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A high-speed silicon modulator with broad optical bandwidth is proposed based on a symmetrically configured Mach-Zehnder interferometer. Careful phase bias control and traveling-wave design are used to improve the high-speed performance. Over a broadband wavelength range, high-speed operation up to 30 Gbit/s with a 4.5 dB-5.5 dB extinction ratio is experimentally demonstrated with a low driving voltage of 3 V.
Zhang et al. (Fri,) studied this question.