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학술지 Cost-effective photonics-based THz wireless delivery system using a directly modulated DFB-LD
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저자
김언상, 문상록, 성민규, 이한협, 이준기, 조승현
발행일
202108
출처
Optics Communications, v.492, pp.1-6
ISSN
0030-4018
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.optcom.2021.126969
협약과제
21ZH1100, 연결의 한계를 극복하는 초연결 입체통신 기술 연구, 변우진
초록
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 (3.4×10 ). ?닋3
키워드
Directly modulated laser (DML), Laser-to-filter detuning effect, Optical communication, Terahertz communication
KSP 제안 키워드
25 Gbps, Bit Error Rate(And BER), Bit Error Rate performance, Carrier frequency optimization, Detuning effect, Directly modulated laser(DML), Distributed feedback laser diode, Distributed feedback lasers(DFBs), Forward error correction(FEC), Free Space, HD-FEC