Reconfigurable multilevel transmitter using monolithically integrated quad Mach-Zehnder IQ modulator for optical 16-QAM and 8-PSK generation

Guo Wei Lu, Takahide Sakamoto, Akito Chiba, Tetsuya Kawanishi, Tetsuya Miyazaki, Kaoru Higuma, Masaaki Sudo, Junichiro Ichikawa

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8 Citations (Scopus)


We propose and demonstrate a reconfigurable multilevel transmitter using a monolithically-integrated quad Mach-Zehnder inphase/quadrature (QMZ-IQ) modulator with binary driving electronics. Different from previous parallel-integrated quadrature amplitude modulation (QAM) transmitter solutions, only one electrode is required to adjust the relative phase offset among embedded sub-Mach-Zehnder modulators in the proposed IQ superstructure. By feeding different RF driving electronics and operating the integrated modulator as different bias conditions, different advanced multilevel modulation formats, such as QAM and 8-ary phase-shift keying (8-PSK), could be synthesized. In this paper, a 40-Gb/s 16-QAM and a 30-Gb/s 8-PSK are generated using the proposed multilevel transmitter, respectively. Offline digital processing is employed for bit-error rates estimation and constellation reconstruction.

Original languageEnglish
Pages (from-to)5596-5601
Number of pages6
JournalOptics Express
Issue number6
Publication statusPublished - 2011 Mar 14


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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