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针对多光谱通信的需求,设计了一种光栅型光谱波分复用可见光通信光学天线。相比同类多光谱通信光学系统,该光学天线具有信道数多、增益大、效率高等优点。经过理论分析,提出了采用双柱面镜结合反射式光栅的天线结构,在光谱维保持较高的光谱分辨率,增加信道数,提高系统的通信速率;同时缩小光斑空间维的大小,提高系统的增益。仿真分析表明,该光学天线可以同时高效地对8个不同的单光谱信号进行探测接收,视场角高达18°×0.4°,增益为12.6,信噪比高达48.28 d B,天线尺寸为9 cm×12 cm。最后,根据设计仿真制作了原理样机,实验结果显示该光学天线可以清晰地分开多光谱信号并实现探测接收,信号间没有产生串扰,信噪比较高,适用于多光谱波分复用通信系统。
Aiming at the demand of multi-spectral communication, a grating optical wavelength division multiplexing optical communication optical antenna is designed. Compared with similar multi-spectral communication optical system, this optical antenna has the advantages of many channels, high gain and high efficiency. After theoretical analysis, the antenna structure using double-cylinder mirror combined with reflective grating is proposed, which maintains high spectral resolution, increases the number of channels and increases the communication speed of the system. At the same time, it reduces the size of spot space dimension and improves the system Gain. The simulation results show that the optical antenna can effectively detect and receive eight different single-spectrum signals at the same time with a field angle of 18 ° × 0.4 °, a gain of 12.6, a signal-to-noise ratio of 48.28 d B and an antenna size of 9 cm × 12 cm. Finally, the prototype is designed according to the design simulation. The experimental results show that the optical antenna can clearly separate the multi-spectrum signals and detect the receiving signals without crosstalk and high signal-to-noise ratio. It is suitable for multi-spectral wavelength division multiplexing communication system .