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Jia, Shi; Lo, Mu-Chieh; Zhang, Lu; Ozolins, Oskars; Udalcovs, Aleksejs; Kong, Deming; Pang, Xiaodan; Guzman, Robinson; Yu, Xianbin; Xiao, Shilin; Popov, Sergei; Chen, Jiajia; Carpintero, Guillermo; Morioka, Toshio; Hu, Hao; Oxenløwe, Leif K
Nature communications, 03/2022, Volume: 13, Issue: 1Journal Article
Photonic generation of Terahertz (THz) carriers displays high potential for THz communications with a large tunable range and high modulation bandwidth. While many photonics-based THz generations have recently been demonstrated with discrete bulky components, their practical applications are significantly hindered by the large footprint and high energy consumption. Herein, we present an injection-locked heterodyne source based on generic foundry-fabricated photonic integrated circuits (PIC) attached to a uni-traveling carrier photodiode generating high-purity THz carriers. The generated THz carrier is tunable within the range of 0-1.4 THz, determined by the wavelength spacing between the two monolithically integrated distributed feedback (DFB) lasers. This scheme generates and transmits a 131 Gbits net rate signal over a 10.7-m distance with -24 dBm emitted power at 0.4 THz. This monolithic dual-DFB PIC-based THz generation approach is a significant step towards fully integrated, cost-effective, and energy-efficient THz transmitters.
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