Shanghai Jiaotong University

Weiwen Zou

Jianping Chen

Shaofu Xu

Jing Wang

Hao Kai Zhang

Lei Yu

Guang Yang

Na Qian

Liang Hu

Guiling Wu

Hao Zhang

Jianguo Shen

Huajie Zhang

Bowen Ma

Siteng Zhang

Shiyu Hua

Shaoyang Zhang

Sicheng Yi

Yuting Chen

Shuo Yang

Xin Long

Chenjun Liu

Anliang Yu

A high-precision analog optical computing method and system based on bit slicing comprises decomposing high-precision signals into low-precision signal segments, decomposing high-precision weights into multiple low-precision weight segments, performing low-precision signal and weight multiplication operations in the optical domain respectively, and finally combining these low-precision calculation results to restore high-precision output. By splitting high-precision data into multiple low-precision bit slices for processing, it takes advantage of high-speed parallel characteristics of photonic computing to simultaneously handle multiple input bit slices and weight bit slices, improves computational efficiency of large-scale computing tasks and reduces the hardware requirements for optical computing. By adjusting values of M and N, it flexibly adapts to computing tasks of different scales and precisions, demonstrating strong adaptability and flexibility. It achieves balance between computational accuracy and hardware complexity, and fully exploits parallel processing advantages of photons, providing solutions for large-scale data processing and efficient optical domain computing.

High precision analog optical computing method and system based on bit slice

An optical sampling signal holding method for a photonic analog-to-digital conversion system, based on frequency response principles of sampling and holding, controls photoelectric conversion processes after photonic sampling to be equivalent to the signal holding effect in switch sampling, and converts sampled optical pulses into a special holding waveform, directly eliminating the time mismatch between back-end electronic analog-to-digital converters and optical pulses. The photoelectric conversion frequency responses in the invention do not lead to additional expenses on active devices and software, which greatly improves performances of the photonic analog-to-digital conversion system. The method is not limited by the number of channels, and can provide more reliable technical solutions for realizing a photonic analog-to-digital conversion system with high sampling rate in the future.

Optical sampling signal holding method for photonic analog-to-digital conversion system

A high-speed and low-voltage electro-optical modulator based on a lithium niobate-silicon wafer. A silicon wafer is located above a lithium niobate wafer; a lithium niobate-silicon hybrid waveguide is formed by etching a silicon waveguide; and the power of light waves is differently distributed in the lithium niobate-silicon hybrid waveguide by changing the structure of the silicon waveguide. When higher power is distributed in the silicon waveguide, the high-speed and low-voltage electro-optical modulator is suitable for realizing a compact wave splitting function, a wave combining function and a thermo-optical modulation function; and when higher power is distributed in the lithium niobate waveguide, the high-speed and low-voltage electro-optical modulator is suitable for realizing a high-speed and low-voltage electro-optical modulation function. The present invention takes advantage of the lithium niobate and silicon material platforms respectively, and is suitable for high-speed and low-voltage electro-optical modulation.

High-speed and low-voltage electro-optical modulator based on lithium niobate-silicon wafer

A monolithically integrated optical analog-to-digital conversion system based on a lithium niobate-silicon wafer, and a method for manufacturing the same, wherein a novel wafer (lithium niobate-silicon wafer) is used to implement the monolithically integrated optical analog-to-digital conversion system having multiple photonic devices, including an electro-optical modulator array, a tunable delay line array, an electronic circuit, and the like. As a result, multiple devices are manufactured on one chip, and the performance advantages and the stability of the system are guaranteed. Moreover, the present invention provides a CMOS-compatible method for manufacturing the system, so that the monolithically integrated optical analog-to-digital conversion system based on the lithium niobate-silicon wafer can be implemented on platforms of most chip manufacturers.

Monolithically integrated optical analog-to-digital conversion system based on lithium niobate-silicon wafer and method for manufacturing the same

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.

Method and system for intelligent decision-making photonic signal processing

Integration method of a large-scale silicon-based lithium niobate film electro-optic modulator array. By using the method, the difficulty of a fabrication process of a lithium niobate crystal layer is reduced, requirements on precision of bonding lithium niobate and silicon is reduced, and fabrication and bonding of the large-scale array lithium niobate crystal layer can be completed at one time, so that production efficiency of the silicon-based lithium niobate film electro-optic modulator array is greatly improved; through design and optimization of the structure of the silicon crystal layers, light can be naturally alternated and mutually transmitted in silicon waveguides and lithium niobate waveguides, and a high-performance electro-optic modulation effect of the lithium niobate film is achieved.

Silicon-based lithium niobate film electro-optic modulator array and integration method thereof

A device 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 device improves the performance of the microwave photon system with high sampling precision of microwave photon radar and optical communication system.

Deep learning based method and device for noise suppression and distortion correction of analog-to-digital converters

A coherent photon analog-to-digital conversion device comprising an optical clock oscillation source, a sampled signal source, a photon sampling gate, a photoelectric detection module, an electrical sampling module, a phase detection module, a loop filter, and signal feedback links. By adjusting the optical clock oscillating source or the sampled signal source, the invention makes the two highly coherent, thereby reducing the clock jitter and greatly improving the sampling precision. It is very important for improving the performance of microwave photon systems that require high time accuracy and high sampling accuracy, such as microwave photon radar and optical communication systems.

Coherent photon analog-to-digital conversion device

A high-speed and high-precision photonic analog-to-digital conversion device capable of realizing intelligent signal processing. Learning ability of deep learning technology is utilized to learn the nonlinear response and channel mismatch effect of the system and configure optimal parameters of the deep network. Deterioration of photonic analog-to-digital conversion system performance caused by nonlinear distortion and channel mismatch distortion is eliminated in real time, and performance indicators thereof are improved. By using the induction and deduction ability of deep learning technology, intelligent signal processing of the input signal is realized, and users are provided with digital signals that meet the requirements. It's important for improving the performance of microwave photonic systems that require high sampling rate, high time precision, and high sampling accuracy, such as microwave photonic radar and optical communication systems, and also critical to improve the signal processing ability of such systems under complex conditions.

High-speed and high-precision photonic analog-to-digital conversion device and method for realizing intelligent signal processing using the same

A full-spectrum covering ultra wideband full-photonics based radar system comprising a signal transmitter, a transceiver module, and a signal receiver. The signal transmitter comprises a mode-locked laser, a first dispersion module, a first optical coupler, a second optical coupler, a first optical filter, a second dispersion module, a second optical filter, a first adjustable time delay module, a third optical coupler, an optical amplifier, and a first photodetector; the transceiver module comprises a band selector, a first electrical amplifier array, a T/R component array, an antenna array, and a second electrical amplifier array; the signal receiver comprises a third optical filter, a second adjustable time delay module, an electro-optical modulator, a third dispersion module, a second photodetector, an analog-digital conversion module, and a signal processing module. The system has continuous tunability for center frequency, bandwidth, and time width of the wideband signal with high coherence and ranging accuracy.

Full-spectrum covering ultra wideband all photonics-based radar system

The present invention relates to a measuring and compensating method for channel mismatch of an ultra-high speed time-wavelength interleaved optical pulse sequence, by employing a generating module of the to-be tested ultra-high speed time-wavelength interleaved optical pulse sequence, an optical spectrum measuring module, an electrical frequency measuring module, and a data analyzing and processing module. The present invention obtains mismatch information of the pulse sequence for each channel by means of measurement and analysis of the ultra-high speed time-wavelength interleaved optical pulse sequence, thus overcoming the bottleneck of inadequate sampling of time-domain observation via an oscilloscope. The channel mismatch information obtained by the present invention may act as a basis for channel mismatch compensation and correction for the ultra-high speed time-wavelength interleaved optical pulse sequence.

Method for measuring multi-channel mismatch of ultra-high speed photonic sampler and measurement compensation device thereof

Generator for wholly optical tunable broadband linearly chirped signal comprising a mode-locked laser, a first optical coupler, a first optical filter, a first dispersion module, a second optical filter, a second dispersion module, a tunable time delay module, a second optical coupler, an optical amplifier, and a photodetector. The generator of the present invention employs just one mode-locked laser as a light source, thus preventing instability of the generated signal resulting from independent unrelated lasers. By making use of the principle of wavelength-time mapping and by means of adjusting the center wavelength and the filter bandwidth of the first optical filter and the second optical filter, easy and flexible tuning of the center frequency and sweep bandwidth of the generated linearly chirped signal is realized. The present invention possesses a big advantage on the aspect of generating a broadband linearly chirped signal over other solutions.

Generator for wholly optical tunable broadband linearly chirped signal

An optical pulse compression reflectometer is provided, which comprises: a single wavelength continuous optical source, an optical splitter, a modulation frequency pulse generating module, an optical directional coupler, an optical fiber under test, an optical coupler, a balanced photoelectric detector, and a pulse compression processing module. The present invention, in addition to overcoming the contradictory constraint between spatial resolution and measurement range in traditional time domain reflectometry and giving to full play the super spatial resolution from frequency modulation technology, has a longer measurement range than that in the optical frequency domain reflectometry.

Optical pulse compression reflectometer

A wholly optically controlled phased array transmitter with integrated tunable optoelectronic oscillators, which are based on multi-wavelength optical sources and optical true time delay units, and optical time delay networks, having a multi-wavelength optical source, a first wavelength division multiplexer, a first optical splitter, a first electro-optic modulator, a second optical splitter, a first optical amplifier, a first optical time delay network, a photodetector, an electric amplifier, a DC-block, a second electro-optic modulator, a second optical amplifier, a second optical time delay network, an optical combiner, a second wavelength division multiplexer, an optical fibers, a photodetector array, a T/R component array, a microwave antenna array, a 1&#xd7;2 optical switch, a 2&#xd7;2 optical switch, a circulator, a third wavelength division multiplexer, a bundle of optical fibers with precise lengths, and a Faraday rotation mirror.

Wholly optically controlled phased array radar transmitter

A format for modified IRIB-G time code, with added message fields while preserving pulse width coding rule of the standard IRIG-B time code, having a time interval field for carrying time interval between the local time signal and a received time signal, and a user-defined or padded field for carrying user-defined time and/or control messages. An encoding and a decoding methods and devices for high-precision time transfer, where the modified IRIG-B time code carries more messages, and enabling transmission of timing messages and testing messages of two-way time comparison via a single message channel at the same time, which reduces fluctuation due to encoding and decoding manipulation and correlation with working frequencies via exact synchronization between the on-times of the output encoded time code and the transmitted time signal, and between the on-times of the output decoded time signal and the input time code, and improves precision of time transfer.

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Shanghai, China

Weiwen Zou