Since carrier dispersion and carrier absorption exist at the same time when the phase shifter is under phase modulation, decrease in extinction ratio is inevitable for silicon-based MZI modulator based plasma dispersion effect. In this paper, we demonstrate an optical modulator at 1550 nm wavelength band, using a cascaded compensation method. We balance the optical intensity in the two phase shifters of the MZI structure during modulation. With cascaded compensation method, the modulator has an extinction ratio of 51 dB and a dynamic extinction ratio of 10 dB at bitrates of 40 Gb/s.
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