MEMS Intelligent Surface Beam Steering for Obstacle-Limited FSO Links
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Solution Overview
Problem
Traditional Free Space Optical (FSO) communication networks require numerous nodes and infrastructure, making them costly and impractical for large-scale deployment due to high path-loss and eye-safety power limitations, necessitating a more efficient and scalable solution.
Innovation Solution
Implementing Reconfigurable Intelligent Surface Free Space Optical (RIFSO) devices that can be deployed in conformal arrangements on various surfaces, allowing for strategic beam steering and path diversification to overcome obstacles and reduce dispersion, eliminating the need for wired power sources and fiber connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional Free Space Optical (FSO) devices are used for transmission, then signal transmission can be achieved, but high path-loss characteristics and eye-safety power limitations result in inability to cover large areas and need for numerous nodes
Solution Approach 1:
The patent introduces Reconfigurable Intelligent Surface (RIS) elements as intermediary components between the optical transmitter and receiver. These RIS elements reflect and steer optical signals around obstacles and extend coverage areas without requiring additional high-power transmitters, thereby addressing the path-loss limitation while expanding coverage area.
Solution Approach 2:
The patent utilizes three-dimensional spatial positioning and steering of optical beams through multiple RIS elements arranged at different locations and orientations. By adding spatial dimensionality to signal propagation paths, the system extends coverage area beyond the line-of-sight limitations of traditional FSO devices.
2Area of stationary object
If traditional FSO devices are deployed to cover large areas, then more nodes are required, but this increases infrastructure cost and operational expenses
Solution Approach 1:
The RIS elements serve multiple functions: they reflect optical signals, steer beams in different directions, extend coverage area, and eliminate the need for additional transmitter nodes. This multi-functionality reduces the number of required nodes while maintaining large area coverage, thereby reducing infrastructure and operational costs.
3Speed
If RF signals are transmitted through medium, then direct transmission from transmitter to receiver is achieved, but the medium blocks or attenuates the signal
Solution Approach 1:
The RIS elements act as intermediary reflectors that receive optical signals from the transmitter and redirect them to the receiver, bypassing obstacles in the direct path. This indirect path through RIS elements maintains signal strength by avoiding attenuation from obstructing media while preserving transmission speed.
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
RIFSO devices enable directed RF signals with reduced power consumption and increased reliability, allowing for efficient coverage of larger areas with fewer nodes, thereby reducing capital outlays and operational expenses.
Implementation Method 1
A RIS may reflect an incident RF beam in one or more directions, depending on the settings of constituent elements of the RIS
Data Source
AI summary
A device may include a first plurality of microelectromechanical system (MEMS) elements. Each of the MEMS elements may include a mirror configured to reflect a radio frequency (RF) signal propagating through a free space to the mirror and whose surface orientation is configurable based on signals from a controller. The device may also include the controller. The controller may be configured to: receive a configuration message from a cellular network component over a radio frequency (RF) control channel; extract configuration parameter values for one or more of the MEMS elements; and configure the one or more of the MEMS elements by sending control signals corresponding to the configuration parameter values.