Zhejiang Lab

Kun Yin

Qingshui Guo

Chen Ji

Xiaojun Ying

Jihou Wang

Discloses a coherent microwave photonics radar detection method and system based on injection locking frequency multiplication. The method uses a baseband signal to modulate an optical carrier to generate a modulated optical signal including a plurality of high-order sidebands; the modulated optical signal is divided into two paths which are respectively injected into two slave lasers for high-order sideband injection locking to obtain two locked sideband optical signals; Based on combining and splitting two locked sideband optical signals, the radar transmitting signal and receiving optical signal can be obtained through photo-detection and electro-optic modulation. After coherent detection of receiving optical signal, obtaining the intermediate frequency signal, and detection target information can be extracted from intermediate frequency signal by radar algorithm.

Coherent microwave photonics radar detection method and system based on injection locking frequency multiplication

The present invention discloses a two-dimensional photonic neural network convolutional acceleration chip based on series connection structure, which is integrated with a modulator, M microring delay weighting units, M−1 secondary delay waveguide, a wavelength-division multiplexer and a photodetector. Based on microring resonator arrays in M microring delay weighting units, the weighting of any convolution kernel matrix coefficient of the signal to be convolved is realized by the present invention, the refresh speed is fast, and real-time feedback training can be realized to extract the optimal convolution kernel matrix; in the present invention, realizing the primary wavelength-time interleaving of the sub weighted modulated signals with different wavelengths through the cascaded integrated waveguide between the microring resonators, realizing the secondary wavelength-time interleaving of sub-weighted modulated signals of different wavelengths by connecting the microring delay weighting units in series through the secondary delay waveguide, which can realize the delay multiplexing of the delay waveguide, comparing to parallel connection structure, it reduces the signal transmission loss caused by the delay waveguide while reducing the chip size, thereby improving the energy utilization efficiency of the chip.

Growing community of inventors

Hangzhou, China

Kun Yin