Multi-Element Full-Duplex FSO Transceiver for Vibration Stability
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Solution Overview
Problem
Existing multi-element laser-based full-duplex free-space optical (FSO) transceivers face challenges in maintaining direct line-of-sight (LOS) communication due to vibrations, sway, and tilt, leading to alignment issues and reduced signal-to-interference-plus-noise ratio (SINR) in mobile platforms.
Innovation Solution
A multi-element FSO transceiver design with optimally positioned transmitters and receivers on a transceiver plane, combined with an adjustable defocal lens assembly, to maximize optical coupling efficiency and vibration tolerance, ensuring maximum SINR and minimizing the effects of atmospheric turbulence and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multi-element laser-based FSO transceiver is used for mobile communication, then communication speed and bandwidth are improved, but alignment stability deteriorates due to vibration and mobility
Solution Approach 1:
The transceiver is divided into multiple independent laser elements arranged in an array, with each laser operating independently. This segmentation allows the system to maintain communication through multiple simultaneous beams, reducing the impact of alignment instability on overall communication performance.
Solution Approach 2:
The patent employs adaptive beam steering and dynamic adjustment of laser parameters to compensate for mobility and vibration. The system changes operational parameters in real-time to maintain optimal alignment and communication quality despite platform movement.
2Productivity
If full-duplex operation is implemented to increase network capacity, then channel capacity is improved, but self-interference increases
Solution Approach 1:
The transceiver separates transmission and reception functions into spatially distinct laser elements. Transmitters are positioned in specific locations while receivers are positioned in other locations, allowing simultaneous full-duplex operation with reduced self-interference through spatial separation.
Solution Approach 2:
The patent introduces optical isolators and wavelength division multiplexing as intermediary mechanisms to manage self-interference. These components act as mediators between the transmitter and receiver, blocking harmful feedback signals while allowing useful communication signals to pass.
3Reliability
If direct line-of-sight propagation is used for FSO communication, then communication security is improved, but communication range is limited by atmospheric conditions
Solution Approach 1:
The laser array divides the communication path into multiple parallel beams, increasing the probability that at least some beams can maintain line-of-sight propagation through atmospheric conditions. This segmentation provides redundancy and extends effective communication range despite atmospheric turbulence or obstruction.
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 design achieves improved communication throughput and increased network capacity by optimizing transmitter and receiver placement, enhancing SINR and reducing the impact of environmental perturbations, particularly suitable for mobile applications like low-flying drones.
Implementation Method 1
free-space optical (FSO) transceiver
Implementation Method 2
Multi-element laser-based full-duplex free-space optical transceiver
Implementation Method 3
defocal lens assembly
Implementation Method 4
maximize the optical coupling efficiency
Data Source
AI summary
A method for performing in-band full-duplex (IBFD) free-space optical (FSO) communication to ensure maximum signal-to-interference and noise ratio (SINR) and to minimize the effects of vibration of the mobile platform and atmospheric turbulence. Positioning a defocal lens assembly having an adjustable distance between the transmitters and the lens assembly to maximize the optical coupling efficiency and the vibration tolerance by adjusting the defocusing length.