Model-Based Multi-Aperture Optical Fiber Coupling for Turbulence Control
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Solution Overview
Problem
Existing optical fiber coupling systems in free space optical communication are hindered by atmospheric turbulence, leading to inefficient laser signal transmission due to slow convergence of stochastic parallel gradient descent algorithms, necessitating faster control methods to enhance coupling efficiency.
Innovation Solution
A model-based adaptive multi-aperture optical fiber coupling system utilizing a control algorithm that establishes a mathematical relationship between far-field light spots and wavefront aberrations, incorporating a controller, high-voltage amplifier, and optical fiber couplers to rapidly identify optimal control parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stochastic parallel gradient descent algorithm is used to control optical fiber coupler array, then optical fiber coupling efficiency is improved, but convergence speed is slow
Solution Approach 1:
The patent transforms the control problem from direct wavefront parameter optimization to far-field light spot position optimization. By changing the optimization parameter from complex wavefront aberrations to simple light spot coordinates (x, y), the system achieves faster convergence while maintaining coupling efficiency. The mathematical relationship between light spot position and wavefront aberration serves as the transformation bridge.
Solution Approach 2:
The patent introduces far-field light spot position as an intermediary variable between the control algorithm and wavefront aberration correction. Instead of directly optimizing wavefront parameters, the system first optimizes light spot position, which then indirectly controls wavefront correction. This intermediary approach simplifies the optimization landscape and accelerates convergence.
2Productivity
If atmospheric turbulence is present in laser transmission path, then signal transmission occurs, but coupling efficiency is greatly reduced
Solution Approach 1:
The patent implements a feedback control mechanism where the far-field light spot position is continuously monitored and used to adjust the optical fiber coupler array. The control algorithm calculates the deviation of light spot from the optimal position and generates correction signals to real-time compensate for atmospheric turbulence effects, maintaining high coupling efficiency despite turbulent conditions.
Solution Approach 2:
The patent performs preliminary transformation of the control problem by establishing the mathematical relationship between far-field light spot position and wavefront aberration before actual correction begins. This pre-established model enables the system to quickly respond to turbulence by directly computing required corrections from light spot position measurements, rather than searching through complex parameter spaces.
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 system achieves accelerated convergence and enhanced coupling efficiency, improving signal quality and robustness under varying turbulence conditions.
Implementation Method 1
the sub-beams of the sub-apertures are focused by the coupling lens and form a focusing light spot on the rear focal plane
Implementation Method 2
converted into a corresponding electrical signal
Data Source
AI summary
The disclosure relates to the technical field of optical engineering, and in particular to a model-based adaptive multi-aperture optical fiber coupling control system and a model-based adaptive multi-aperture optical fiber coupling control method. The system includes an optical fiber coupler array, optical fibers, photoelectric detectors, a controller and a high-voltage amplifier, where a plurality of optical fibers and photoelectric detectors are arranged, the optical fiber coupler array consists of a plurality of optical fiber couplers, output ends of the optical fiber couplers are respectively connected with input ends of the photoelectric detectors through the optical fibers, output ends of the photoelectric detectors are respectively connected with input ends of the controller, output ends of the controller are respectively connected with input ends of the high-voltage amplifier, and output ends of the high-voltage amplifier are respectively connected with the optical fiber couplers.