Phase Modulation Active Device for High-Speed Optical Beam Steering
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Solution Overview
Problem
Conventional optical modulators have slow operation response times due to their operational characteristics, limiting their effectiveness in high-speed optical modulation applications, and phase modulation active devices face performance degradation when phase limits are exceeded, leading to reduced optical modulation performance.
Innovation Solution
A phase modulation active device with multiple channels that modulate incident light independently, utilizing a controller to adjust phase modulation target values based on a phase limit, applying modified voltage values to channels exceeding the phase limit to minimize performance degradation, and incorporating a nano array layer with sub-wavelength nano structures for enhanced optical modulation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional optical modulators are used, then optical modulation can be achieved, but operation response time is slow (several microseconds or more)
Solution Approach 1:
The device is divided into multiple independent channels, each capable of phase modulation. This segmentation allows parallel processing of multiple light beams simultaneously, achieving high-speed modulation while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The patent replaces mechanical movement-based modulation (as in MEMS) with phase modulation using meta structures. This substitution eliminates mechanical inertia and friction limitations, achieving response times in the nanosecond range rather than microsecond range
2Manufacturing precision
If phase modulation target value exceeds phase limit, then desired phase modulation is achieved, but performance degradation occurs
Solution Approach 1:
The controller monitors the phase limit of each channel and provides feedback to adjust the phase modulation target values. When a channel approaches its phase limit, the controller automatically modifies subsequent modulation commands to stay within operational bounds, preventing performance degradation while maintaining precision
Solution Approach 2:
Instead of attempting to push each channel to its maximum phase limit (excessive action), the system applies partial modulation that stays within safe operational margins. This approach maintains reliable performance while achieving sufficient modulation precision for optical processing tasks
3Speed
If meta structure with sub-wavelength dimensions is used, then high response speed is achieved, but device fabrication complexity increases
Solution Approach 1:
The patent optimizes the size, shape, and arrangement parameters of meta structures to achieve sub-wavelength phase modulation. By carefully selecting parameters such as meta-structure dimensions and spacing, the system achieves high-speed modulation while maintaining compatibility with standard semiconductor fabrication processes
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 solution enables improved optical modulation performance by reducing performance degradation due to phase limits, achieving high-speed modulation and efficient beam steering, focusing, and beam splitting, while maintaining desired optical characteristics.
Implementation Method 1
a phase modulator including a plurality of channels CH_1 through CH_N, each channel configured to modulate a phase of incident light Li independently from other channels
Data Source
AI summary
A phase modulation active device and a method of driving the same are provided. The method may include configuring, for the phase modulation active device including a plurality of channels that modulate a phase of incident light, a phase profile indicating a phase modulation target value to be implemented by the phase modulation active device; setting a phase limit value of the phase modulation active device; generating a modified phase profile based on the phase profile by modifying the phase modulation target value, for at least one channel from the plurality of channels that meets or exceeds the phase limit value, to a modified phase modulation target value that is less than the phase limit value in the phase profile; and operating the phase modulation active device based on the modified phase profile. Thus, improved optical modulation performance may be achieved.