Design And Theoretical Research On Multi-spectral Optical Antenna For Light Wireless Communication

In recent years, the visible light communication(VLC) have attracted much attentionand being widely researched for its some advantages, such as high transmitting power, noelectromagnetic radiation, less interference and less energy. At present, the research ofVLC, both in China and abroad, mostly focuses on electronic processing, while the study ofoptical receiving and transmitting systems is relatively weak. The development of opticalreceiving and transmitting systems need more attention. Researchers found that opticalreceiving and transmitting systems can limit the communication performance of the wholesystem, for example, traditional optical receiving system can seriously impact on thecommunication capability because of small field of view(FOV) and less light gathering.In order to improve the VLC system performance, this thesis puts forward the conceptof multi-spectral light wireless communication. Compared with traditional VLC system, itreplaces white LEDs with multi-spectral LEDs. By mixing the colorful light, white light isgot to transmit. Multi-spectral receiving system realizes high signal speed in multi-channeltransmitting by using dispersion spectrometer system and APD array. Thesis mainly studiesforward optical receiving antenna to meet the requirements of multi-spectral light wirelesscommunication. Base on the analysis of traditional VLC receiving technology, thesisdesigns two types to satisfy the demands of wide FOV and focusing on tiny receivingsurface. One type is transmission method while the other is refraction-reflection method.The transmission type combines with inverse distance design and develops onetransmission forward optical receiving antenna by using ZEMAX optimization simulation.Its FOV is90°×22°and gain of light concentration is28. The refraction-reflection typecombines with whole cloud detection and develops one refraction-reflection forward opticalreceiving antenna by simplifying the surface and calculating the curvature radius. Its halfFOV is5~30°and obscuration ratio is33%, as well as its gain of light concentration being263. Moreover, thesis also makes some exploration about the evaluation method of opticalreceiving antenna.Finally, thesis combines the two types of forward optical receiving antenna withWDM system to constitute the multi-spectral light optical receiving system. Then thesismakes some simulation to verify the reasonability and feasibility.