title: Reconfigurable multilevel transmitter using monolithically integrated quad Mach-Zehnder IQ modulator for optical 16-QAM and 8-PSK generation.
abstract: We propose and demonstrate a reconfigurable multilevel transmitter using a monolithically-integrated quad Mach-Zehnder in-phase/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.
authors: National Institute of Information and Communication Technology (NICT), Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan. gwlu@nict.go.jp
authors: Guo-Wei
authors: GW
authors: Lu
authors: Takahide
authors: T
authors: Sakamoto
authors: Akito
authors: A
authors: Chiba
authors: Tetsuya
authors: T
authors: Kawanishi
authors: Tetsuya
authors: T
authors: Miyazaki
authors: Kaoru
authors: K
authors: Higuma
authors: Masaaki
authors: M
authors: Sudo
authors: Junichiro
authors: J
authors: Ichikawa