We show that a Gaussian-shaped vestigial-sideband (VSB) return-to-zero (RZ) on–off-keying (OOK) optical signal is essentially a RZ OOK signal with π/2 progressive phase shift. The reduced intersymbol interference of the VSB signal can be explained as a destructive interference effect. We experimentally demonstrate a method for generating an effective 40-Gbit/s VSB signal without relying on the detuning of an optical filter.
© 2004 Optical Society of America
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.5060) Fiber optics and optical communications : Phase modulation
Xing Wei and Juerg Leuthold, "Relation between vestigial-sideband filtering and π/2 progressive phase shift," Opt. Lett. 29, 1599-1601 (2004)