Generation of arbitrarily patterned pulse trains in the THz range by spectral synthesis of optical combs

Isao Morohashi, Takahide Sakamoto, Norihiko Sekine, Tetsuya Kawanishi, Akifumi Kasamatsu, Iwao Hosako

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We demonstrated generation of arbitrarily patterned optical pulse trains and frequency tunable terahertz (THz) pulses by spectral synthesis of optical combs generated by a Mach-Zehnder-modulator-based flat comb generator (MZ-FCG). In our approach, THz pulses were generated by photomixing of a multi-tone signal, which is elongated pulse train, and a single-tone signal. Both signals were extracted from a comb signal by using optical tunable band-pass filters. In the case of optical pulse train generation, the MZ-FCG generated comb signals with 10 GHz-spacing and 330 GHz-width, which was converted to a 2.85 ps-width pulse train by chirp compensation using a single-mode fiber. By combining the MZ-FCG with a pulse picker composed of a 40 Gbps intensity modulator, divided pulse trains and arbitrarily bit sequences were successfully generated. The single-mode light was extracted by an optical bandpass filter and the band-controlled pulse train was extracted by an optical bandpass filter. By photomixing them, a THz pulse was successfully generated. In the case of THz pulse generation, by photomixing a single-tone and a multi-tone signals extracted by tunable bandpass filters, THz pulses with a center frequency of 300 GHz was successfully generated. Furthermore, frequency tunability of the center frequency was also demonstrated.

Original languageEnglish
Pages (from-to)793-798
Number of pages6
JournalIEICE Transactions on Electronics
Issue number8
Publication statusPublished - 2015 Aug 1
Externally publishedYes


  • Mach-Zehnder modulator
  • Optical comb
  • Terahertz
  • Ultra-wideband

ASJC Scopus subject areas

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


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