Whispering Gallery Mode Resonator for Compact Optical Modulation
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Solution Overview
Problem
Existing electro-optic modulation techniques for antenna arrays suffer from low bandwidth, low gain, high noise figures, and require high power and large form factors, limiting their applicability in signal processing and imaging applications.
Innovation Solution
The use of whispering gallery mode resonators, made of electro-optic materials, to modulate optical carrier signals based on electrical signals from antenna arrays, enabling compact, high-bandwidth, and low-noise optical processing with minimal electrical power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electro-optic modulators (Mach-Zehnder modulators or polarization rotation modulators) are used to convert electrical signals from antenna arrays to optical domain, then electro-optic modulation can be achieved, but the system exhibits low bandwidth, low gain, high noise figures, and requires high power levels (around 1 Watt) and large form factors
Solution Approach 1:
The patent changes the operating parameters of the electro-optic modulation system by using resonant cavities that trap and circulate optical signals multiple times, effectively increasing the interaction time and enhancing the modulation efficiency. This allows achieving sufficient modulation with much lower input power levels compared to traditional single-pass modulators
Solution Approach 2:
The resonant cavity structure creates periodic circulation of the optical signal, allowing it to interact repeatedly with the electro-optic material. This periodic action accumulates the modulation effect over multiple passes, enabling high gain and low noise figure performance while consuming minimal power
2Reliability
If traditional electro-optic modulators are used for signal conversion, then electro-optic modulation can be achieved, but the system requires large form factors due to significant optical paths required for sufficient modulation
Solution Approach 1:
The patent integrates the electro-optic modulation function directly within compact resonant cavity structures that are coupled to antenna elements. The nested configuration allows the optical path to be folded back on itself multiple times within a small volume, achieving sufficient interaction length without requiring large form factor
Solution Approach 2:
The resonant cavity structure utilizes three-dimensional optical confinement to achieve long effective optical paths within a compact footprint. By guiding light to circulate around the cavity perimeter multiple times, the system packs significant optical path length into a small physical volume, reducing the form factor while maintaining modulation efficiency
3Reliability
If traditional electro-optic modulators are used, then electro-optic conversion can be achieved, but the system exhibits low bandwidth due to limited modulation speed
Solution Approach 1:
The resonant cavity enables high-speed modulation by confining optical energy in a small volume and allowing rapid circulation. The resonant frequency of the cavity can be designed to match the operating frequency of the antenna array, enabling efficient energy transfer and high bandwidth operation through the periodic reinforcement of the modulation signal
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 provides compact, high-bandwidth, and low-noise electro-optic modulation, reducing power consumption and size while enabling efficient optical processing and distribution of signals, suitable for applications like wavelength division multiplexing.
Implementation Method 1
utilize whispering gallery mode resonators made of suitable electro-optic material(s), the electrical signals each antenna array element can be used to modulate optical carrier signals
Implementation Method 2
utilization of optical whispering gallery mode resonators coupled to the outputs of antenna array elements
Data Source
AI summary
Systems are disclosed that utilize electrical signals from detectors of an imaging focal plane array or antenna elements of an antenna array to modulate optical signals. Antenna or focal plane array elements are coupled to optical waveguides by way of whispering gallery mode resonators made of electro-optic material. The resonators modulate optical signals in the waveguides based on the electrical signals from the detectors/antenna elements. The signals received by the array are converted into the optical domain, allowing subsequent optical processing and/or distribution. Each detector/antenna element involved can be identified by the specific wavelength and waveguide through which its signal is coupled, enabling subsequent optical processing of the signals such as by wavelength division multiplexing systems. Additionally disclosed are imaging sensor photonic systems that include WDM components and other optical components such one or more optical narrow-band amplifiers and/or filters. Related electro-optic modulation and tuning methods are also described.