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We report a high-linearity wideband dual-parallel silicon Mach-Zehnder modulator (MZM). This modulator consists of two carrier-depletion-based MZMs with a single-drive push-pull traveling wave electrode configuration. An analytic model is established to investigate the linearity property of the modulator. The measurement results show the modulator can effectively suppress third-order harmonics and third-order intermodulation distortions, with improved modulation linearity, compared to a single MZM.