Su Ke, Moeller Lothar, Barat Robert B, Federici John F
Department of Physics, New Jersey Institute of Technology, 322 King Blvd., Newark, New Jersey 07102, USA.
J Opt Soc Am A Opt Image Sci Vis. 2012 Nov 1;29(11):2360-6. doi: 10.1364/JOSAA.29.002360.
In order to study and compare propagation features of terahertz (THz) links with infrared (IR) links under different weather conditions such as turbulence, fog, and dust particles, THz and IR free space communication links at 625 GHz carrier frequency and 1.5 μm wavelength, respectively, with a maximum data rate of 2.5 Gb/s have been developed. After propagating through the same channel perturbation caused by dust, attenuation of the carrier frequencies by dust as well as scintillation effects on both channels are analyzed by measuring the power attenuation and bit error rates. Attenuation by the presence of dust degrades the IR channel but exhibits almost no measurable impact on the THz signal. Numerical simulations of THz attenuation with different dust concentrations are presented and agree with the measured results.
为了研究和比较太赫兹（THz）链路与红外（IR）链路在湍流、雾和尘埃颗粒等不同天气条件下的传播特性，分别开发了载波频率为625 GHz、波长为1.5 μm、最大数据速率为2.5 Gb/s的太赫兹和红外自由空间通信链路。在通过由尘埃引起的相同信道扰动进行传播后，通过测量功率衰减和误码率，分析了尘埃对载波频率的衰减以及两个信道上的闪烁效应。尘埃的存在导致的衰减会使红外信道性能下降，但对太赫兹信号几乎没有可测量的影响。给出了不同尘埃浓度下太赫兹衰减的数值模拟结果，且与测量结果相符。
