基于THz QCL 和THz QWP 的数字通信演示系统

随着无线通信速率需求的增加和材料生长、器件工艺制作水平的提高，太赫兹（THz）通信已成为未来高速无线通信系统发展的一个重要方向。介绍了太赫兹通信的特点以及国际上太赫兹通信系统的发展现状，并报导了一种利用太赫兹量子级联激光器（THz QCL）作为发射源，太赫兹量子阱探测器（THz QWP）作为接收器的太赫兹数字通信演示系统。该系统采用On-Off-Key（OOK）调制和直接强度检测方式，通信频点为3.9 THz，通信距离为2.2 m，传输速率可达1 Mbps 以上。最后探讨了该系统的带宽限制因素及其在通信速率方面的潜力。

Digital communication link based on THz QCL and THz QWP

Terahertz (THz) technology has attracted a great deal of interest for its unique features and potential applications in many areas. Along with the increasing demand of high bit rate for wireless data transmission and the improvement of material growth and device fabrication, THz communication has become one of the most important fields in the development of future high speed wireless communication systems. The characteristics and the state of the art in THz wireless communication were introduced in this paper. A digital communication link based on terahertz quantum cascade laser (THz QCL) and terahertz quantum well photodetector (THz QWP) was demonstrated. Using direct On-Off-Key (OOK) modulation and direct detection, a pseudorandom non-return-to-zero (NRZ) signal with a bit rate of 1 Mbps was transmitted through the link. The carrier frequency was 3.9 THz, and the link distance was 2.2 m. The limitation and potentiality of the transmission speed for such a system was discussed.