Huawei Technologies Co., Limited

The University of British Columbia

Queen's University at Kingston

Huawei Technologies Canada Co., Ltd.

Enxiao Luan

Mahsa Salmani

Lutz Hans-Joachim Lampe

Armaghan Eshaghi

Mitchell Nichols

Sreenil Saha

A method of beamforming by which a signal is received by a crossbar array of phase change materials (PCM) operative to be modulated electronically to impart complex Cartesian weighting and to retain transmission parameters for future processing. A PCM crossbar array can receive a signal from carrier waves modulated by an array of antenna elements, and send a complex Cartesian weighed result to a baseband combiner. Alternatively, a PCM crossbar array can receive a signal from carrier waves modulated by a baseband precoder, and send a complex Cartesian weighed result to an array of antenna elements. Either of the baseband combiner and baseband precoder can be digital or optical. Implementations allow optically based beamforming with the retention of long-term stochastics in the PCM cells, and are therefore broadband, fast, and energy efficient, as channel state information is not required to be stored otherwise.

Systems and methods for beamforming using an array of phase change materials

A photonic device configured to perform matrix vector multiplication operations at high frequencies is provided. The vector being multiplied by the matrix is defined by vector components at specific wavelengths. The device includes a first waveguide and a second waveguide. A series of tunable microring resonators (MRRs) are coupled to the first waveguide and to a respective series of passive delay rings (PDRs), which are coupled to the second waveguide. Each MRR/PDR pair defines a tunable matrix component (tunable weight) for a respective wavelength component of the vector. A series of controllable delay elements (CDEs) such as all-pass filters are coupled to the first waveguide, upstream from the tunable MRRs. Any tuning dependent group delay caused by the MRR/PDR pairs can be compensated by controlling the CDEs such that each wavelength components has substantially a same delay as the other wavelength components.

Systems and methods to maintain phase relations of an optical signal in a photonic dot product engine

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