High-speed optical DQPSK and FSK modulation using integrated Mach-Zehnder interferometers

Tetsuya Kawanishi*, Takahide Sakamoto, Tetsuya Miyazaki, Masayuki Izutsu, Takahisa Fujita, Shingo Mori, Kaoru Higuma, Junichiro Ichikawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)


We investigated an integrated optical modulator consisting of two Mach-Zehnder interferometers. The modulator can generate optical signals in various types of modulation formats, which have advantages for long-haul transmission, optical labeling, etc. By using a fabricated versatile optical modulator having traveling-wave electrodes designed for high-speed signals, we demonstrated generation of optical 40 Gb/s frequency-shift-keying signals, which can be demodulated by an optical filter. 80 Gb/s optical differential quadrature-shift-keying modulation was also demonstrated, where 40 Gb/s in-phase and quadrature data were, simultaneously, fed to the modulator.

Original languageEnglish
Pages (from-to)4469-4478
Number of pages10
JournalOptics Express
Issue number10
Publication statusPublished - 2006 May
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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