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학술지 Investigation of Transmission Performance in Multi-IFoF based Mobile Fronthaul with Dispersion-induced Intermixing Noise Mitigation
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성민규, 조승현, 정환석, 김선미, 이종현
Optics Express, v.25 no.8, pp.9346-9357
Optical Society of America(OSA)
17MH1300, 5G 이동통신을 위한 아날로그 IFoF기반 Indoor DAS 기술 개발, 이종현
We demonstrate the improvement of the transmission performance based on intermixing noise mitigation techniques in a multiple intermediate-frequency-over-fiber (IFoF) based mobile fronthaul. The interaction between fiber chromatic dispersion and frequency chirp of the directly modulated laser generates the second-order distortion that degrades the performance of multi-IFoF transmission system. To avoid second-order distortion, we use intermediate frequency (IF) spacing optimization and octave-confined frequency plan schemes in which intermixing noise would be generated in the out of signal band and would not affect the quality of transmitted signal. For bandwidth efficient transmission of radio signal over mobile fronthaul link, we employ the dispersion compensation technique to suppress the intermixing noise sufficiently. For realization of the multi-IFoF based mobile fronthaul, we experimentally investigate the transmission performances of 48-, 72- and 144-IF carriers of the long term evolution-advanced (LTE-A) signals mapped with 64-quadrature amplitude modulation (QAM). It is clearly observed that the intermixing noise is suppressed owing to dispersion compensation technique and overall system performances are improved by IF spacing optimization and octave-confined frequency plan. As a result, we successfully transmit 144-IF carriers of the LTE-A signal with less than 8% error vector magnitude (EVM) over 20-km single-mode fiber (SMF) within only 3 GHz bandwidth.
KSP 제안 키워드
Bandwidth efficient, Chromatic dispersion(CD), Directly modulated laser(DML), Dispersion compensation, Fiber chromatic dispersion, Long term Evolution(LTE), Long term evolution-advanced(LTE-A), Mobile fronthaul, Overall system, Quadrature-amplitude modulation(QAM), Radio Signal