研究目的
To create a low-cost analog stereo audio transmitting system using one optical fiber with sophisticated sound quality by utilizing the advantages of optical fibers over conventional wiring methods.
研究成果
The developed system is a simple and low-cost solution for transmitting high-quality stereo audio signals over long ranges using a single optical fiber. It offers advantages over conventional copper or coaxial-wired systems, including better signal-to-noise ratio and wider bandwidth. Future research will focus on implementing a digital audio system capable of transmitting more than 5 channels through one POF using WDM.
研究不足
The system is limited by the characteristics of plastic optical fibers, such as large optical loss and small-scale transmittance, compared to glass optical fibers. However, POF offers advantages like high flexure resistance, simple construction, and low production cost.
1：Experimental Design and Method Selection:
The system was designed to transmit analog stereo audio signals over a single plastic optical fiber using wavelength division multiplexing (WDM). The design includes a transmitter and receiver linked by POF, with optical filters to separate the audio signals.
2：Sample Selection and Data Sources:
The system uses a POF MH4001 with a diameter of 1 mm and length of 25m. Spectral characteristics of the optical filters and LEDs were recorded using a spectrometer.
3：5m. Spectral characteristics of the optical filters and LEDs were recorded using a spectrometer.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The transmitter includes a power supply, operational amplifier TL072, transistor BC547, and red and blue LEDs. The receiver includes a power supply, fiber optic coupler, optical filters, photodiodes BPW 34, transimpedance amplifiers, and non-inverting amplifiers.
4：Experimental Procedures and Operational Workflow:
The transmitter amplifies the input audio signal and converts it to light via LEDs. The light is transmitted through the POF to the receiver, where it is converted back to an electrical signal. Optical filters separate the signals for the left and right channels.
5：Data Analysis Methods:
The attenuation of the POF was measured using a replacement method. Spectral characteristics of the LEDs and optical filters were recorded to determine the best filters for signal separation.
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