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Design and Realization of Phased Array Radar Optical Fiber Transmission System 被引量:3
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作者 胡善清 刘峰 龙腾 《Journal of Beijing Institute of Technology》 EI CAS 2007年第1期87-92,共6页
One optical fiber transmission system is designed. The modularization optical fiber transmission adapters were utilized in the system, so the system structure could be flexibly sealable. The sub-array adapter and sign... One optical fiber transmission system is designed. The modularization optical fiber transmission adapters were utilized in the system, so the system structure could be flexibly sealable. The sub-array adapter and signal processor adapter were designed and realized utilizing the new field programmable gate array (FP- GA) which could drive the optical transceiver. The transmission agreement was designed based on the data stream. In order to solve the signal synchronization problem of the optical fiber transmitted phased array radar, a method named synchronous clock was designed. The fiber transmission error code rate of the system was zero with an experimental transmission velocity of 800 Mbit/s. The phased array radar system has detected the airplane target, thus validated the feasibility of the design method. 展开更多
关键词 phased array radar optical fiber transmission ADAPTER SYNCHRONIZATION
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Beam Steering Analysis in Optically Phased Vertical Cavity Surface Emitting Laser Array
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作者 荀孟 孙昀 +5 位作者 徐晨 解意洋 金智 周静涛 刘新宇 吴德馨 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第3期30-34,共5页
Beam steering in implant defined coherently coupled vertical cavity surface emitting laser (VCSEL) arrays is simulated using the FDTD solution software. Angular deflection dependent on relative phase differences amo... Beam steering in implant defined coherently coupled vertical cavity surface emitting laser (VCSEL) arrays is simulated using the FDTD solution software. Angular deflection dependent on relative phase differences among elements, inter-element spacing, element size and emitted wavelength is analyzed detailedly and systematically. We design and fabricate 1×2 implant defined VCSEL arrays for optimum beam steering performance. Electroni- cally controlled beam steering with a maximum deflection angle of 1.6° is successfully achieved in the 1 × 2 VCSEL arrays. The percentage of the power in the central lobe is above 39% when steering. The results show that the steering is controllable. Compared with other beam steering methods, the fabrication process is simple and of low cost. 展开更多
关键词 VCSEL Beam Steering Analysis in optically phased Vertical Cavity Surface Emitting Laser array
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Comparative Study on Beam Broadening in Optically Controlled and Conventional Phased Array
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作者 高瑜翔 何子述 +1 位作者 徐继麟 韩春林 《Journal of Electronic Science and Technology of China》 2005年第1期6-9,共4页
The bandwidth characteristic of phased array antenna can be represented by the extent of beam broadening as signal bandwidth is increased. By using two kinds of bandpass signals, the beam 3dB-width values for a variet... The bandwidth characteristic of phased array antenna can be represented by the extent of beam broadening as signal bandwidth is increased. By using two kinds of bandpass signals, the beam 3dB-width values for a variety of instantaneous bandwidths in conventional phased array and wide band optically phased array are respectively analyzed and simulated based on both of their models. And some corresponding curves are given. 展开更多
关键词 optically phased array beam broadening instantaneous bandwidth
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Independent dual beams generated by array element division in integrated optical phased arrays
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作者 Guihan Wu Yu Xin +7 位作者 Lemeng Leng Xiang Ji Shichong Yang Kaifei Tang Quan Luo Hongsheng Luo Jinshan Su Wei Jiang 《Chinese Optics Letters》 SCIE EI CAS 2024年第7期35-41,共7页
Optical phased arrays(OPAs)have broad application prospects due to their advanced capability in beamforming and steering.In this work,we achieve independent dual beams in the far field by dividing the array elements o... Optical phased arrays(OPAs)have broad application prospects due to their advanced capability in beamforming and steering.In this work,we achieve independent dual beams in the far field by dividing the array elements of the OPA,with the maximum scanning range reaching 100°.Based on the working principle of OPAs,theoretical considerations of such multibeam generation are presented.A phase data allocation approach for OPAs in the presence of fabrication-induced random phase variation is developed.Simulations of large ensembles of OPAs with various levels of random residual phase errors have been conducted to help analyze the results.This approach can help OPAs realize multi-beams for light detection and ranging(LiDAR). 展开更多
关键词 optical phased arrays beamforming phase error calibration array element division
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Effect of One/Two-dimensional Bonding Phases on Strength and Toughness of Carbon-containing Refractories
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作者 ZHU Boquan LI Xiangcheng +2 位作者 CHEN Ping'an WEI Guoping WANG Xuan 《China's Refractories》 CAS 2018年第3期8-20,共13页
Gaseous phases of carbon-containing and metastable oxides will be resulted from the carbonization of phenolic resin binders and the reduced reactions between C and oxides at high temperatures in carbon-containing refr... Gaseous phases of carbon-containing and metastable oxides will be resulted from the carbonization of phenolic resin binders and the reduced reactions between C and oxides at high temperatures in carbon-containing refractories. With the in-situ catalysis technique, these gaseous phases can be transformed to one-or two-dimensional bonding phases by deposition,which is favorable for the improvement on strength and toughness of carboncontaining refractories,especially low carbon refractories. The research results reveal that:( 1) the amorphous carbon resulted from phenolic resin can be transformed to carbon nanotubes,thus,the oxidation peak temperature is raised from 506 to 664. 6 ℃;( 2) onedimensional whiskers of MgO or Mg Al2 O4 can be in-situ formed in MgO-C refractories, and their CMOR,CCS,rupture displacement and residual CCS( two water quenching cycles,1 100 ℃) are increased by 66%,47%,13% and 26%,respectively;( 3) two-dimensional array structure of flake β-SiAlON can be in-situ formed in Al2 O3-C refractories,which improves the material strength by 60% and decreases the residual strength after thermal shock by only 4. 5 MPa. It is believed that the in-situ formation of one-or two-dimensional bonding phases at high temperatures can improvethe comprehensive thermal physical properties of carboncontaining refractories,and will be the developing trend of the strengthening and toughening of low carbon-containing refractories. 展开更多
关键词 carbon-containing refractories bonding phase ONE-DIMENSIONAL two-dimensional array structure
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Polarization-independent two-dimensional beam steering using liquid crystal optical phased arrays 被引量:9
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作者 Liang Wu Xiangru Wang +4 位作者 Caidong Xiong Ziqiang Huang Rusheng Zhuo Jiarui Rao Qinggui Tan 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第10期81-84,共4页
A polarization-independent nonmechanical laser beam steering scheme is proposed to realize continuous two-dimensional(2 D) scanning with high efficiency, where the core components are two polarization-dependent devi... A polarization-independent nonmechanical laser beam steering scheme is proposed to realize continuous two-dimensional(2 D) scanning with high efficiency, where the core components are two polarization-dependent devices, which are called liquid crystal optical phased arrays(LC-OPAs). These two one-dimensional(1D) devices are orthogonally cascaded to work on the state of azimuthal and elevation steering, respectively. Properties of polarization independence as well as 2D beam steering are mathematically and experimentally verified with a good agreement. Based on the experimental setup, linearly polarized beams with different polarization angles are steered with high accuracy. The measured angular deviations are less than 5 μrad, which is on the same order of the accuracy of the measurement system. This polarization-independent 2 D laser beam steering scheme has potential application for nonmechanical laser communication, lidar, and other LC-based systems. 展开更多
关键词 LC Polarization-independent two-dimensional beam steering using liquid crystal optical phased arrays OPA HWP
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Optical true time-delay for two-dimensional phased array antennas using compact fiber grating prism 被引量:1
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作者 魏永峰 袁超伟 +4 位作者 黄善国 高欣璐 周静 韩曦 顾畹仪 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第10期39-42,共4页
A two-dimensional(2D) optical true-time delay(TTD) beam-forming system using a compact fiber grating prism(FGP) for a planar phased array antenna(PAA) is proposed. The optical beam-forming system mainly consists of a ... A two-dimensional(2D) optical true-time delay(TTD) beam-forming system using a compact fiber grating prism(FGP) for a planar phased array antenna(PAA) is proposed. The optical beam-forming system mainly consists of a TTD unit based on the same compact FGP, one tunable laser for elevation beam steering, and a controlled wavelength converter for azimuth beam steering. A planar PAA using such 2D optical TTD unit has advantages such as compactness, low bandwidth requirement for tunable laser sources, and potential for large-scale system implementations. The proof-of-concept experiment results demonstrate the feasibility of the proposed scheme. 展开更多
关键词 time optical true time-delay for two-dimensional phased array antennas using compact fiber grating prism TTD FGP
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High-power mode-programmable orbital angular momentum beam emitter with an internally sensed optical phased array
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作者 龙金虎 邓宇 +7 位作者 高志强 常洪祥 常琦 马阎星 吴坚 粟荣涛 马鹏飞 周朴 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第2期120-127,共8页
The high-power mode-programmable orbital angular momentum(OAM)beam has attracted significant attention in a wide range of applications,such as long-distance optical communication,nonlinear frequency conversion,and bea... The high-power mode-programmable orbital angular momentum(OAM)beam has attracted significant attention in a wide range of applications,such as long-distance optical communication,nonlinear frequency conversion,and beam shaping.Coherent beam combining(CBC)of an optical phased array(OPA)can offer a promising solution for both generating the high-power OAM beam and rapidly switching the OAM modes.However,achieving real-time phase noise locking and formation of desired phase structures in a high-power CBC system faces significant challenges.Here,an internal phase-sensing technique was utilized to generate the high-power OAM beam,which effectively mitigated thermal effects and eliminated the need for large optical devices.An OPA with six elements was employed for experimental demonstration.The first effective generation of over 1.5 kW mode-programmable OAM beam in a continuous-wave domain was presented.Moreover,the results demonstrated that the generated OAM beam could be modulated with multiple dimensions.The topological charge can be switched in real time from-1 to-2.Notably,this OAM beam emitter could function as an OAM beam copier by easily transforming a single OAM beam into an OAM beam array.More importantly,a comprehensive analysis was conducted on power scaling,mode switching speed,and expansion of OAM modes.Additionally,the system’s compact design enabled it to function as a packageable OAM beam emitter.Owing to the advantages of having high power and programmable modes with multiple dimension modulation in phase structures and intensity distribution,this work can pave the way for producing high-power structured light beams and advancing their applications. 展开更多
关键词 orbital angular momentum optical vortex optical phased array coherent beam combining
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Experimental Investigation of Two-Dimensional Velocity on the 90&deg;Double Bend Pipe Flow Using Ultrasound Technique 被引量:3
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作者 San Shwin Ari Hamdani +1 位作者 Hideharu Takahashi Hiroshige Kikura 《World Journal of Mechanics》 2017年第12期340-359,共20页
An experimental investigation was performed to investigate two-dimensional axial velocity field at downstream of the 90&deg;double bend pipe with and without inlet swirling condition. The main objectives are to fi... An experimental investigation was performed to investigate two-dimensional axial velocity field at downstream of the 90&deg;double bend pipe with and without inlet swirling condition. The main objectives are to find separation region and observe the influence of inlet swirling flow on the velocity fluctuation using ultrasound technique. The experiments were carried out in the pipe at Reynolds number Re = 1 × 104. In case of inlet swirling flow condition, a rotary swirler was used as swirling generator, and the swirl number was setup S = 1. The ultrasonic measurements were taken at four downstream locations of the second bend pipe. Phased Array Ultrasonic Velocity Profiler (Phased Array UVP) technique was applied to obtain the two-dimensional velocity of the fluid and the axial and tangential velocity fluctuation. It was found that the secondary reverse flow became smaller at the downstream from the bend when the inlet condition on the first bend was swirling flow. In addition, inlet swirling condition influenced mainly on the tangential velocity fluctuation, and its maximum turbulence intensity was 40%. 展开更多
关键词 phased array Ultrasonic VELOCITY PROFILER Swirling Flow two-dimensional VELOCITY ROTARY SWIRLER
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Hybrid Optical Beam-Former in Receiver Mode
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作者 Pham Q. Thai Arokiaswami Alphones 《Optics and Photonics Journal》 2011年第3期130-136,共7页
In this paper, an optical beam-former in receiving mode has been proposed and experimentally demonstrated. The requirement in system's hardware has been dramatically reduced using a hybrid approach between dispers... In this paper, an optical beam-former in receiving mode has been proposed and experimentally demonstrated. The requirement in system's hardware has been dramatically reduced using a hybrid approach between dispersive and non-dispersive delay. The proposed system is capable of supporting RF signals from L-band to X-band, with large coverage and strong robustness against the grating's group delay ripples. 展开更多
关键词 CHIRPED Fiber GRATING Group Delay RIPPLE Microwave PHOTONICS optical phased array ANTENNAS
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Intelligent Space All-Optical Network Technology
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作者 DONG Tao YIN Jie +2 位作者 LIU Zhihui ZHANG Tingting GUO Hui 《Aerospace China》 2017年第4期19-25,共7页
Microwave transmission in a space network is greatly restricted due to precious radio spectrum resources. To meet the demand for large-bandwidth, global seamless coverage and on-demanding access, the Space All-Optical... Microwave transmission in a space network is greatly restricted due to precious radio spectrum resources. To meet the demand for large-bandwidth, global seamless coverage and on-demanding access, the Space All-Optical Network(SAON) becomes a promising paradigm. In this paper, the related space optical communications and network programs around the world are first briefly introduced. Then the intelligent Space All-Optical Network(i-SAON), which can be deemed as an advanced SAON, is illustrated, with the emphasis on its features of high survivability, sensing and reconfiguration intelligence, and large capacity for all optical load and switching. Moreover, some key technologies for i-SAON are described, including the rapid adjustment and control of the laser beam direction, the deep learning-based multi-path anti-fault routing, the intelligent multi-fault diagnosis and switching selection mechanism, and the artificial intelligence-based spectrum sensing and situational forecasting. 展开更多
关键词 Space All-optical Network intelligence optical phased array routing network prediction
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Energy‑efcient integrated silicon optical phased array 被引量:6
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作者 Huaqing Qiu Yong Liu +3 位作者 Xiansong Meng Xiaowei Guan Yunhong Ding Hao Hu 《Frontiers of Optoelectronics》 EI CSCD 2023年第3期77-100,共24页
An optical phased array(OPA)is a promising non-mechanical technique for beam steering in solid-state light detection and ranging systems.The performance of the OPA largely depends on the phase shifter,which afects pow... An optical phased array(OPA)is a promising non-mechanical technique for beam steering in solid-state light detection and ranging systems.The performance of the OPA largely depends on the phase shifter,which afects power consumption,insertion loss,modulation speed,and footprint.However,for a thermo-optic phase shifter,achieving good performance in all aspects is challenging due to trade-ofs among these aspects.In this work,we propose and demonstrate two types of energy-efcient optical phase shifters that overcome these trade-ofs and achieve a well-balanced performance in all aspects.Additionally,the proposed round-spiral phase shifter is robust in fabrication and fully compatible with deep ultraviolet(DUV)processes,making it an ideal building block for large-scale photonic integrated circuits(PICs).Using the high-performance phase shifter,we propose a periodic OPA with low power consumption,whose maximum electric power consumption within the feld of view is only 0.33 W.Moreover,we designed Gaussian power distribution in both the azimuthal(ψ)and polar(θ)directions and experimentally achieved a large sidelobe suppression ratio of 15.1 and 25 dB,respectively. 展开更多
关键词 optical phased array optical phase shifter Silicon photonics Integrated optics
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10 Gb/s free space optical interconnect with broadcasting capability enabled by a silicon integrated optical phased array 被引量:3
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作者 Quan You Daigao Chen +1 位作者 Xi Xiao Shaohua Yu 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第12期11-15,共5页
We have proposed and experimentally demonstrated a reconfigurable free space optical interconnect with broadcasting capability based on an eight-channel silicon integrated optical phased array.By using the silicon int... We have proposed and experimentally demonstrated a reconfigurable free space optical interconnect with broadcasting capability based on an eight-channel silicon integrated optical phased array.By using the silicon integrated beam steering and broadcasting device,10 Gb/s on-off keying data is transmitted over 15 cm in free space for up to three receivers located in three different cards.The experimental results show that the optical phased array can be used with broadcasting capability provided to multi-receivers in the card to card optical interconnects,which can significantly reduce device size,system complexity,and total costs. 展开更多
关键词 optical phased array optical interconnect card to card transmission
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Photonic microwave true time delays for phased array antennas using a 49 GHz FSR integrated optical micro-comb source[Invited] 被引量:6
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作者 XINGYUAN Xu JIAYANG Wu +6 位作者 THACH G.NGUYEN TANIA MOEIN SAI T.CHU BRENT E.LITTLE ROBERTO MORANDOTTI ARNAN MITCHELL DAVID J.Moss 《Photonics Research》 SCIE EI 2018年第5期I0055-I0061,共7页
We demonstrate significantly improved performance of a microwave true time delay line based on an integrated optical frequency comb source. The broadband micro-comb(over 100 nm wide) features a record low free spectra... We demonstrate significantly improved performance of a microwave true time delay line based on an integrated optical frequency comb source. The broadband micro-comb(over 100 nm wide) features a record low free spectral range(FSR) of 49 GHz, resulting in an unprecedented record high channel number(81 over the C band)—the highest number of channels for an integrated comb source used for microwave signal processing. We theoretically analyze the performance of a phased array antenna and show that this large channel count results in a high angular resolution and wide beam-steering tunable range. This demonstrates the feasibility of our approach as a competitive solution toward implementing integrated photonic true time delays in radar and communications systems. 展开更多
关键词 Photonic microwave true time delays for phased array antennas a 49 GHz FSR integrated optical micro-comb source
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Optical True Time Delay for Phased Array Antennas Composed of 2×2 Optical MEMS Switches and Fiber Delay Lines
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作者 Back-Song Lee Jong-Dug Shin Boo-Gyoun Kim 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期487-488,共2页
We proposed an optical true time delay (TTD) for phased array antennas (PAAs) composed of 2×2 optical MEMS switches, single-mode fiber delay lines, and a fixed wavelength laser diode. A 3-bit TTD for 10 GHz PAAs ... We proposed an optical true time delay (TTD) for phased array antennas (PAAs) composed of 2×2 optical MEMS switches, single-mode fiber delay lines, and a fixed wavelength laser diode. A 3-bit TTD for 10 GHz PAAs was implemented with a time delay error less than ± 0.2 ps. 展开更多
关键词 for TTD in MEMS optical MEMS Switches and Fiber Delay Lines optical True Time Delay for phased array Antennas Composed of 2 of
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Fast and deterministic optical phased array calibration via pointwise optimisation
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作者 Jingwen Shan Hanyi Zhang +2 位作者 Lijing Li Weijie Deng Mingjie Sun 《Light(Advanced Manufacturing)》 2023年第2期39-47,共9页
Owing to the structural errors in the optical phased array,an initial random phase reduces the quality of the deflection beam.The most commonly applied approach to phase calibration is based on adaptive optics.However... Owing to the structural errors in the optical phased array,an initial random phase reduces the quality of the deflection beam.The most commonly applied approach to phase calibration is based on adaptive optics.However,adaptive optimisation approaches have slow convergence and low diffraction efficiency.We proposed a pointwise optimisation approach to achieve fast and accurate beam deflection.This approach conducts phase calibration,combining global traversal and local searches individually for each array element.We built a phase-calibration optical system containing a one-dimensional optical waveguide phase array for further verification and designed the relevant mechanics.The simulation and experimental results demonstrate that the pointwise optimisation approach accelerates the calibration process and improves the diffraction efficiency. 展开更多
关键词 Beam deflection optical phase array phase calibration
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Optically controlled phase array antenna [Invited] 被引量:1
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作者 Nuannuan Shi Wei Li +1 位作者 Ninghua Zhu Ming Li 《Chinese Optics Letters》 SCIE EI CAS CSCD 2019年第5期72-77,共6页
To overcome the beam squint in wide instantaneous frequency, we review a number of system-level optical controlled phase array antennas for beam forming. The optical delay network based on a fiber device in terms of t... To overcome the beam squint in wide instantaneous frequency, we review a number of system-level optical controlled phase array antennas for beam forming. The optical delay network based on a fiber device in terms of topological structure of an N-bit optical switch, fiber grating, high-dispersion fiber, and vector-sum technology is discussed, respectively. Lastly, an integrated circuit is simply summarized. 展开更多
关键词 optically CONTROLLED phase array ANTENNA WIDE instantaneous FREQUENCY
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Fabrication, Characterization and Optical Properties of TiO2 Nanotube Arrays on Boron-doped Diamond Film Through Liquid Phase Deposition
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作者 YUAN Jujun LI Hongdong +5 位作者 WANG Qiliang CHENG Shaoheng ZHANG Xianke YU Huajun ZHU Xiurong XIE Yingmao 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2014年第1期18-22,共5页
TiO2 nanotube(TiNT) arrays were deposited on boron-doped diamond films by a liquid-phase deposition method with ZnO nanorod arrays as the template.The different morphologies of TiNTs have been obtained by controllin... TiO2 nanotube(TiNT) arrays were deposited on boron-doped diamond films by a liquid-phase deposition method with ZnO nanorod arrays as the template.The different morphologies of TiNTs have been obtained by controlling the morphology of ZnO template.The X-ray diffraction and energy-dispersive X-ray analysis show that the ZnO nanorod array template has been removed in the TiNTs formation process.The crystalline quality of the TiNTs is improved by increasing the annealing temperature.The band gap of the TiNTs is about 3.25 eV estimated by the UV-Vis absorption spectroscopy,which is close to the value of bulk TiO2.In the photoluminescence spectrum,a broad visible emission in a range of ca.550-750 nm appears due to the surface oxygen vacancies and defects. 展开更多
关键词 TiO2 nanotube array Boron doped diamond Lquid phase deposition optical property
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Optimized optical design of thin-film transistor arrays for high transmittance and excellent chromaticity
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作者 Chengzhi Luo Shiyu Long +3 位作者 Guanghui Liu Cooper Min Zhang Fei Ai 《Frontiers of Materials Science》 SCIE CSCD 2020年第1期89-95,共7页
Transmittance and chromaticity are essential requirements for optical performance of thin-film transistor(TFT)arrays.However,it is still a challenge to get high transmittance and excellent chromaticity at the same tim... Transmittance and chromaticity are essential requirements for optical performance of thin-film transistor(TFT)arrays.However,it is still a challenge to get high transmittance and excellent chromaticity at the same time.In this paper,optimized optical design by using antireflection film theory and optical phase modulation is demonstrated in low temperature poly-silicon(LTPS)TFT arrays.To realize high transmittance,the refractive index difference of adjacent films is modified by using silicon oxynitride(SiOxNy)with adjustable refractive index.To realize excellent chromaticity,the thicknesses of multilayer films are precisely regulated for antireflection of certain wavelength light.The results show that the transmittance and chromaticity have been improved by about 6%and 18‰,respectively,at the same time,which is a big step forward for high optical performance of TFT arrays.The device characteristics of the TFT arrays with the optimal design,such as threshold voltage and electron mobility,are comparable to those of conventional TFT arrays.The optimized optical design results in enhanced power-conversion efficiencies and perfects the multilayer film design on the basic theory,which has great practicability to be applied in TFT arrays. 展开更多
关键词 TFT array TRANSPARENT dielectric material CHROMATICITY ANTIREFLECTION film optical phase modulation
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Smith–Purcell radiation-like photoacoustic phased array
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作者 沈冬屹 赵国林 +1 位作者 陈险峰 万文杰 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第4期105-108,共4页
Relativistic electrons moving over a periodic metal grating can lead to an intriguing emission of light,known as Smith–Purcell radiation[SPR],the precursor of the free-electron laser.The speed of light plays a critic... Relativistic electrons moving over a periodic metal grating can lead to an intriguing emission of light,known as Smith–Purcell radiation[SPR],the precursor of the free-electron laser.The speed of light plays a critical role in the far-field emission spectrum.Inspired by this photonic SPR,here we experimentally demonstrate a photoacoustic phased array using laser-induced shock waves.We observe acoustic radiation spectrum in the far field,perfectly predicted by a universal theory for the SPR.This scheme provides a tool to control the acoustic radiation in the near field,paving the way toward coherent acoustic wave generation and microstructure metrology. 展开更多
关键词 nonlinear optics Smith–Purcell radiation laser-induced shock wave photoacoustic phased array
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