Visible Light Communication Polarization Multiplexing
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Solution Overview
Problem
Current visible light communication systems face limitations in bandwidth and transmission capacity due to interference between orthogonal polarized light signals from different sources, which affects the reliability and efficiency of data transmission.
Innovation Solution
The system employs multiple transmitting and receiving modules with orthogonal polarization plates to modulate and demodulate optical signals, allowing for independent transmission and reception of signals from different light sources, thereby increasing transmission capacity without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple visible light sources are used to increase transmission capacity, then the bandwidth and data throughput are improved, but interference between orthogonal polarized light signals occurs which deteriorates transmission reliability
Solution Approach 1:
The patent divides the transmission system into multiple independent transmitting modules, each handling a specific polarization state (horizontal or vertical). By segmenting the signal transmission paths and assigning dedicated polarization states to each module, the system avoids interference between signals from different light sources while maintaining high transmission capacity through parallel operation of multiple modules.
2Reliability
If orthogonal polarization plates are used to modulate signals from different light sources, then signal independence is improved, but the device complexity increases due to multiple transmitting and receiving modules
Solution Approach 1:
The patent employs polarization plates that serve dual functions: they modulate outgoing optical signals from visible light sources and simultaneously demodulate incoming optical signals at the receiving end. This multi-functionality reduces the need for separate modulation and demodulation components, thereby managing system complexity while maintaining signal independence across multiple transmission channels.
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 approach effectively doubles or triples the transmission capacity of visible light communication systems by ensuring that signals from different light sources do not interfere with each other, resulting in improved bit error rates and increased data throughput.
Implementation Method 1
a first transmitting polarization plate for modulating the first optical signals to generate a plurality of first modulated optical signals... a second transmitting polarization plate for modulating the second optical signals to generate a plurality of second modulated optical signals. A polarization of the first transmitting polarization plate is orthogonal to a polarization of the second transmitting polarization plate.
Implementation Method 2
a first receiving polarization plate for demodulating a plurality of first modulated optical signals to generate the first demodulated optical signals... a second receiving polarization plate for demodulating a plurality of second modulated optical signals to generate the second demodulated optical signals
Implementation Method 3
a plurality of first photodiodes for receiving a plurality of first demodulated optical signals... a plurality of second photodiodes for receiving a plurality of second demodulated optical signals
Data Source
AI summary
A transmitting apparatus and a receiving apparatus for visible light communication, and a visible light communication system are provided. The visible light communication system includes a transmitting apparatus and a receiving apparatus. The transmitting apparatus includes two transmitting modules. The transmitting modules include a plurality of visible light sources and a transmitting polarization plate. Polarizations of the two transmitting polarization plates are orthogonal to each other. The receiving apparatus includes two receiving modules. The receiving modules include a plurality of light detecting diodes and a receiving polarization plate. Polarizations of the paired receiving polarization plate and transmitting polarization plate are the same.