Few-Mode Fiber Coupling Control for Optical Space Communication
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Solution Overview
Problem
In free-space optical communication systems, precise tracking control of the coupling optical system is required to couple a received optical beam to an optical fiber, but existing methods result in signal loss and increased costs.
Innovation Solution
A free-space optical communication system with a fiber having multiple propagation modes and a coupling optical system that adjusts based on the sum of coupling intensities to all modes, using a mode separator to separate light and prioritize control based on coupling intensity ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling optical system is used to couple the received optical beam to the optical fiber, then the optical signal can be received, but signal loss occurs and costs increase due to the need for precise tracking control
Solution Approach 1:
The invention segments the optical signal reception into multiple independent paths by using a few-mode fiber with multiple propagation modes. Each mode can be independently controlled and optimized, allowing the system to divide the coupling task into multiple simpler sub-tasks that are easier to control precisely, thereby reducing overall signal loss
Solution Approach 2:
The invention implements dynamic control of the coupling optical system by adjusting the priority of control based on real-time coupling intensity ratios of different modes. This dynamic adaptation allows the system to optimize coupling efficiency under varying conditions, minimizing signal loss while maintaining reliable reception
2Manufacturing precision
If precise tracking control is implemented to couple the optical beam to the fiber, then coupling accuracy improves, but device complexity and cost increase
Solution Approach 1:
The few-mode fiber serves multiple functions simultaneously: it acts as both the transmission medium and the control element for tracking. By utilizing the inherent spatial characteristics of different propagation modes, the system achieves precise coupling control without requiring separate complex tracking devices, thus improving coupling accuracy while limiting complexity increase
Solution Approach 2:
The system uses the coupling intensity ratios from the multiple modes themselves to generate control signals for optimizing coupling. The optical signal provides its own feedback information through the differential coupling characteristics of different modes, eliminating the need for external complex sensing and control systems
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
Enables high-speed and accurate tracking control of the optical beam without causing significant signal loss when coupling to an optical fiber, optimizing the coupling process.
Implementation Method 1
a coupling optical system for coupling a received optical beam to the fiber
Implementation Method 2
a mode separator for separating light coupled to the plurality of propagation modes
Data Source
AI summary
Tracking control of a light beam is achieved at high speed and with good precision, without requiring preparation of an optical system that causes high signal loss when coupling a reception light beam with an optical fiber. A reception device for optical space communication comprises: fibers having a plurality of propagation modes with spatially different characteristics; an optical coupling system for coupling the reception light beam to the fibers; and a mode separator that separates the coupled light into a plurality of propagation modes, the adjustment axes of the optical coupling system for coupling the reception light beam to one end of the fibers being controlled on the basis of the total coupling strength to all of the modes, and the priority of control of the axes being adjusted on the basis of information about the coupling strength ratio for each mode.