Abstract

A phase-preserving and spectrally efficient slow-light scheme has been proposed and demonstrated by utilizing advanced multilevel phase-modulated formats. A 60ps symbol delay with error-free demodulation of both I and Q channels for 10Gbits return-to-zero differential-quadrature-phase-shift-keyed (DQPSK) signals via a broadband stimulated Brillouin scattering-based slow-light medium is achieved experimentally. Simulation results on 20Gbits DQPSK and 30Gbits D8PSK propose to transmit very high spectrally efficient multilevel formats through a bandwidth-limited slow-light element.

© 2007 Optical Society of America

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