90 Gbaud NRZ-DP-DQPSK Modulation with Full-ETDM Technique Using High-Speed Optical IQ Modulator

Atsushi KANNO  Takahide SAKAMOTO  Akito CHIBA  Masaaki SUDO  Kaoru HIGUMA  Junichiro ICHIKAWA  Tetsuya KAWANISHI  

IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.7   pp.1179-1186
Publication Date: 2011/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.1179
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Ti:LiNbO3 optical modulator,  optical IQ modulator,  quadrature phase shift keying,  electrically time-division multiplexing,  

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We demonstrate high baud-rate DQPSK modulation with full-ETDM technique using a novel high-speed optical IQ modulator consisting of a ridge-type optical waveguide structure on a thin LiNbO3 substrate. Our fabrication technique achieves a drastic extension of the modulator's bandwidth and a reduction of half-wave voltage. Demonstration of 90-Gbaud NRZ-DP-DQPSK signal generation with the modulator successfully achieved a bit rate of 360-Gb/s under full-ETDM configuration.