstly calculated along slow time axis for the Rayleigh backscattering trajectories. For periodic vibration, power spectrum is then obtained at each position, and cross-correlation coefficients between any two spectrums are computed. If the vibration is transient, average energy is calculated along fast time axis and average energy cross-correlation is performed between any two locations. With the cross-correlation values, we are able to determine whether there is vibration on the optical fiber. In the experiment, periodic vibration is simulated by a sine-driven PZT and transient vibration is mimicked by pencil-break. These results demonstrate that power (energy) cross-correlation coefficients work well to locate periodic (transient) vibrations.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124772562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fiber-optic particle sizer based on multi-spectral scattering","authors":"Xu Wang, H. Du, Yi Li","doi":"10.1117/12.2672691","DOIUrl":"https://doi.org/10.1117/12.2672691","url":null,"abstract":"In-situ and real-time particle size measurements are necessary in many industrial fields, such as real-time monitoring of particle manufacturing process and intermediate process analysis of chemical reactions. Currently, most of the traditional laser particle size analyzers are bulky, not suitable for in-situ measurement in narrow space. Fiber-optic particle size analyzers based on white-light scattering usually have a slow detection rate and cannot meet the needs of real-time measurement. In this report, a fiber-optic particle sizer based on multi-spectral scattering for in-situ rapid measurement of particle size distribution is proposed. The particle size distribution is measured by a variety of light sources with different spectra based on the Mie scattering theory. We theoretically analyzed the feasibility of this technology and demonstrated in polystyrene microsphere suspensions. The results show that the fiber-optic particle sizer can achieve a measurement accuracy of 0.5μm in the measurement range of 3-15μm, with the measurement speed of 1kHz.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129814117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Structural colors designed by deep learning","authors":"Lu Wang, Tao Wang","doi":"10.1117/12.2671706","DOIUrl":"https://doi.org/10.1117/12.2671706","url":null,"abstract":"Structural colors can be generated by metasurfaces with the capability of spectrum manipulation at subwavelength. In general, the optimization of specific color designs and iterative geometric parameters is computationally time-consuming, so obtaining thousands of different structural colors can be challenging. Deep learning methods offer a new approach to the efficient design of nanophotonic devices, as it revolutionizes the way nanophotonic devices are designed. Here, we trained a deep learning method, which can predict the colors by random geometries in the forward modeling process. The forward design model is good at processing data, which is an effective way to design nanophotonic devices.","PeriodicalId":422113,"journal":{"name":"Photonics and Optoelectronics Meetings","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128355023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
