Optical Review

, Volume 25, Issue 2, pp 264–270 | Cite as

Ultraflat and broadband optical frequency comb generator based on cascaded two dual-electrode Mach–Zehnder modulators

  • Kun Qu
  • Shanghong Zhao
  • Xuan Li
  • Qinggui Tan
  • Zihang Zhu
Regular Paper


A novel scheme for the generation of ultraflat and broadband optical frequency comb (OFC) is proposed based on cascaded two dual-electrode Mach–Zehnder modulators (DE-MZM). The first DE-MZM can generate a four-comb-line OFC, then the OFC is injected into the second DE-MZM as a carrier, which can increase the number of comb lines. Our modified scheme finally can generate a broadband OFC with high flatness by simply modifying the electrical power and the bias voltage of the DE-MZM. Theoretical analysis and simulation results reveal that a 16-comb-line OFC with a frequency spacing that two times the frequency of the RF signal can be obtained. The power fluctuation of the OFC lines is 0.48 dB and the unwanted-mode suppression ratio (UMSR) can reach 16.5 dB. Additionally, whether the bias drift of the DE-MZMs has little influence on the power fluctuation is also analyzed. These results demonstrate the robustness of our scheme and verify its good accuracy and high stability with perfect flatness.


Optical frequency comb (OFC) Dual-electrode Mach–Zehnder modulator Low power fluctuation Microwave photonics 



This research was supported by the National Natural Science Foundation of China (Nos. 61231012 and 61401502).


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Copyright information

© The Optical Society of Japan 2018

Authors and Affiliations

  • Kun Qu
    • 1
  • Shanghong Zhao
    • 1
  • Xuan Li
    • 1
  • Qinggui Tan
    • 2
  • Zihang Zhu
    • 1
  1. 1.Air Force Engineering UniversityXi’anChina
  2. 2.China Academy of Space TechnologyXi’anChina

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