Photoconductive Wide-Bandgap Switch Arrays for GHz Modulation
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Solution Overview
Problem
Existing electronic circuits face limitations in achieving high frequency and high voltage modulation due to device limitations in electrical circuit elements, such as capacitances and resistances, which restrict their operating frequencies and efficiency, especially in compact telecommunication equipment.
Innovation Solution
The use of wide bandgap photoconductive materials in optoelectronic modulation systems, where light-induced conductivity is employed to modulate electrical signals, allowing for fast switching and high frequency operations by incorporating photonic components into hybrid circuits, and utilizing parallel connections and optical delays to minimize capacitance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional electrical circuit elements (resistors, capacitors, transistors) are used, then the circuit can be implemented with standard electronic components, but the operating frequency is limited due to device limitations such as capacitances and resistances
Solution Approach 1:
The patent replaces traditional electrical circuit elements with photoconductive switches that use optical fields instead of electrical fields to control conductivity. This substitution eliminates the capacitance and resistance limitations of conventional electronic components, enabling operation at frequencies exceeding 1 GHz. The photoconductive material transitions between conductive and insulating states based on optical input rather than electrical control signals.
Solution Approach 2:
The patent changes the fundamental operating parameter from electrical field control to optical field control. By using photoconductive materials that respond to optical inputs, the system achieves faster switching speeds and higher operating frequencies. The bandgap energy parameter of the photoconductive material is specifically selected to enable rapid response times while maintaining high voltage and current handling capabilities.
2Loss of time
If light paths are split into multiple paths to control time delays, then precise temporal control is achieved, but the optical path complexity increases
Solution Approach 1:
The patent divides the optical path into multiple segmented paths, each leading to a different photoconductive switch. By controlling the length and configuration of each segment, precise time delays are introduced for each switch element. This segmentation allows independent timing control of multiple switches while maintaining a modular and manageable optical system architecture.
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 enables the generation of high frequency signals beyond the limits of traditional electrical circuits, with fast recombination times and reduced capacitance, facilitating high voltage and current handling, and precise temporal control, suitable for applications like compact microwave generation and energy modulation of charged particle beams.
Implementation Method 1
a wide bandgap photoconductive material coupled to a first electrode and a second electrode interfaced at opposite ends of the wide bandgap photoconductive material, in which the wide bandgap photoconductive material conducts an electrical signal between the first and second electrodes when a light signal is transmitted to the wide bandgap photoconductive material
Data Source
AI summary
Methods, systems, and devices for high voltage and/or high frequency modulation. In one aspect, an optoelectronic modulation system includes an array of two or more photoconductive switch units each including a wide bandgap photoconductive material coupled between a first electrode and a second electrode, a light source optically coupled to the WBGP material of each photoconductive switch unit via a light path, in which the light path splits into multiple light paths to optically interface with each WBGP material, such that a time delay of emitted light exists along each subsequent split light path, and in which the WBGP material conducts an electrical signal when a light signal is transmitted to the WBGP material, and an output to transmit the electrical signal conducted by each photoconductive switch unit. The time delay of the photons emitted through the light path is substantially equivalent to the time delay of the electrical signal.