ETRI Journal

  • 제38권2호
  • /
  • Pages.227-234
  • /
  • 2016
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  • 1225-6463(pISSN)
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  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
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Clipping Distortion Suppression of Directly Modulated Multi-IF-over-Fiber Mobile Fronthaul Links Using Shunt Diode Predistorter

  • Han, Changyo (Hyper-connected Communication Research Laboratory, ETRI) ;
  • Cho, Seung-Hyun (Hyper-connected Communication Research Laboratory, ETRI) ;
  • Sung, Minkyu (Hyper-connected Communication Research Laboratory, ETRI) ;
  • Chung, Hwan Seok (Hyper-connected Communication Research Laboratory, ETRI) ;
  • Lee, Jong Hyun (Hyper-connected Communication Research Laboratory, ETRI)
  • 투고 : 2015.08.17
  • 심사 : 2016.03.02
  • 발행 : 2016.04.01
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초록

Herein, we demonstrate clipping distortion suppression of directly modulated multi-IF-over-fiber links using a simple shunt diode predistorter. The dynamic range of a directly modulated analog fiber optic link is limited by nonlinear distortions caused by laser-diode clipping. We investigate the link performance in the context of carrie-to-noise and distortion ratio (CNDR) and error vector magnitude (EVM) requirements when supporting LTE-A services. We also design an analog predistorter with a shunt-diode structure, and demonstrate experimentally that the predistorter has the ability to suppress clipping-induced third-order intermodulation distortions of the link by at most 14 dB. It also improves the CNDR and EVM of the 4-IF-multiplexed LTE-A carriers by 7 dB and 2.9%, respectively.

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참고문헌

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