Capacitive Phase Modulators for Optical Phased Arrays
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Solution Overview
Problem
Optical phased arrays face high DC power consumption and heat dissipation issues due to phase shifters, which hinder scalability and power efficiency in applications like free-space data communications and LIDAR, and resonance-based data modulation schemes consume more power for wavelength tuning.
Innovation Solution
The use of capacitive phase modulators with p-type and n-type semiconductor regions and χ(2) insulating dielectric material, such as organic polymers, eliminates static DC power consumption by employing capacitive elements that modulate phase shifts dynamically, reducing power requirements and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thermal heaters are used to shift resonance wavelength in ring resonators, then resonance wavelength tuning is achieved, but static DC power consumption increases
Solution Approach 1:
The patent replaces thermal heating mechanisms with electro-optic modulation using χ(2) nonlinear materials. Instead of using thermal heaters to shift resonance wavelengths, the invention employs electric field-induced refractive index changes in ferroelectric or nonlinear optical materials to achieve phase and wavelength modulation without thermal effects, thereby eliminating static DC power consumption associated with thermal tuning.
Solution Approach 2:
The invention changes the physical mechanism from thermal parameter changes (temperature-induced resonance shifting) to electro-optic parameter changes (electric field-induced refractive index modulation). By utilizing the χ(2) nonlinear optical effect, the system achieves wavelength tuning through voltage-controlled refractive index changes rather than temperature-controlled resonance shifting, reducing power consumption.
2Ease of operation
If phase shifters consume high DC power for operation, then phase modulation is achieved, but heat dissipation increases and scalability is hindered
Solution Approach 1:
The patent substitutes conventional resistive or thermal phase shifters with capacitive phase modulators based on χ(2) nonlinear materials. These capacitive modulators achieve phase modulation through electric field-induced refractive index changes without resistive heating, eliminating the heat dissipation problem associated with high DC power consumption in traditional phase shifters.
Solution Approach 2:
The invention employs periodic or dynamic voltage application to capacitive phase modulators rather than continuous DC power supply. By using AC or pulsed voltage signals synchronized with the optical modulation requirements, the system achieves phase modulation only when needed, reducing average power consumption and associated heat dissipation compared to continuous DC operation.
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 significantly reduces overall power consumption and heat dissipation, enabling more efficient and scalable optical phased arrays with reduced speckle artifacts in imaging systems, while allowing for fast modulation speeds and compact form factors.
Implementation Method 1
a χ(2) insulating dielectric material disposed between the p-type and n-type semiconductor regions
Data Source
AI summary
An electro-optical includes, in part, a multitude of phase modulators each of which includes, in part, a p-type semiconductor region, an n-type semiconductor region, and a χ(2) insulating dielectric material disposed between the p-type and n-type semiconductor regions. The electro-optical device may be a phased array in which each phase modulator is associated with a different one of the transmitting elements of the phased array. The χ(2) insulating dielectric material may be an organic polymer. The electro-optical device may further include, in part, a multitude of sensors each associated with a different one of the phase modulators. Each sensor is adapted to receive a phase modulated signal generated by the sensor's associated phase modulator. The electro-optical device may further include, in part, a multitude of amplitude modulators each associated with a different one of the multitude of phase modulators.