Gimbaled Deformable Mirror Optical Head for Turbulence Correction
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Solution Overview
Problem
Free-space optical communication systems are affected by atmospheric turbulence, leading to reduced coupling efficiency and increased bit-error-rate due to phase aberrations and amplitude fluctuations in laser beams, which existing adaptive optics systems struggle to address effectively, particularly in high-speed data transmission scenarios.
Innovation Solution
The use of a gimbal-mounted deformable mirror (GDM) with a wavefront sensor to correct aberrations in received laser beams, combined with a controller for real-time tracking and aberration correction, and shared optical components for both transmit and receive paths, reduces system complexity and weight while maintaining high data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a deformable mirror is used to correct atmospheric aberrations, then coupling efficiency and tracking accuracy are improved, but device complexity increases
Solution Approach 1:
The patent combines the deformable mirror with a gimbal mechanism into a single integrated unit that performs both aberration correction and beam steering functions. This merging of functions reduces the need for separate components, thereby reducing overall system complexity while maintaining high coupling efficiency and tracking accuracy.
Solution Approach 2:
The deformable mirror is designed to serve multiple functions: correcting atmospheric turbulence-induced aberrations, steering the laser beam for tracking, and adapting to different operational conditions. This multi-functionality eliminates the need for separate dedicated components for each function, reducing device complexity while improving performance.
2Measurement precision
If a wavefront sensor is added to measure and correct aberrations, then tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The wavefront sensor provides real-time measurements of atmospheric aberrations to a control system that adjusts the deformable mirror in feedback loops. This feedback mechanism enables continuous correction of distortions, maintaining high tracking accuracy while the integrated design keeps complexity manageable.
Solution Approach 2:
The wavefront sensor is integrated with the deformable mirror assembly, allowing the measurement and correction functions to operate as a unified system. This integration reduces the need for separate measurement and actuation subsystems, thereby reducing overall device complexity while maintaining precision.
3Speed
If a gimbal mechanism is used for beam steering, then laser beam tracking is improved, but device complexity increases
Solution Approach 1:
The gimbal mechanism is merged with the deformable mirror assembly, allowing the same structural unit to perform both beam steering and aberration correction. This integration reduces the number of separate mechanical and optical subsystems, thereby reducing device complexity while maintaining fast and accurate beam tracking capability.
4Reliability
If atmospheric effects are strong, then communication reliability decreases, but using correction systems increases device complexity
Solution Approach 1:
The deformable mirror is designed with dynamic control capabilities that adapt to varying atmospheric conditions in real-time. The system can adjust the mirror shape and orientation dynamically to compensate for strong turbulence, maintaining communication reliability across changing environmental conditions while managing complexity through intelligent control rather than over-engineering the hardware.
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 GDM-based system enhances coupling efficiency and reduces bit-error-rate by effectively correcting phase aberrations, allowing for stable high-speed data transmission even in turbulent conditions, while minimizing system size and cost.
Implementation Method 1
a wavefront sensor configured to measure a wavefront of the first light beam
Implementation Method 2
a gimbal-mounted deformable mirror (GDM) configurable to correct aberrations of a received laser beam
Implementation Method 3
a collimator configured to couple the second light beam into an optical fiber
Data Source
AI summary
An optical system includes an optical antenna configured to receive and/or transmit laser beams through a first aperture, a gimbal-mounted deformable mirror (GDM) configurable to correct aberrations of a received laser beam, a power selector configurable to split the received laser beam into a first light beam and a second light beam, a wavefront sensor configured to measure a wavefront of the first light beam, a collimator configured to couple the second light beam into an optical fiber, and a controller configured to control the GDM for laser beam tracking and for correcting the aberrations of the received laser beam based on the wavefront of the first light beam measured by the wavefront sensor. The GDM is configurable to scan, within a field of regard (FOR), a beacon beam to be transmitted for laser beam tracking; or scan within the FOR to acquire a beacon beam transmitted by a terminal.