0.14 THz超高速无线通信系统实验研究

介绍了0.14 THz超高速无线通信实验系统的主要组成部分和主要实验结果。从太赫兹电子学出发，基于太赫兹半导体器件和宽带数字调制解调技术，采用一种“低频段高速矢量调制＋谐波混频＋放大”的太赫兹高速信息传输技术路线，在国内首次成功实现了0.14 THz 0.5 km 10 Gb/s高速信号实时传输和软件化事后解调，同时进行了4路高清视频信号的传输与解调。

Abstract

Using the pixellated CdZnTe detector, the radiation imaging experiment for the Rh target X-ray source was accomplished. The experimental results indicate that the response signals of the anode pixels, which distribute over the center irradiated area, are completely shut-off when the tube voltage is 45 kV and the tube current increases to 20 μA. Moreover, the non-response pixel area expands with the increase of the tube current, and the total event count of the CdZnTe detector reduces obviously. Furthermore, the inner electric potential and electric field distributions of the pixellated CdZnTe detector were simulated based on the Poisson equation. The simulation results reveal that the accumulation of the hole carriers, which results from the extremely low drift ability of the hole carrier, leads to a relatively high space-charge-density area in the CdZnTe bulk when the irradiated photon flux increases to 5×105 mm-2·s-1. And thus, the induced signal screen effect of the anode pixels in the center irradiated area is mainly attributed to the distorted electric field which makes electron carriers drift toward the high potential area in the CdZnTe crystal instead of the pixel anodes.

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邓贤进, 王成, 林长星, 陈琦, 周传明, 张健, 刘仓理, 姚军, 肖仕伟, 苏伟, 刘杰, 吴尚昀, 黄庆钟, 张茜梅, 颜军, 肖勇. 0.14 THz超高速无线通信系统实验研究[J]. 强激光与粒子束, 2011, 23(6): 1430. 邓贤进, 王成, 林长星, 陈琦, 周传明, 张健, 刘仓理, 姚军, 肖仕伟, 苏伟, 刘杰, 吴尚昀, 黄庆钟, 张茜梅, 颜军, 肖勇. Accumulated-carrier screening effect based investigation for pixellated CdZnTe radiation detector[J]. High Power Laser and Particle Beams, 2011, 23(6): 1430.

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