Generation of millimeter waves with fine frequency tunability using Mach-Zehnder-modulator-based flat comb generator

Isao Morohashi*, Yoshihisa Irimajiri, Takahide Sakamoto, Tetsuya Kawanishi, Motoaki Yasui, Iwao Hosako

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We propose a method of the precise frequency tuning in millimeter wave (MMW) generation using a Mach-Zehnder-modulator-based flat comb generator (MZ-FCG). The MZ-FCG generates a flat comb signal where the comb spacing is exactly the same as the frequency of a radio-frequency signal driving the MZ-FCG. Two modes are extracted from the comb signal by using optical filters. One of them was modulated by a phase modulator, creating precisely frequency-controllable sidebands. In the experiment, typical phase modulation was used. By photomixing of the extracted two modes using a high-speed photodiode, MMW signals with precisely frequency-controllable sidebands are generated. By changing the modulation frequency, the frequency of MMW signals can be continuously tuned. In this scheme, there are two methods for the frequency tuning of MMW signals; one is a coarse adjustment which corresponds to the comb spacing, and the other is fine tuning by the phase-modulation. It was demonstrated that the intensity fluctuation of the upper sideband of the modulated MMW signal was less than 1 dB, and the frequency fluctuation was less than the measurement resolution (300 Hz).

Original languageEnglish
Pages (from-to)192-196
Number of pages5
JournalIEICE Transactions on Electronics
Issue number2
Publication statusPublished - 2013 Feb
Externally publishedYes


  • Mach-Zehnder modulator
  • Millimeter wave
  • Optical comb
  • Photomixing
  • Terahertz wave

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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