Grating optical antenna for spectral wavelength division multiplex visible light communication

Based on the requirement of the wavelength division multiplex communication, an optical antenna is designed. Compared with the similar spectral communication system, the antenna has the advantages of large number of channels, large optical gain, high efficiency, etc. After theoretical analysis, the structure of double cylinder mirror with reflecting grating is proposed, which can not only maintain high spectral resolution at spectral dimension and improve the system's communication rate, but also decrease the spot size at spatial dimension and increase the optical gain of the system. The simulation results show that the antenna can receive eight kinds of different single spectrum signals efficiently. The field of view reaches 18°×0.4°, the optical gain is 12.6, the optical signal-to-noise ratio achieves 48.28 dB and the size of the optical antenna is 9 cm× 12 cm. At last, a prototype based on the design is produced, and the experiments show that the antenna can receive the multi-spectrum signal efficiently and the signal noise rate(SNR) is high enough for wavelength division multiplexing (WDM) optical communication.