Wide Aperture Optical Communications Using Micro-Lens Arrays
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Solution Overview
Problem
Free space optical communication systems face challenges in accurate pointing and tracking, especially with larger or heavier telescopes, which require complex and costly alignment processes, and struggle with wavefront distortion and power distribution in wide angle and high aberration optics, limiting data rate and usability.
Innovation Solution
The use of micro-lens arrays (MLAs) with actuator-controlled motion for beam steering and a wide aperture collection optic, allowing for independent translation and rotation to adjust beam direction and divergence, and a method for unsteered communications using a calibration signal to correct for wavefront distortion and power distribution in a wide angle receiver unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide aperture telescope is used to capture more light, then the light collection capability is improved, but the weight and complexity of the telescope increases
Solution Approach 1:
The patent divides the single large aperture telescope into multiple smaller aperture telescopes working in parallel. Each telescope captures a portion of the light, and their signals are combined to achieve the equivalent light collection capability of a large aperture system, but with reduced individual weight and complexity.
Solution Approach 2:
The patent employs multiple telescopes with nested or adjacent apertures that work together as a unified system. The smaller telescopes are positioned and phased to collectively provide the light gathering power of a larger aperture while maintaining lower individual masses.
2Measurement precision
If traditional pointing and tracking systems are used to align telescopes, then the alignment accuracy can be maintained, but the system complexity and cost increase
Solution Approach 1:
The patent implements self-aligning capabilities where the system automatically acquires and tracks targets without requiring complex external pointing and tracking mechanisms. The multiple telescopes can independently acquire signals and the system autonomously performs phase alignment and signal combination, reducing reliance on heavy mechanical PAT systems.
Solution Approach 2:
The patent replaces complex mechanical pointing and tracking systems with signal processing-based alignment methods. Instead of using heavy mechanical actuators to precisely position telescopes, the system uses electronic phase adjustment and signal correlation to achieve accurate alignment and tracking.
3Productivity
If multiple telescopes are used for spatial division multiplexing, then the data rate is improved, but the alignment and tracking requirements become more stringent
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors the quality of signals from multiple telescopes and dynamically adjusts phase and amplitude parameters to optimize signal combination. This feedback loop maintains precise alignment and coherent combining even as environmental conditions change, enabling reliable spatial division multiplexing at high data rates.
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 solution enables efficient beam steering with low mass and cost optics, allowing for high data rate communications over long ranges with reduced alignment complexity and the ability to receive multiple signals simultaneously, improving spatial division multiplexing and reducing the need for mechanical steering.
Implementation Method 1
lens arrays (a lens array being an array composed of multiple lens elements moved together and typically mutually retained—e.g. (21, 22) by a support structure, and/or by being respective parts of an integral body—in a generally side-to-side configuration) moving relative to each other
Data Source
AI summary
A plurality of electromagnetic radiation capture units are positioned under a focusing unit such as a dome, such that incoming electromagnetic radiation incident on the dome is deflected by it, to reach each of the capture units with a different timing and intensity. The profile for the timings and intensities can be determined for a given transmitter using a calibration signal, and the profile is then used to extra data from data signals transmitted by the transmitter.