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

Research output: Contribution to journalArticle

59 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


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Kawanishi, T., Sakamoto, T., Miyazaki, T., Izutsu, M., Fujita, T., Mori, S., Higuma, K., & Ichikawa, J. (2006). High-speed optical DQPSK and FSK modulation using integrated Mach-Zehnder interferometers. Optics Express, 14(10), 4469-4478. https://doi.org/10.1364/OE.14.004469