Broadband THz Pulse Transmission Through the Atmosphere

被引:68
|
作者
Yang, Yihong [1 ]
Mandehgar, Mahboubeh [1 ]
Grischkowsky, Daniel R. [1 ]
机构
[1] Oklahoma State Univ, Sch Elect & Comp Engn, Stillwater, OK 74078 USA
基金
美国国家科学基金会;
关键词
Absorption; atmospheric transmission; spectroscopy; Terahertz communication; Terahertz; TIME-DOMAIN SPECTROSCOPY; ABSORPTION; H2O; CO2;
D O I
10.1109/TTHZ.2011.2159554
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We have transmitted a low-power beam of repetitive broadband THz pulses the record distance of 167 m through the atmosphere with 51% relative humidity at 21 degrees C and have observed the broadened transmitted pulses with a signal to noise ratio greater than 200. The measured transmitted pulses reshaped from a 0.5-ps input pulse into an output pulse structure with a 5-ps symmetric pulse at the leading edge followed by a frequency-swept, rapidly oscillating trailing edge extending with increasing frequency to beyond 150 ps. The leading pulse appearing in the output pulse structure is composed of phase-locked frequency components extending from 0.07 to 0.37 THz that experienced negligible attenuation and group velocity dispersion due to transmission through water vapor. Such a stable pulse shape is suitable for the THz bit in a digital THz communications channel. Our results demonstrate a bit rate-distance product of greater than 8 (Gb/s)-km, which is comparable to an optical fiber digital communications channel.
引用
收藏
页码:264 / 273
页数:10
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