Cost-effective photonics-based THz wireless delivery system using a directly modulated DFB-LD

OPTICS COMMUNICATIONS

卷:492

Article

Kim, Eon-sang¹  Moon, Sang-rok¹  Sung, Minkyu¹  Lee, Han Hyub¹  Lee, Joon Ki¹  Cho, Seung-hyun¹ 

[1] Elect & Telecommun Res Inst, Opt Network Res Sect, 218 Gajeong Ro, Daejeon 34129, South Korea

关键词: Terahertz communication;    Optical communication;    Directly modulated laser (DML);    Laser-to-filter detuning effect;   

DOI  :  10.1016/j.optcom.2021.126969

来源: Elsevier

【 摘 要 】

We present a cost-effective photonics-based THz wireless delivery system using a directly modulated distributed feedback laser diode (DFB-LD). A DFB-LD with non-return to zero (NRZ) modulation up to 25 Gbps and a uni-traveling-carrier photodiode (UTC-PD) with a horn antenna is employed to transmit a THz wave into free space in the photonics-based THz signal transmitter. A Schottky barrier diode (SBD) with a horn antenna is used to directly detect the THz wave from free space at the THz signal receiver. To achieve the best bit error rate performance, we varied the optimal THz carrier frequency in a photonics-based THz wireless delivery system. After THz carrier frequency optimization, bit error rates were measured by varying THz link operating conditions, such as the data rate, photocurrent of UTC-PD, and wireless transmission distance. We successfully transmitted a 25 Gb/s NRZ signal over 1.6 and 2.2 m wireless transmission distances before and after managing the adiabatic chirp characteristic of directly modulated DFB-LD using the laser-to-filter detuning effect, respectively, while satisfying the 7% hard decision-forward error correction (HD-FEC) threshold (3.4x10(-3)).

【 授权许可】

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