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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 15 — Jul. 16, 2012
  • pp: 17214–17219

Dynamic range improvement strategy for Mach-Zehnder modulators in microwave/millimeter-wave ROF links

Guoqiang Zhang, Shangyuan Li, Xiaoping Zheng, Hanyi Zhang, Bingkun Zhou, and Peng Xiang  »View Author Affiliations


Optics Express, Vol. 20, Issue 15, pp. 17214-17219 (2012)
http://dx.doi.org/10.1364/OE.20.017214


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Abstract

Intermodulation distortions are generated by Mach-Zehnder modulators when they are driven by signals with certain bandwidth in microwave (MW) and millimeter-wave (MMW) radio-over-fiber (ROF) links. The optical spectral structure of the distorted optical signal is investigated. A strategy to improve the dynamic range of MW and MMW ROF links directly in the optical domain is proposed and experimentally demonstrated. Based on optical spectrum processing, the third-order intermodulation distortions (IMD3s) of the generated signals are suppressed. A 107.2dB∙Hz2/3 spurious-free dynamic range (SFDR) of the MW/MMW ROF link is obtained, which is improved more than 20dB. A 16QAM signal is transmitted in the system and the error vector magnitude (EVM) is measured with and without the proposed technique. The influence of the nonlinearity of modulators on EVM is almost completely eliminated.

© 2012 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(230.4110) Optical devices : Modulators
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: May 29, 2012
Revised Manuscript: July 7, 2012
Manuscript Accepted: July 10, 2012
Published: July 12, 2012

Citation
Guoqiang Zhang, Shangyuan Li, Xiaoping Zheng, Hanyi Zhang, Bingkun Zhou, and Peng Xiang, "Dynamic range improvement strategy for Mach-Zehnder modulators in microwave/millimeter-wave ROF links," Opt. Express 20, 17214-17219 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-15-17214


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References

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