Open AccessHigh-speed optical DQPSK and FSK modulation using integrated Mach-Zehnder interferometers
Author(s) -
Tetsuya Kawanishi,
Takahide Sakamoto,
Tetsuya Miyazaki,
Masayuki Izutsu,
Takahisa Fujita,
Satoshi Mori,
Kaoru Higuma,
Junichiro Ichikawa
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.004469
Subject(s) - phase shift keying , optics , modulation (music) , frequency shift keying , electro optic modulator , phase modulation , quadrature amplitude modulation , optical modulation amplitude , keying , mach–zehnder interferometer , optical filter , physics , astronomical interferometer , optical modulator , optical amplifier , interferometry , telecommunications , bit error rate , phase noise , computer science , demodulation , acoustics , laser , channel (broadcasting)
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 40Gb/s frequency-shift-keying signals, which can be demodulated by an optical filter. 80Gb/s optical differential quadrature-shift-keying modulation was also demonstrated, where 40Gb/s in-phase and quadrature data were, simultaneously, fed to the modulator.