Optical Beamforming Crossbar Arrays for Low-Loss Multi-User RF Links
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Solution Overview
Problem
Current photonics-based beamforming solutions face challenges such as high power consumption, insertion loss, and limited scalability, particularly in supporting multiple data streams, and often rely on large true optical time delay lines, which are not readily extendable to meet the demands of future communication networks.
Innovation Solution
An optical beamforming crossbar array system using photonic components, including input and output optical waveguides, photonic processing components, balanced photodetectors, and electrically controllable light modulators, enables fully-connected beamforming, supporting multiple users and data streams with reduced insertion loss and increased scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional photonics-based beamforming solutions are used, then beamforming capability is achieved, but power consumption increases and insertion loss occurs
Solution Approach 1:
The patent replaces traditional electronic beamforming components with photonic components. Specifically, it uses optical waveguides, photonic switches, and optical modulators to implement beamforming operations that were traditionally performed electronically. This substitution reduces insertion loss and power consumption while maintaining beamforming capability through optical signal processing.
Solution Approach 2:
The patent changes the operating parameters by transitioning from electrical domain to optical domain. It uses optical signals instead of electrical signals for beamforming operations, which fundamentally changes how signal processing is performed. This parameter change enables reduced loss and lower power consumption while achieving the same beamforming function.
2Adaptability or versatility
If existing photonics-based beamforming solutions are used, then beamforming is enabled, but scalability to support multiple data streams is limited
Solution Approach 1:
The patent introduces wavelength division multiplexing (WDM) to add a new dimension to the beamforming system. By using multiple wavelengths simultaneously, the system can support multiple data streams through the same physical infrastructure. This dimensional addition enables scalability without proportionally increasing device complexity, as multiple streams share the same spatial and temporal resources.
Solution Approach 2:
The patent designs a universal photonic beamforming architecture that can handle multiple data streams through wavelength division multiplexing. The same photonic components (waveguides, switches, modulators) serve multiple functions by processing different wavelengths simultaneously. This multi-functionality enables the system to scale to support multiple data streams without requiring separate dedicated paths for each stream.
3Reliability
If true optical time delay lines are used, then beamforming is achieved, but device size increases and scalability is reduced
Solution Approach 1:
The patent extracts and eliminates the need for large true optical time delay lines from the beamforming architecture. Instead of using physical delay lines that occupy significant space, it achieves the same timing functionality through more compact photonic components and signal processing techniques. This extraction of the problematic component directly reduces device volume while maintaining beamforming performance.
Solution Approach 2:
The patent introduces intermediary photonic processing components that mediate between the input signals and the beamforming operation. These intermediaries (such as optical modulators and photonic switches) enable timing and phase control without requiring large physical delay lines. The intermediary components achieve the same functional goals with much smaller footprints.
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 optical beamforming crossbar array system provides efficient and scalable beamforming capabilities, reducing power consumption and insertion loss while enabling concurrent support for multiple data streams, addressing the limitations of existing photonics-based solutions.
Implementation Method 1
a plurality of balanced photodetectors... each configured to convert an optical output signal to an electrical output signal
Implementation Method 2
a plurality of electrically controllable light modulators... each configured to convert a respective electrical input signal to a respective optical input signal
Data Source
AI summary
A photonic apparatus for use in radiofrequency beamforming, with support for multiple users, is provided. An optical crossbar array is coupled to a transmit or receive antenna array. Controllable devices such as attenuators or switches operate to produce complex-weighted versions of optical input signals, and the complex weightings are generated in support of beamforming operations. Delay elements can also be provided to compensate for synchronization losses due to different optical path lengths in the array.