Abstract
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.
© 2013 Chinese Optics Letters
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