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卡塞格伦结构简单,安装方便,但次镜的盲区使天线的发射效率降低。基于此,设计了一种基于卡塞格伦望远镜的收发一体光学天线,充分利用卡塞格伦天线有效区域(盲区以外的部分)作为发射。通过4个自聚焦透镜胶合光纤结构的端面环形离轴发射代替激光器高斯沿轴发射,可有效规避次镜盲区的影响;用大芯径塑料光纤接收信号,不但耦合效率高,且便于发射-接收对准。实际测试结果表明:该天线系统易于对准,发射损耗低,满足一般无线光通信系统的要求,最终实现收发一体。
Cassegrain has the advantages of simple structure and convenient installation, but the blind spot of the secondary mirror reduces the transmitting efficiency of the antenna. Based on this, a kind of optical transceiver based on Cassegrain telescope is designed, which makes full use of the effective area of Cassegrain antenna (the part outside the blind area) as the transmitting. By four self-focusing lens cemented fiber structure of the end face ring off axis instead of laser Gaussian axis emission, which can effectively avoid the secondary mirror blind zone; with large core plastic optical fiber signal received, not only the coupling efficiency, and easy to launch - receive alignment. The actual test results show that: The antenna system is easy to align, low transmission loss, to meet the requirements of the general wireless optical communication system, and ultimately achieve the transceiver.