We discuss the design of a digital laser communication receiver and its sensitivity test process. Laser communication is especially suitable for long-distance low-power micro–nano satellite links due to its narrow beam width, but the electro-optical noise situation of the micro–nano satellite platform is complicated and bad. Hence, it is necessary to introduce a digital laser communication receiver to flexibly suppress interference and noise to improve communication sensitivity. A digital laser communication receiver based on the avalanche photodiode (APD) is designed. Based on the principle of digital communication error probability, a high-sensitivity APD device is selected, and a digital receiving channel based on field programmable gate array is designed. The finite impulse response, the dynamic threshold, the baseband median, and other filtering algorithms are used to optimize the signal-to-noise ratio and enhance the detection sensitivity. At the same time, an 800-nm laser communication receiver sensitivity test experimental architecture is designed and the detection sensitivity experiment is carried out. The experiment indicates that the APD receiver achieves detection sensitivity at an Mbps rate better than −60 dBm. The digital filtering algorithm provides a filtering signal-to-noise ratio improvement of about 15 dB, which supplies a reference for the receiver design of micro–nano satellite laser communication.
KEYWORDS: Solar cells, Light emitting diodes, Light sources, Receivers, Solar energy, Telecommunications, Transmitters, Energy efficiency, Data transmission, Data modeling
Optical wireless transmission system using a solar cell can receive energy and information simultaneously with single link. Optical spectrum of transmitter is the one of factors in wireless energy and data hybrid transmission system, and optical spectrum effects should be researched. Firstly, the energy and data hybrid transmission system are designed and simulated based on lambert model and equivalent circuit of solar cell. Secondly, a hybrid transmission indoor experimental system is established using a monocrystalline silicon solar cell as a receiver. The frequency response of the solar cell is measured with different date rates and wavelengths. Additionally, the output signal’s amplitude and conversion efficiency of receiver with different wavelengths of transmitters (470nm and 850nm) are observed and measured in the process of energy transmission. What is more, 100 kHz output waveform of the receiver in the process of data transmission is researched and discussed in different intensities and wavelengths. The experimental results show that hybrid transmission of data and energy can be achieved in our indoor system. The energy transmission efficiency and amplitude of the receiver signal with 850 nm LED transmitter is better than those of 470 nm LED transmitter (2.1 times and 1.39 times, relatively) in energy transmission process. Compared to the performance using a 470 nm light source in data transmission process, the waveform contrast of 850nm light source band is better.
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