公开(公告)号：US20240219631A1

公开(公告)日：2024-07-04

申请号：US18608568

申请日：2024-03-18

Applicant: Shanghai Jiao Tong University

Inventor： Liangjun LU ,  Ziheng NI ,  Linjie ZHOU ,  Jianping CHEN ,  Jiao LIU

IPC: G02B6/12 ,  G01S7/481 ,  G01S17/02

CPC classification number: G02B6/12011 ,  G01S7/4818 ,  G01S17/02 ,  G02B6/12004

Abstract: A silicon-based reconfigurable microwave photonic multi-beam forming network chip comprises an optical fiber coupler, an optical switch array, an optical divider, an ultra-wideband continuously adjustable optical true delay line array and a detector array; the optical fiber coupler is configured for inputting a single-sideband modulated optical signal of a microwave photonic phased array radar; the optical switch array and optical divider are configured for forming the reconstruction of the number of array elements used for a microwave photonic multi-beam and a microwave photonic single-beam; the ultra-wideband continuously adjustable optical true delay line array is configured for independently adjusting the delay on each microwave array element; and the detector array is configured for outputting a microwave signal. The chip provides large instantaneous bandwidth, high resolution, and reconfigurable microwave photonic multi-beam forming for the microwave photonic phased array radar.

公开(公告)号：US20220187129A1

公开(公告)日：2022-06-16

申请号：US17561679

申请日：2021-12-23

Applicant: Shanghai Jiao Tong University

Inventor： Liangjun LU ,  Junjie DU ,  Linjie ZHOU ,  Jianping CHEN ,  Jiao LIU

IPC: G01J3/45 ,  G01J3/18

Abstract: A silicon Fourier transform spectrometer and an optical spectrum reconstruction method are disclosed. The spectrometer includes a waveguide input coupler, cascaded optical switches, unbalanced subwavelength grating (SWG) waveguide pairs, and a germanium silicon detector, where the cascaded optical switches are connected through unbalanced SWG waveguide pairs. The state of the optical switches are adjusted to digitally configure the optical path, so as to constitute a series of unbalanced Mach-Zehnder interferometer (MZI) arrays with different optical path differences, to realize a Fourier transform spectrometer based on spatial heterodyne. The optical spectrum is reconstructed by using a compressed sensing algorithm.

公开(公告)号：US20240337536A1

公开(公告)日：2024-10-10

申请号：US18413015

申请日：2024-01-15

Applicant: Shanghai Jiao Tong University

Inventor： Liangjun LU ,  Tianyu CHENG ,  Linjie ZHOU ,  Jianping CHEN ,  Jiao LIU

IPC: G01J3/45 ,  G01J3/453 ,  G02F1/21 ,  G02F1/225

CPC classification number: G01J3/45 ,  G02F1/212 ,  G02F1/2252 ,  G01J2003/4538

Abstract: An on-chip Fourier transform spectrometer based on a double-layer spiral waveguide comprises, in order, a waveguide input coupler, a 1×N optical splitter, N double-layer waveguide Y-branch structures, N double-layer spiral waveguides with incremental lengths, N double-layer waveguide Y-branch structures arranged in opposite directions, and N germanium-silicon detectors. The group index difference between the odd mode and the even mode in the double-layer waveguide makes the double-layer spiral waveguide function like an asymmetric Mach-Zehnder interferometer. N double-layer spiral waveguides with incremental lengths are used to achieve a spatial heterodyne based Fourier transform spectrometer. Spectral reconstruction from the measured interference fringes can be achieved by a regression algorithm. The invention meets the application need for miniaturization and portability of Fourier transform spectrometers, and has lower temperature sensitivity compared with the existing on-chip spectrometers on the silicon platform.

公开(公告)号：US20220197106A1

公开(公告)日：2022-06-23

申请号：US17561907

申请日：2021-12-24

Applicant: Shanghai Jiao Tong University

Inventor： Liangjun LU ,  Weihan XU ,  Linjie ZHOU ,  Jianping CHEN ,  Jiao LIU

IPC: G02F1/29 ,  G02F1/295 ,  G01S7/481 ,  G01S7/497

Abstract: A calibration system and related methods for optical phased array chips. The calibration system includes an adjustable mount module, an infrared microscopic observation module, an arrayed driver module, a two-dimensional laser beam scanning module, a photoelectric conversion module and an upper computer, and utilizes computer-vision-enabled positioning and phase error compensation algorithms as software components. Collimated laser is emitted from the target beamforming angle and aimed at the emission aperture of the chip, and is subsequently sampled by the array elements in a reversed injection manner. Based on the reciprocity of light propagation, by maximizing the power reversely output from the bus waveguide of the optical phased array chip, beamforming at the target angle is achieved supported by software implementations of optimization algorithms. The system and related methods are readily achievable, highly automated, and offers fast and batch calibration with relatively low expenses, good flexibility and long-term compatibility.

公开(公告)号：US20210018603A1

公开(公告)日：2021-01-21

申请号：US17061126

申请日：2020-10-01

Applicant: Shanghai Jiao Tong University

Inventor： Liangjun LU ,  Chen ZHU ,  Linjie ZHOU ,  Jiao LIU ,  Jianping CHEN

IPC: G01S7/4911 ,  G01S7/481 ,  G02B6/12

Abstract: Integrated two-dimensional multi-beam LiDAR transmitter based on the Butler matrix, comprising an tunable laser array, a frequency modulated continuous wave modulator array, an N×N Butler optical matrix network, an N×M optical beam expanding network, an M-path phase shifter array, and an M-path two-dimensional LiDAR emitters. N-path narrow linewidth continuous light output by the tunable laser array passes through the frequency modulated continuous wave modulator array to generate N-path frequency modulated continuous light signals; after processed by the N×N Butler matrix and the N×M optical beam expanding network, energy of each path of the frequency modulated continuous optical signal is evenly distributed to the M-path output ports, and the M-path phase shifter array generates equal-difference phases with continuously tunable phase differences for M-path optical signals, which, with continuously tunable phase differences, are transmitted by M-path two-dimensional LiDAR emitters to realize no more than N different two-dimensional steerable transmitting optical beams.

公开(公告)号：US20190319633A1

公开(公告)日：2019-10-17

申请号：US16132202

申请日：2018-09-14

Applicant: Shanghai Jiao Tong University

Inventor： Weiwen ZOU ,  Shaofu XU ,  Jianping CHEN

IPC: H03M1/10 ,  G06N3/08 ,  G06K9/62 ,  H03M1/08 ,  H03M1/12

Abstract: A method for noise suppression and distortion correction of analog-to-digital converters based on deep learning that realizes effect of correcting noise and distortion of analog to digital converters. The method is applied to electronic ADCs or photonic ADCs. It utilizes the learning ability of the deep network to perform system response learning on ADCs which need noise suppression and distortion correction, establishes a computational model in the deep network that can suppress the reconstruction of noises and distorted signals, performs noise suppression and distortion correction on the signals obtained by ADCs, and thereby improves performance of the learned ADCs. The present invention has a very important role in improving the performance of the microwave photon system with high sampling precision of microwave photon radar and optical communication system.

公开(公告)号：US20190318236A1

公开(公告)日：2019-10-17

申请号：US16132259

申请日：2018-09-14

Applicant: Shanghai Jiao Tong University

Inventor： Weiwen ZOU ,  Lei YU ,  Shaofu XU ,  Bowen MA ,  Jianping CHEN

IPC: G06N3/067 ,  G06N3/08 ,  G06N3/04

Abstract: Method and system for intelligent decision-making photonic signal processing, where the system comprises a multi-functional input unit, an electro-optical conversion module, a signal processing module, a photoelectric conversion module, a multi-functional output unit, and an artificial intelligence chip. The invention combines the advantages of photonic high-speed, wide-band, and electronic flexibility, combined with heterogeneous photoelectron hybrid integration, packaging and other processes, along with deep learning algorithm, is an intelligent electronic information system that may simultaneously realize digital and analog signal processing.

公开(公告)号：US20230188216A1

公开(公告)日：2023-06-15

申请号：US17941012

申请日：2022-09-08

Applicant: Shanghai Jiao Tong University

Inventor： Liang HU ,  Qi LI ,  Guiling WU ,  Jiao LIU ,  Jianping CHEN

IPC: H04B10/43 ,  H04B10/25

CPC classification number: H04B10/43 ,  H04B10/25891

Abstract: An optical millimeter wave terahertz transfer system and transfer method are disclosed. The device comprises a local terminal, a transfer link, an access terminal, and a user terminal. By using the device in the transfer link, optical signals transferred forward and backward are extracted through optical couplers, and millimeter wave terahertz signals with a stable phase are obtained at any position in the transfer link through optical signal filtering, photovoltaic conversion, microwave filtering, frequency division and optical frequency shift processing. The device and method have the characteristics of high reliability, simple structure, and low implementation cost.

公开(公告)号：US20200083961A1

公开(公告)日：2020-03-12

申请号：US16686402

申请日：2019-11-18

Applicant: Shanghai Jiao Tong University

Inventor： Guiling WU ,  Sitong WANG ,  Yiwei SUN ,  Jianping CHEN

IPC: H04B10/69 ,  H04L7/00

Abstract: A waveform matching based optical digital signal receiving device sequentially comprises an optical arbitrary waveform generator unit, an electro-optic modulator unit, an opto-electric converter unit, an electric filter unit, a sampling and judging module, a digital signal processing unit and a bit-timing extracting module. Accordingly, signal matched filtering, sampling and judgment can be effectively carried out in the optical domain, and the influence of noises on signal reception can be eliminated to the maximum extent, thereby achieving accurate detection and reception of signals. Meanwhile, compared with a conventional electric receiving device, the digital signal receiving device provided by the present invention breaks the limitation of “electronic bottleneck,” and greatly improves the bandwidth of signal reception, which allows digital signal reception at a higher speed.

公开(公告)号：US20210373162A1

公开(公告)日：2021-12-02

申请号：US16994383

申请日：2020-08-14

Applicant: Shanghai Jiao Tong University

Inventor： Kan WU ,  Chao LI ,  Xianyi CAO ,  Jianping CHEN

IPC: G01S17/894 ,  G01S7/481

Abstract: Lidar detection device based on a lens and an integrated beam transceiver, comprising a laser, a coupling fiber, a substrate, an input waveguide, a connection waveguide, a 1×N optical switch, a switch electrical interface, N switch output waveguides, N transceiving units, an off-chip processor and a lens, wherein N is a positive integer above 2. The invention can realize three-dimensional detection of a target, and the invention has the characteristics of two-dimensional beam steering independent of wavelength switching, low control complexity, low electric power consumption, receiving and emitting monolithic integration and high receiving efficiency, and being compatible with two laser ranging functions of ToF and FMCW.