Nonlinearity of Semiconductor Mach-Zehnder Modulator for Flat Optical Frequency Comb

Nobuhide Yokota, Takahiro Miki, Koichiro Abe, Hiroshi Yasaka

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Optical frequency combs (OFCs) generated by an InP-based semiconductor Mach-Zehnder modulator (MZM) are numerically investigated. Nonlinear phase modulation induced by drive voltages applied to the MZM prove to be useful in obtaining a flat OFC. The experimentally measured intensity deviations of OFCs reported previously are quantitatively reproduced using a numerical model considering nonlinear change of refractive index and optical absorption induced by the drive voltages applied to the MZM. It is found that such nonlinearities generate a flat nine-channel (9-ch) OFC with an intensity deviation of <1 dB when a moderate RF drive voltage of <5 V is used. This flat 9-ch OFC is sustained regardless of the ratio of RF drive voltages of two arms in the MZM. Conversion efficiency is reasonably high (27%), but it is decreased by optical absorption and extinction losses in the MZM.

Original languageEnglish
Article number7160714
Pages (from-to)2219-2221
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number21
Publication statusPublished - 2015 Nov 1


  • Mach-Zehnder modulator
  • nonlinear phase modulation
  • optical frequency comb
  • sideband generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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