基于光纤传输的太赫兹无线通信

针对500GHz以上的大气窗口频段,提出了一种基于光纤传输的THz通信系统。该通信系统的微波源由两个工作频率不同的激光器通过光混频器获得。接收机采取肖特基整流二极管进行直接接收。此外,分析了该THz通信系统中的关键器件设计及THz通信中的关键问题。在硬件设计的基础上,讨论了信号调制方式对系统通信容量、传输距离和误码率的影响。

量子级联激光器技术内涵及其应用前景

20年来,QCL已经取得了飞速发展,在中波红外对抗、痕量气体检测、THz通信等领域初步得到了应用。本文从有源区方案设计及其优化、安装与封装、光子晶体QCL等设计技术,简要概述了量子级联激光器技术内涵;简要分析了当前QCL激光器研究热点和发展现状;最后从中波红外对抗、痕量气体检测、THz通信等应用技术方面,对QCL的技术应用前景进行了简要分析。

基于Simulink的太赫兹调制技术仿真研究

太赫兹(THz)波段通信是近年来才受到关注的,对于太赫兹波通信而言,如何将信息编码到太赫兹载波是太赫兹通信技术面临的首要问题,因此合适的THz波调制方法对THz通信系统起着至关重要的作用。本文利用Matlab的Simulink工具箱,分别在16QAM和QPSK调制技术下建立了THz通信系统仿真模型,传输的信号速率为10Gbps,发射功率0d Bm,通信频段在280GHz-296GHz,带宽约为20GHz,最后得到了系统仿真图。并对16QAM和QPSK的THz通信系统调制性能进行了分析。

Attenuation of terahertz transmission through rain

Based on the Marshall-Palmer,Weibull raindrop size distribution and Mie electromagnetic scattering model,the relationships of attenuation coefficient of terahertz(THz) atmospheric window waves with precipitation rate and temperature are studied.Furthermore,combined with the loss of electromagnetic wave transmission in free space,the attenuation of THz communication and the transmission of current mobile communication signals through rain are compared and analyzed.The results show that the attenuation coefficient of THz transmission is increased with increasing precipitation rate,the difference of attenuation coefficient at different THz window waves is small,and the maximum difference is about 3 dB.The rain attenuation of THz wave is first decreased and then increased with increasing temperature,but the temperature has little effect on it.The attenuation of THz wave through rain is much larger than that of mobile communication signal.