Chinese Optics Letters, 2014, 12 (12): 120401, Published Online: Dec. 4, 2014
Detection of a directly modulated terahertz light with quantum-well photodetector Download: 651次
140.5965 Semiconductor lasers, quantum cascade 040.2235 Far infrared or terahertz 060.2605 Free-space optical communication
Abstract
We demonstrate a wireless transmission link at 3.9 THz over a distance of 0.5 m by employing a terahertz (Hz) quantum-cascade laser (QCL) and a THz quantum-well photodetector (QWP). We make direct voltage modulation of the THz QCL and use a spectral-matched THz QWP to detect the modulated THz light from the laser. The small signal model and a direct voltage modulation scheme of the laser are presented. A square wave up to 30 MHz is added to the laser and detected by the THz detector. The bandwidth limit of the wireless link is also discussed.
Qingzhao Wu, Li Gu, Zhiyong Tan, Chang Wang, Juncheng Cao. Detection of a directly modulated terahertz light with quantum-well photodetector[J]. Chinese Optics Letters, 2014, 12(12): 120401.