Polarized Optical Wireless Links for Multi-Source Interference Control
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Solution Overview
Problem
Optical wireless communication systems experience interference between optical signals when multiple light sources of the same type are installed close to each other, leading to deteriorated transmission characteristics.
Innovation Solution
Implementing a communication system with polarizing filters that adjust their direction to align or differ based on signal intensity measurements, ensuring that optical signals from multiple light sources do not interfere with each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light sources of the same type are installed close to each other to increase coverage, then the coverage area is improved, but interference between optical signals occurs and transmission characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the polarization state of optical signals. Each light source transmits optical signals with different polarization directions (e.g., vertical, horizontal, diagonal), which allows multiple light sources to operate simultaneously without interference while maintaining reliable transmission characteristics across extended coverage areas
Solution Approach 2:
The patent uses polarization filters as intermediaries to manage interference between optical signals from multiple light sources. These filters selectively transmit or block signals based on their polarization direction, enabling the system to maintain reliable transmission by filtering out interfering signals from adjacent light sources
2Area of stationary object
If multiple light sources are installed close to each other to improve coverage, then the coverage area is improved, but signal interference increases
Solution Approach 1:
The patent changes the polarization parameter of optical signals to differentiate between signals from different light sources. By assigning distinct polarization states (vertical, horizontal, diagonal) to signals from different sources, the system eliminates harmful interference while expanding coverage area
Solution Approach 2:
The patent converts the potentially harmful interference from multiple light sources into a beneficial feature by using polarization multiplexing. The interference is transformed into distinguishable signal channels that can be simultaneously transmitted and received without conflict, thereby enabling extended coverage
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
Prevents interference between optical signals, maintaining transmission quality by aligning or differing the polarizing filter directions, thus enabling effective optical wireless communication without signal degradation.
Implementation Method 1
a first polarizing filter, and a second polarizing filter. Two communication links are formed through combinations of the first polarizing filter and the second polarizing filter
Data Source
AI summary
In an optical wireless communication system including a first optical wireless communication device and a second optical wireless communication device, the first optical wireless communication device includes a transmission unit that transmits an optical signal to the second optical wireless communication device via a first polarizing filter, and the second optical wireless communication device includes a reception unit that receives the optical signal via a second polarizing filter, a measurement unit that measures a signal intensity of the optical signal, and a control unit that changes a direction of the second polarizing filter or the first polarizing filter to cause the signal intensity to be higher.