Ultrabroadband high-resolution silicon RF-photonic beamformer

Area of Science:

• Microwave photonics
• Optical engineering
• Integrated photonics

Background:

• Microwave photonics leverages optical properties to enhance radiofrequency devices, offering low loss, high bandwidth, and interference immunity.
• Beam steering is vital for emerging technologies like the Internet of Things (IoT) and 5/6G networks.
• Existing photonic beamforming architectures face a resolution-bandwidth tradeoff, limiting their performance.

Purpose of the Study:

• To propose and demonstrate a novel switched optical delay line beamformer architecture.
• To overcome the resolution-bandwidth tradeoff in photonic beamforming.
• To enable high-resolution and broadband beam steering for advanced applications.

Main Methods:

• Development of a switched optical delay line beamformer architecture.
• Experimental demonstration using a compact Silicon Photonic chip.
• Implementation of an 8-bit (5-bit) delay line configuration.

Main Results:

• Simultaneous achievement of maximum resolution (2^M pointing angles) and broadband operation.
• Demonstration of 32 distinct pointing angles.
• Achieved 20 GHz bandwidth operation on a compact 8x3 mm^2 chip.

Conclusions:

• The proposed switched optical delay line architecture effectively resolves the resolution-bandwidth tradeoff in photonic beamforming.
• The compact Silicon Photonic chip demonstrates the practical feasibility of this advanced beamforming technology.
• This innovation paves the way for enhanced performance in 5G/6G networks, IoT, and other advanced applications requiring precise beam steering.