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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Experimental demonstration of uncompressed 4K video transmission over directly modulated distributed feedback laser-based terahertz wireless link

  • Eon-Sang Kim (Electronics and Telecommunications Research Institute) ;
  • Sang-Rok Moon (Electronics and Telecommunications Research Institute) ;
  • Minkyu Sung (Electronics and Telecommunications Research Institute) ;
  • Joon Ki Lee (Electronics and Telecommunications Research Institute) ;
  • Seung-Hyun Cho (Electronics and Telecommunications Research Institute)
  • Received : 2022.01.21
  • Accepted : 2022.08.07
  • Published : 2023.04.20
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Abstract

We demonstrate the transmission of uncompressed 4K videos over the photonics-based terahertz (THz) wireless link using a directly modulated distributed feedback laser diode (DFB-LD). For optical heterodyne mixing and data modulation, a DFB-LD was employed and directly modulated with a 5.94-Gb/s non-return-to-zero signal, which is related to a 6G-serial digital interface standard to support ultra-high-definition video resolution. We derived the optimal frequency of the THz carrier by varying the wavelength difference between DFB-LD output and Tunable LD output in the THz signal transmitter to obtain the best transmission performances of the uncompressed 4K video signals. Furthermore, we exploited the negative laser-to-filter detuning for the adiabatic chirp management of the DFB-LD by the intentional discrepancy between the center wavelength of the optical band-pass filter and the output wavelength of the DFB-LD. With the help of the abovementioned methods, we successfully transmitted uncompressed 4K video signals over the 2.3-m wireless transmission distance without black frames induced by time synchronization error.

Keywords

Acknowledgement

This research was supported by Electronics and Telecommunications Research Institute, a South Korean grant funded by the Korean government [22ZH1100, Study on 3D communication technology for hyper-connectivity].

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