激光通信中光学天线的隔离度研究

Study on the Isolation of Optical Antennas in Laser Communicati

伴随激光通信组网和轻量化的需求以及收发一体化模式的普遍应用,实现光学天线发射和接收之间的高效隔离至关重要,为此文章对同轴天线与离轴天线的隔离度进行了研究。首先采用Code V光学设计软件分别设计了1550 nm波段的同轴天线和离轴两反式天线,视场角为±1.5 mrad,接近衍射极限;再根据杂散光散射模型,利用分析软件进行光线追迹,模拟出隔离度;然后分别研究了在同轴天线次镜中心放置遮拦来规避开孔风险,以及在离轴天线中调整离轴量和曲率半径的方法,使同轴和离轴天线的隔离度分别提升至−69 dB和−89 dB。结果表明,上述方法均能够有效提升光学天线的隔离度。

Accompanying the demands for laser communication network integration,lightweighting,and the widespread adoption of transceiver integration,achieving efficient isolation between optical antenna transmission and reception is crucial.This article thus investigates the isolation between coaxial and off-axis antennas.Initially,using Code V optical design software,coaxial antennas and off-axis two-reflective antennas operating in the 1550 nm band were individually designed with a field of view angle of±1.5 mrad,approaching the diffraction limit.Subsequently,based on the stray light scattering model,ray tracing was conducted using analysis software to simulate isolation.Methods were then studied to place baffles at the center of coaxial antenna secondary mirrors to mitigate aperture risk,and to adjust off-axis tilt and curvature radii in off-axis antennas.Ultimately,the isolation levels of coaxial and off-axis antennas were respectively increased to−69 dB and−89 dB.The results indicate that the aforementioned methods effectively enhance the isolation of optical antennas.