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We demonstrate a carrier-injection silicon Mach-Zehnder optical modulator with high optical bandwidth by adopting two symmetric arms. The dynamic extinction ratio at the speed of 12.5 Gb/s is 7.0 ∼ 8.9 dB in the wavelength range from 1525 nm to 1565 nm. The phase shifter is only 100 µm and the figure of merit Vπ·L is 0.0155 V·cm.
We present a method to simultaneously realize phase-matching and reduce the effective carrier lifetime in the Si waveguide, with which -2.6-dB conversion efficiency and 300-nm conversion bandwidth are achieved in a properly designed Si waveguide.
A four-channel thermally-tuning reconfigurable optical add-drop multiplexer based on silicon photonic wire is reported. The minimum insertion loss is 10.7 dB, the tuning bandwidth 17 nm and the tuning power efficiency 6.187 mW/nm.
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