Sensor-Based Optical Alignment for Free-Space Laser Backhaul
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Solution Overview
Problem
Conventional wireless communication systems face limitations in coverage area, signal attenuation, and data throughput with increasing distance from the signal broadcast device, and struggle to support a large number of IoT devices due to latency and signal noise issues, especially in indoor environments.
Innovation Solution
A communication system employing a sensor-based intelligent optical alignment for ultra-flexible and ultra-reliable laser beam-based wireless communication, combining photonics and RF communication with free-space optical backhaul, which performs multi-stage optical alignments and establishes a free-space optical link for high-speed data transmission, eliminating the need for intermediate RF routers and enhancing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Wi-Fi signals are used to extend wireless coverage, then connectivity range is increased, but signal attenuation and data throughput decrease with increasing distance
Solution Approach 1:
The patent introduces optical nodes as intermediary devices that relay data between wireless access points and end devices. These optical nodes convert RF signals to optical signals for transmission through free-space optical communication, then convert back to RF signals, thereby extending coverage while maintaining signal quality through the intermediary optical transmission medium.
Solution Approach 2:
The patent replaces traditional RF-based wireless communication with optical-based free-space optical communication for the backhaul link between access points and optical nodes. This substitution uses light instead of radio waves, providing higher bandwidth and less attenuation over distance, thus improving both coverage area and signal reliability.
2Reliability
If Ethernet cables are used to connect network devices, then reliable connectivity is achieved, but installation complexity and cost increase when redesigning network infrastructure
Solution Approach 1:
The patent replaces physical Ethernet cable connections with free-space optical communication links. Instead of running cables through walls and infrastructure, the system uses directed optical beams (laser communication) to transmit data wirelessly between optical nodes, achieving reliable connectivity without the installation complexity of cable-based systems.
Solution Approach 2:
The patent extracts the data transmission function from the physical cable medium and transfers it to optical wireless transmission. By removing the requirement for physical cable infrastructure, the system maintains reliable connectivity while eliminating the complexity of cable installation, routing, and physical connections.
3Quantity of substance
If conventional Wi-Fi systems are used to support multiple IoT devices, then device connectivity is provided, but latency and signal noise increase with the number of devices
Solution Approach 1:
The patent introduces optical nodes as intermediary relay points that establish dedicated optical communication paths between access points and groups of devices. This intermediary optical backhaul provides high-bandwidth, low-latency transmission that can handle multiple IoT devices simultaneously without the signal degradation and latency issues of conventional Wi-Fi systems.
Solution Approach 2:
The patent segments the network into multiple optical communication channels between access points and optical nodes. Each optical node can serve multiple devices, and the segmentation of traffic through different optical paths reduces contention and latency, allowing the system to support a large number of IoT devices while maintaining high reliability.
4Area of stationary object
If intermediate RF routers are deployed to extend coverage, then coverage area is increased, but device complexity and power requirements increase
Solution Approach 1:
The patent uses optical nodes as intermediaries that are simpler than traditional RF routers. These optical nodes primarily perform optical-to-RF and RF-to-optical signal conversion and relay functions, without the complex routing and processing requirements of conventional RF mesh networks, thereby extending coverage while reducing system complexity.
Solution Approach 2:
The optical nodes serve multiple functions: they act as relay points for optical communication, provide RF wireless access to end devices, and enable flexible network topology formation. This multi-functionality allows coverage extension without deploying multiple specialized devices, reducing overall system complexity compared to conventional RF router deployments.
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
This solution provides consistent high-throughput data connectivity across indoor areas with improved signal-to-noise ratio, near-zero latency, and the ability to support a massive number of IoT devices, while reducing the complexity and cost of network maintenance by eliminating the need for intermediate RF routers.
Implementation Method 1
directing a laser beam from a laser transmitter to a laser receiver
Implementation Method 2
free-space optical transmission medium
Implementation Method 3
sensor-based intelligent optical alignment
Data Source
AI summary
A communication system that includes a first optical node at a first location in a defined indoor area and a second optical node at a second location, where each of the first optical node and the second optical node comprises one or more first type of sensors. The first optical node establishes RF supervisory link with second optical node and performs a first optical alignment with the second optical node based on sensor measurements from the one or more first type of sensors. The sensor measurements are exchanged between the first optical node and the second optical node over the established RF supervisory link for the first optical alignment. The first optical node performs a second optical alignment with the second optical node and establishes a free-space optical link as a laser backhaul with the second optical node based on the first optical alignment and the second optical alignment.