Terahertz(T Hz)band locates between the infrared and microwave and has great appli-cation prospects in the fields of national defense such as space communications,short-range tacti-cal communications,and so on.The characteristics,categories,solutions and the key technologies involved in terahertz communication system are summarized.Research status and achievements of terahertz communication system at home and abroad in recent years are introduced,and the communication distance reaches 20 km at 0.14 T Hz band,the communication transmission rate reaches 105 Gb/s at 0.3 T Hz band.Several communication technical routes are analyzed,that conclude all electronics method,optoelectronics method and quantum cascade laser communica-tion method,and their advantages and disadvantages are compared.Additional,the development trend and application prospect of terahertz communication technology are viewed.%太赫兹波段位于红外和微波之间,在空间通信、近程战术通信等国防领域有巨大的应用前景.总结了太赫兹通信技术的特点、类别、方案及太赫兹波通信系统涉及的关键技术.介绍了近几年国内外太赫兹通信技术研究现状及取得的成果,在0.14 T Hz频段通信距离达到20 km,0.3 T Hz处通信传输速率高达105 Gb/s.分析了全电子学方法、光电子方法、量子级联激光通信等几种通信技术路线,并比较了各系统的优缺点.展望了太赫兹通信技术的发展趋势和应用前景.
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