Journal of Infrared, Millimeter, and Terahertz Waves

, Volume 30, Issue 7, pp 770-779

First online:

Impact of Mach-Zehnder Modulator Chirp on Radio over Fiber Links

  • Xiaogang ChenAffiliated withCollege of Science, China Three Gorges University Email author 
  • , Shengqin FengAffiliated withCollege of Science, China Three Gorges University
  • , Dexiu HuangAffiliated withWuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology

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The impact of Mach-Zehnder modulator (MZM) chirp on single sideband (SSB) and carrier suppressed double sideband (CS-DSB) modulation radio over fiber (RoF) links are investigated and simulated. Finite extinction ratio and drive signal unbalanced ratio of non-ideal MZM are considered, power variation of target microwave signal and harmonic suppression are calculated and evaluated. Our results suggest that unbalanced ratio could be optimized to minimized the power variation owing to the finite extinction ratio and improve the harmonic suppress ratio in the two kinds of RoF links. However, harmonic suppression ratio declined rapidly with the decrease of extinction ratio in the CS-DSB RoF link. For a non-ideal modulator with low extinction ratio, high quality microwave signal could be obtained in the SSB RoF link while an additional filter is required to suppress the unwanted harmonic components in the CS-DSB RoF link.


Microwave photonics Radio over fiber Mach-Zehnder modulator Chirp modulation