摘要
A 2.4-m communication link operating at 3.9 THz based on a terahertz quantum cascade laser and a terahertz quantum well photodetector （THz QWP） are introduced. The lumped electrical models of THz QWP for small signals are presented. A discussion of the bandwidth limit of the detecting circuit is presented. Using direct on off-keying modulation and intensity detection, the transmission of digital video signal with a data rate of 2.5 Mb/s is demonstrated. Pseudo-random binary sequences are transmitted to investigate the bit-error rate （BER） at different rates. Result shows the error free transmission when the rate is below 5 Mb/s.
A 2.4-m communication link operating at 3.9 THz based on a terahertz quantum cascade laser and a terahertz quantum well photodetector （THz QWP） are introduced. The lumped electrical models of THz QWP for small signals are presented. A discussion of the bandwidth limit of the detecting circuit is presented. Using direct on off-keying modulation and intensity detection, the transmission of digital video signal with a data rate of 2.5 Mb/s is demonstrated. Pseudo-random binary sequences are transmitted to investigate the bit-error rate （BER） at different rates. Result shows the error free transmission when the rate is below 5 Mb/s.
基金
supported by the National"863"Pro-gram of China(No.2011AA010205)
the National Natural Science Foundation of China(Nos.61131006,6117 6086,and 61204135)
the Major National Development Project of Scientific Instrument and Equipment(No.2011YQ150021)
the Important National Science and Technology Specific Projects(No.2011ZX02707)
the Major Project(No.YYYJ-1123-1)
the International Collaboration and Innovation Program on High Mobility Materials Engineering of Chinese Academy of Sciences,and the Shanghai Municipal Commission of Sci-ence and Technology(Nos.10JC1417000,11ZR1444000,and 11ZR1444200)
