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Journal Article
Clipping Distortion Suppression of Directly Modulated Multi-IF-over-Fiber Mobile Fronthaul Links Using Shunt Diode Predistorter
- Authors
- Changyo Han, Seung-Hyun Cho, Minkyu Sung, Hwan Seok Chung, Jong Hyun Lee
- Issue Date
- 2016-04
- Citation
- ETRI Journal, v.38, no.2, pp.227-234
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- 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 carrierto- 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 clippinginduced 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.
- KSP Keywords
- Clipping Distortion, Directly modulated, Distortion ratio, Fiber optic link, Intermodulation Distortion, Link Performance, Long Term Evolution - Advanced(LTE-A), Mobile fronthaul, Nonlinear Distortion, analog predistorter(APD), dynamic range