研究目的
Investigating the implementation of Wavelength Division Multiplexing (WDM) in visible light communication using RGB LED as a frequency selective receiver.
研究成果
Wavelength division multiplexing in visible light is achieved by using RGB LED itself as a receiver, without the use of optical filters. A very simple design for a visible light communication system can be developed as this system can be easily converted to a half-duplex system, in which there is no need of a separate receiver with optical filters, the transmitter itself can act as a receiver.
研究不足
The system performs satisfactorily in kilohertz range, but the error rate increases significantly in megahertz range due to hardware limitation. The sensitivity of LED as a receiver is lesser as compared to conventional photodetectors, which reduces the range of operation for a fixed input power. Also, this system requires very high power compared to RF based systems.
1：Experimental Design and Method Selection:
The system utilizes RGB LED as a frequency selective receiver based on semiconductor theory.
2：Sample Selection and Data Sources:
The system is implemented with RGB LEDs for both transmission and reception.
3：List of Experimental Equipment and Materials:
RGB LEDs, MOSFET based shunt driver circuit, Digital Signal Oscilloscope (DSO), loupe lens.
4：Experimental Procedures and Operational Workflow:
The transmitter is implemented on a MOSFET based shunt driver circuit, and the receiver is a simple RGB LED with its anode given to the positive of DSO or ADC of microcontroller.
5：Data Analysis Methods:
The voltage waveform is plotted on the DSO, and in microcontroller-based implementation, the software collects the data from ADC, compares it with a predefined threshold, converts it into binary data, complements it, and regenerates the original binary data transmitted.
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