Radio-over-fiber communication beamforming device based on arrayed waveguide grating and method thereof

A radio-over-fiber communication beamforming device based on an arrayed waveguide grating, comprising:

• a multi-source laser array, a first wavelength division multiplexer, an electro-optic modulator, a programmable photonic true-time delay module, a second wavelength division multiplexer, a photoelectric detector set, and an antenna array;
• wherein, the multi-source laser array, the first wavelength division multiplexer, the electro-optic modulator, the programmable photonic true-time delay module, the second wavelength division multiplexer, the photoelectric detector set, and the antenna array are successively connected to one another in a cascading manner;
• the programmable photonic true-time delay module is formed by connecting a plurality of optical switches, and a plurality of arrayed waveguide gratings in a sequence alternatively, wherein a number of optical switches in the plurality of optical switches is one more than a number of the array waveguide gratings in the plurality of arrayed waveguide gratings;
• wherein, a first input port of each arrayed waveguide grating is connected to a first output port of an adjacent optical switch placed before the each arrayed waveguide grating in the sequence, a second output port of each optical switch is connected to a second input port of an optical switch following the each optical switch in the sequence, a first output port of each arrayed waveguide grating is connected to a first input port of a next optical switch following the each arrayed waveguide in the sequence;
• each of the plurality of the arrayed waveguide gratings has multiple input ports and multiple output ports, wherein a second input port of the each arrayed waveguide grating is connected to a second output port of the each arrayed waveguide grating, and a third input port of the each arrayed waveguide grating is connected to a third output port of the each arrayed waveguide grating;
• the multi-source laser array is configured to output a plurality of continuous optical carriers of different wavelengths;
• the first wavelength division multiplexer is configured to synthesize the plurality of continuous optical carriers of different wavelengths outputted by the multi-source laser array into one output signal;
• the electro-optic modulator is configured to modulate and output the output signal of the first wavelength division multiplexer by a radio frequency signal;
• the programmable photonic true-time delay module is configured to realize a final delay difference between the optical carriers of different wavelengths in an output signal of the electro-optic modulator by different combinations of on and off states of the plurality of optical switches according to control requirements;
• the second wavelength division multiplexer is configured to process an output signal of the programmable photonic true-time delay module and output optical carriers of different wavelengths;
• and
• the photoelectric detector set and the antenna array are configured to perform a photoelectric conversion on an output signal of the second wavelength division multiplexer to obtain radio frequency signals of different delays or different phases, and the radio frequency signals are sent out through the antenna array to form a far-field beam directional radiation pattern.