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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 17641–17646

Digital predistortion for RSOAs as external modulators in radio over fiber systems

Zhansheng Liu, Manuel Alberto Violas, and Nuno Borges Carvalho  »View Author Affiliations

Optics Express, Vol. 19, Issue 18, pp. 17641-17646 (2011)

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Reflective semiconductor optical amplifiers (RSOAs) can be used as external modulators in radio over fiber (RoF) links due to their amplification and modulation characteristics and colorless property. The nonlinear distortion of RSOA, however, limits its dynamic range. In this paper we demonstrate digital predistortion (DPD) linearization techniques to improve the linearity of RSOA external modulators. 64 quadrature amplitude modulation (QAM) signals are utilized to extract the model parameters. The dynamic AM/AM and AM/PM characteristics and power spectral densities of the modulated signals from the RSOA are demonstrated without and with DPD. Experimental results show clearly that the nonlinear distortion of RSOA external modulators in RoF links can be compensated using DPD linearization techniques.

© 2011 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(230.4110) Optical devices : Modulators
(250.5980) Optoelectronics : Semiconductor optical amplifiers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 30, 2011
Revised Manuscript: August 4, 2011
Manuscript Accepted: August 13, 2011
Published: August 23, 2011

Zhansheng Liu, Manuel Alberto Violas, and Nuno Borges Carvalho, "Digital predistortion for RSOAs as external modulators in radio over fiber systems," Opt. Express 19, 17641-17646 (2011)

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