Silicon Photonic Multi-Beam Chip for Radar Stability
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Solution Overview
Problem
Current microwave photonic multi-beamforming technologies face challenges with large system size, poor stability, and limited flexibility due to the use of discrete devices, which restricts the capability for high-resolution, ultra-wideband, and reconfigurable beam formation in phased array radars.
Innovation Solution
A silicon-based reconfigurable microwave photonic multi-beam forming network chip is developed, incorporating an optical fiber coupler, optical switch array, ultra-wideband continuously adjustable optical true delay line array, and detector array, enabling independent adjustment of beam delays and reconfigurable beam formation with integrated photonic technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete devices are used for microwave photonic multi-beamforming, then the system can achieve beam forming functionality, but the system size becomes large and stability deteriorates
Solution Approach 1:
The patent integrates multiple discrete photonic devices (modulators, delay lines, beamformers) into a single integrated photonic chip. This merging eliminates the need for discrete device connections, reducing system size while improving stability through monolithic integration. The integrated chip consolidates all beamforming functions into one compact unit, directly resolving the contradiction between system size and stability.
2Adaptability or versatility
If discrete devices are used for microwave photonic multi-beamforming, then the system can achieve beam forming functionality, but the device complexity increases
Solution Approach 1:
The integrated photonic chip is designed with reconfigurable beamforming capabilities that can dynamically adjust beam directions and form multiple beams simultaneously. The universal design allows the same chip to perform various beamforming operations (single-beam, multi-beam, directional steering) without requiring additional discrete components, thus improving adaptability while managing complexity through integration.
Solution Approach 2:
The patent implements dynamically reconfigurable beamforming through integrated photonic switches and phase shifters that can change beam patterns in real-time. This dynamic capability allows the system to adapt to different operational requirements (different beam directions, different numbers of beams) without physical reconfiguration, enhancing versatility while keeping the device structure compact and manageable.
3Quantity of substance
If conventional delay lines are used, then the system can achieve time delay functionality, but the bandwidth is limited and the system size increases
Solution Approach 1:
The patent replaces conventional mechanical or electrical delay lines with photonic-based delay mechanisms integrated on the chip. This substitution uses optical field propagation through waveguides with controlled path lengths to achieve time delays, providing ultra-wideband performance (up to several GHz) while maintaining a compact footprint. The photonic approach eliminates the bandwidth limitations and size constraints of conventional delay lines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves high-resolution, reconfigurable multi-beam formation with improved flexibility and reduced size and power consumption, enhancing the performance and practicality of microwave photonic radar systems by utilizing integrated photonic technology.
Implementation Method 1
an optical fiber coupler, configured for inputting a single-sideband modulated optical signal of a microwave photonic phased array radar
Implementation Method 2
an optical switch array and optical divider, configured for forming the reconstruction of the number of array elements used for a microwave photonic multi-beam and a microwave photonic single-beam
Implementation Method 3
an optical switch array and optical divider, configured for forming the reconstruction of the number of array elements
Implementation Method 4
an ultra-wideband continuously adjustable optical true delay line array, configured for independently adjusting the delay on each microwave array element
Implementation Method 5
a detector array, configured for outputting a microwave signal
Implementation Method 6
inputting a single-sideband modulated optical signal of a microwave photonic phased array radar
Data Source
AI summary
A silicon-based reconfigurable microwave photonic multi-beam forming network chip comprises an optical fiber coupler, an optical switch array, an optical divider, an ultra-wideband continuously adjustable optical true delay line array and a detector array; the optical fiber coupler is configured for inputting a single-sideband modulated optical signal of a microwave photonic phased array radar; the optical switch array and optical divider are configured for forming the reconstruction of the number of array elements used for a microwave photonic multi-beam and a microwave photonic single-beam; the ultra-wideband continuously adjustable optical true delay line array is configured for independently adjusting the delay on each microwave array element; and the detector array is configured for outputting a microwave signal. The chip provides large instantaneous bandwidth, high resolution, and reconfigurable microwave photonic multi-beam forming for the microwave photonic phased array radar.