Optical Modulators for RF Phased-Array Data Aggregation
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Solution Overview
Problem
Large phased arrays in wireless communication networks face challenges in data aggregation, power distribution, and flexibility due to complexity, cost, power consumption, and bandwidth limitations, especially as array size increases and transmission distances lengthen.
Innovation Solution
The system employs optical modulators, optical fibers, and photovoltaic power converters to modulate and aggregate RF data optically, reducing mass and enhancing flexibility by using optical signals for data and power distribution within the phased array, eliminating the need for electrical power lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical aggregation and combining of high-speed data streams across multiple array elements is used, then data reception capability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the electrical aggregation network with an optical field-based combining mechanism. Multiple RF signals are converted to optical signals and combined in the optical domain using photodetectors, eliminating the need for complex electrical delay lines, phase shifters, and transmission lines. This substitution of electrical systems with optical systems resolves the contradiction by maintaining data reception capability while dramatically reducing device complexity.
2Productivity
If array size increases to improve gain and beamforming capabilities, then reception performance is improved, but power consumption and mass increase
Solution Approach 1:
The patent replaces electrical power distribution infrastructure with optical power transmission using laser diodes and optical fibers. This eliminates the need for heavy electrical wiring and power management circuitry across the array elements. The optical power delivery system provides energy to remote array elements with minimal loss, enabling larger arrays to be deployed without proportionally increasing power consumption or mass.
3Reliability
If wired connections are used for power and data distribution, then reliability is improved, but adaptability and flexibility decrease
Solution Approach 1:
The patent implements a dual-function optical infrastructure where the same optical fiber network simultaneously carries both power delivery and data communication signals. This multi-functional approach eliminates the need for separate electrical wiring for power and data, enabling the array to be reconfigured, relocated, or scaled without being constrained by fixed electrical connections. The optical system provides both reliable signal transmission and the flexibility to dynamically reconfigure the array topology.
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
This approach simplifies the construction and scaling of phased arrays, lowers cost and power consumption, and increases bandwidth while providing a flexible and dynamic network capable of handling high-speed data transmission over long distances.
Implementation Method 1
an optical modulator adapted to modulate an optical signal in accordance with data received by a corresponding one of the plurality of receivers to generate a modulated signal
Implementation Method 2
a photovoltaic power converter adapted to convert the optical signal to electrical power to provide power to the plurality of receivers
Data Source
AI summary
A system includes, in part, a multitude of RF receivers, a first optical modulator adapted to modulate an optical signal in accordance with a first data received by a first one of RF receivers to generate a first modulated signal, a second optical modulator adapted to modulate the optical signal in accordance with a second data received by a second RF receiver to generate a second modulated signal, and a first optical fiber adapted to carry the first and second modulated signals. The optical modulator may be a photodiode or a Mach-Zehnder modulator.