title: Dual-carrier IQ modulator with a complementary frequency shifter.
abstract: We devised a dual-carrier IQ modulator consisting of a novel complementary frequency shifter (CFS) and two IQ modulators. The CFS generates two optical subcarriers from a single light source and outputs them from separate ports without using any optical demultiplexing filters. We fabricated the modulator in a hybrid configuration of silica planar lightwave circuits and a LiNbO(3) phase-modulator array. Frequency-spacing-tunable operation of the CFS was demonstrated. With the modulator, we successfully generated a 100-Gb/s/pol dual-carrier OFDM-QPSK signal.
authors.affiliation: NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198 Japan. yamazaki.hiroshi@lab.ntt.co.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamazaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Saida
authors.forename: Takashi
authors.initials: T
authors.lastname: Goh
authors.forename: Atsushi
authors.initials: A
authors.lastname: Mori
authors.forename: Shinji
authors.initials: S
authors.lastname: Mino